Sign In | Join Free | My brakesband.com
China Shenzhen Wisdomlong Technology CO.,LTD logo
Shenzhen Wisdomlong Technology CO.,LTD
Shenzhen Wisdomlong Technology CO.,LTD Work hard and best service for you!
Verified Supplier

7 Years

Home > Industrial Servo Motor >

Yaskawa Electric Servo Motor 4.77N.m Motors-AC Servo SGMP-15A3A4EPU 3000RMP

Shenzhen Wisdomlong Technology CO.,LTD
Trust Seal
Verified Supplier
Credit Check
Supplier Assessment

Yaskawa Electric Servo Motor 4.77N.m Motors-AC Servo SGMP-15A3A4EPU 3000RMP

  • 1
  • 2

Brand Name : Yaskawa

Model Number : SGMP-15A3A4EPU

Place of Origin : Japan

MOQ : 1

Price : negotiable

Payment Terms : T/T, Western Union

Supply Ability : 100

Delivery Time : 2-3 work days

Packaging Details : New in original box

Brand : Yaskawa

Model : SGMP-15A3A4EPU

Type : AC SERVO MOTOR

Power : 750W

Volatge : 200V

Current : 7.5A

Ins : B

Contact Now

Yaskawa Electric Servo Motor 4.77N.m Motors-AC Servo SGMP-15A3A4EPU 3000RMP



Quick Details

Place of Origin:

Japan, Japan

Brand Name:

Yaskawa

Model Number:

SGMP-15A3A4EPU

Usage:

Electric Bicycle

Certification:

UL

Type:

Servo Motor, Servo Motor

Construction:

Permanent Magnet

Commutation:

Brush

Protect Feature:

Drip-proof

Speed(RPM):

3000RMP

Continuous Current(A):

7.5A

Efficiency:

IE 1

Brand:

WTL

Model:

SGMP-15A3A4EPU

Power:

750W

Voltage:

200V

Current:

7.5A

Options:

With Brake

Series:

SGMP








OTHER SUPERIOR PRODUCTS

Yasakawa Motor, Driver SG- Mitsubishi Motor HC-,HA-
Westinghouse Modules 1C-,5X- Emerson VE-,KJ-
Honeywell TC-,TK- GE Modules IC -
Fanuc motor A0- Yokogawa transmitter EJA-
Contact person: Anna
E-mail: wisdomlongkeji@163.com
Cellphone: +0086-13534205279





SIMILAR PRODUCTS

SGMP-01U312 SGMP01U312 SERVO MOTOR yaskawa
SGMP-01U314CM SGMP01U314CM SERVO MOTOR yaskawa
SGMP-01U314EM SGMP01U314EM SERVO MOTOR yaskawa
SGMP-01U314M SGMP01U314M SERVO MOTOR yaskawa
SGMP-01U3AP08 SGMP01U3AP08 SERVO MOTOR yaskawa
SGMP-01U3G46 SGMP01U3G46 SERVO MOTOR yaskawa
SGMP-01U3S SGMP01U3S SERVO MOTOR yaskawa
SGMP-02A312 SGMP02A312 SERVO MOTOR yaskawa
SGMP-02A314 SGMP02A314 SERVO MOTOR yaskawa
SGMP-02A3G26C SGMP02A3G26C SERVO MOTOR yaskawa
SGMP-02A3HA12 SGMP02A3HA12 SERVO MOTOR yaskawa
SGMP-02A3TE21 SGMP02A3TE21 SERVO MOTOR yaskawa
SGMP-02A3TE33 SGMP02A3TE33 SERVO MOTOR yaskawa
SGMP-02A8YR11 SGMP02A8YR11 SERVO MOTOR yaskawa
SGMP-02A8YR21 SGMP02A8YR21 SERVO MOTOR yaskawa
SGMP-02AW12 SGMP02AW12 SERVO MOTOR yaskawa
SGMP-02AW14 SGMP02AW14 SERVO MOTOR yaskawa
SGMP-02AW16 SGMP02AW16 SERVO MOTOR yaskawa
SGMP-02AW16CM SGMP02AW16CM SERVO MOTOR yaskawa
SGMP-02AW16S SGMP02AW16S SERVO MOTOR yaskawa
SGMP-02Awg16b SGMP02Awg16b SERVO MOTOR yaskawa
SGMP-02AWYR11 SGMP02AWYR11 2AMP 200W 200V yaskawa
SGMP-02AWYR12 SGMP02AWYR12 2AMP 200V 200W 3000RPM 0.637NM yaskawa
SGMP-02AXSWX SGMP02AXSWX SERVO MOTOR yaskawa
SGMP-02B312 SGMP02B312 SERVO MOTOR yaskawa
SGMP-02B314 SGMP02B314 SERVO MOTOR yaskawa
SGMP-02B3G36 SGMP02B3G36 SERVO MOTOR yaskawa
SGMP-02B3J22 SGMP02B3J22 SERVO MOTOR yaskawa
SGMP-02BW12C SGMP02BW12C SERVO MOTOR yaskawa
SGMP-02U314CM SGMP02U314CM AC 200W 200VAC 2.0AMP yaskawa
SGMP-02U314M SGMP02U314M SERVO MOTOR yaskawa
SGMP-02U3YA11 SGMP02U3YA11 SERVO MOTOR yaskawa
SGMP-02V312B SGMP02V312B SERVO MOTOR yaskawa
SGMP-02V314T SGMP02V314T SERVO MOTOR yaskawa
SGMP-03B312 SGMP03B312 SERVO MOTOR yaskawa
SGMP-03B314 SGMP03B314 SERVO MOTOR yaskawa
SGMP-03L314M SGMP03L314M 100V 300W yaskawa
SGMP-04A312 SGMP04A312 SERVO MOTOR yaskawa
SGMP-04A314 SGMP04A314 SERVO MOTOR yaskawa
SGMP-04A3A4 SGMP04A3A4 SERVO MOTOR yaskawa
SGMP-04A3G32 SGMP04A3G32 SERVO MOTOR yaskawa
SGMP-04A3G40 SGMP04A3G40 SERVO MOTOR yaskawa
SGMP-04A3NA11 SGMP04A3NA11 SERVO MOTOR yaskawa
SGMP-04A3TE31 SGMP04A3TE31 SERVO MOTOR yaskawa
SGMP-04A3TE32 SGMP04A3TE32 SERVO MOTOR yaskawa
SGMP-04A3TE41 SGMP04A3TE41 SERVO MOTOR yaskawa
SGMP-04A3TE81 SGMP04A3TE81 SERVO MOTOR yaskawa
SGMP-04AW12 SGMP04AW12 SERVO MOTOR yaskawa
SGMP-04AW160 SGMP04AW160 SERVO MOTOR yaskawa
SGMP-04AW16S SGMP04AW16S SERVO MOTOR yaskawa
SGMP-04AWG10 SGMP04AWG10 SERVO MOTOR yaskawa
SGMP-04AWYR52 SGMP04AWYR52 SERVO MOTOR yaskawa
SGMP-04AWYR62 SGMP04AWYR62 SERVO MOTOR yaskawa
SGMP-04U314CM SGMP04U314CM 200VSERVO MOTOR yaskawa
SGMP-04U314M SGMP04U314M SERVO MOTOR yaskawa
SGMP-04U314SPT SGMP04U314SPT SERVO MOTOR yaskawa
SGMP-04U316C SGMP04U316C SERVO MOTOR yaskawa
SGMP-04U3AP10 SGMP04U3AP10 SERVO MOTOR yaskawa
SGMP-04UW14 SGMP04UW14 SERVO MOTOR yaskawa
SGMP-04UW16CM SGMP04UW16CM 400W 200V 2.6AMP yaskawa
SGMP-04V314T SGMP04V314T 200VAC 400W yaskawa
SGMP-04V314T#ZL02 SGMP04V314T#ZL02 SERVO MOTOR yaskawa
SGMP-04V316CT SGMP04V316CT SERVO MOTOR yaskawa
SGMP-04-V316CT SGMP04V316CT SERVO MOTOR yaskawa
SGMP-04V3D14T SGMP04V3D14T SERVO MOTOR yaskawa
SGMP-04V3YG11 SGMP04V3YG11 SERVO MOTOR yaskawa
SGMP-08A312 SGMP08A312 SERVO MOTOR yaskawa
SGMP-08A312b SGMP08A312b SERVO MOTOR yaskawa
SGMP-08A314 SGMP08A314 SERVO MOTOR yaskawa
SGMP-08A314B SGMP08A314B SERVO MOTOR yaskawa
SGMP-08A314C SGMP08A314C SERVO MOTOR yaskawa
SGMP-08A314S SGMP08A314S SERVO MOTOR yaskawa
SGMP-08A3G32 SGMP08A3G32 SERVO MOTOR yaskawa
SGMP-08A3te11 SGMP08A3te11 SERVO MOTOR yaskawa
SGMP-08A3TE12 SGMP08A3TE12 SERVO MOTOR yaskawa
SGMP-08A3TE21 SGMP08A3TE21 SERVO MOTOR yaskawa
SGMP-08A3TE22 SGMP08A3TE22 SERVO MOTOR yaskawa
SGMP-08A3TE31 SGMP08A3TE31 SERVO MOTOR yaskawa
SGMP-08A3TE51 SGMP08A3TE51 SERVO MOTOR yaskawa
SGMP-08AW12 SGMP08AW12 SERVO MOTOR yaskawa
SGMP-08AW14 SGMP08AW14 SERVO MOTOR yaskawa
SGMP-08AW16DP SGMP08AW16DP AC 750W 200V 4.1AMP yaskawa
SGMP-08AWG10 SGMP08AWG10 SERVO MOTOR yaskawa
SGMP-08AWHG22 SGMP08AWHG22 AC 200V 750W 4.1AMP 3000RPM yaskawa
SGMP-08AWYR11 SGMP08AWYR11 SERVO MOTOR yaskawa
SGMP-08AWYR12 SGMP08AWYR12 SERVO MOTOR yaskawa
SGMP-08AWYR32 SGMP08AWYR32 4.1AMP 750W 200V yaskawa
SGMP-08AWYR33 SGMP08AWYR33 4.2A 200V 3000RPM 750W 2.39NM yaskawa
SGMP-08AWYR41 SGMP08AWYR41 CUBE 1.01HP 200V EN STANDARD yaskawa
SGMP-08AWYR42 SGMP08AWYR42SERVO MOTOR yaskawa
SGMP-08TE31 SGMP08TE31 SERVO MOTOR yaskawa
SGMP-08U314M SGMP08U314M SERVO MOTOR yaskawa
SGMP-08Wyr12 SGMP08Wyr12 SERVO MOTOR yaskawa
SGMP-08WYR33 SGMP08WYR33 SERVO MOTOR yaskawa
SGMP-15A312 SGMP15A312 SERVO MOTOR yaskawa
SGMP-15A314 SGMP15A314 SERVO MOTOR yaskawa
SGMP-15A314M SGMP15A314M SERVO MOTOR yaskawa
SGMP-15A3A4EPU SGMP15A3A4EPU SERVO MOTOR yaskawa
SGMP-15A3G26BM SGMP15A3G26BM 7.5AMP 1500W 200V yaskawa
SGMP-15A3G26M SGMP15A3G26M SERVO MOTOR yaskawa
SGMP-15A3NT11 SGMP15A3NT11 SERVO MOTOR yaskawa
SGMP-15AW12SP SGMP15AW12SP SERVO MOTOR yaskawa
SGMP-15AWG12M SGMP15AWG12M SERVO MOTOR yaskawa
SGMP-15AWHG11 SGMP15AWHG11 SERVO MOTOR yaskawa
SGMP-15AWYR11 SGMP15AWYR11 1.5KW 200V 7.5AMP 4.77NM yaskawa
SGMP-15AWYR12 SGMP15AWYR12 AC 3KRPM 1500W 200V 7.5AMP yaskawa
SGMP-15U314 SGMP15U314 SERVO MOTOR yaskawa
SGMP-15V316C SGMP15V316C SERVO MOTOR yaskawa
SGMP-A8A3TA11 SGMPA8A3TA11 SERVO MOTOR yaskawa
SGMP-A8BW14B SGMPA8BW14B SERVO MOTOR yaskawa
SGMP-O1AWA4SPU SGMPO1AWA4SPU SERVO MOTOR yaskawa
SGMP-O2UW14M SGMPO2UW14M SERVO MOTOR yaskawa
SGMP-U20314M SGMPU20314M SERVO MOTOR yaskawa
SGMP-02W3026 SGMP02W3026 SERVO MOTOR yaskawa
SGMP-04AWYR31 SGMP04AWYR31 SERVO MOTOR yaskawa
SGMP-04AWYR32 SGMP04AWYR32 SERVO MOTOR yaskawa

Electric motors and generators

Electric motors, generators, alternators and loudspeakers are explained using animations and schematics.
This is a resource page from Physclips, a multi-level multimedia introduction to physics (download the animations on this page).

The schematics shown here are idealised, to make the principles obvious. For example, the animation at right has just one loop of wire, no bearings and a very simple geometry. Real motors use the same principles, but their geometry is usually complicated. If you already understand the basic principles of the various types of motors, you may want to go straight to the more complex and subtle cases described in How real electric motors work, by Prof John Storey.


DC motors

A simple DC motor has a coil of wire that can rotate in a magnetic field. The current in the coil is supplied via two brushes that make moving contact with a split ring. The coil lies in a steady magnetic field. The forces exerted on the current-carrying wires create a torque on the coil.

Yaskawa Electric Servo Motor 4.77N.m Motors-AC Servo SGMP-15A3A4EPU 3000RMP

The force F on a wire of length L carrying a current i in a magnetic field B is iLB times the sine of the angle between B and i, which would be 90° if the field were uniformly vertical. The direction of F comes from the right hand rule*, as shown here. The two forces shown here are equal and opposite, but they are displaced vertically, so they exert a torque. (The forces on the other two sides of the coil act along the same line and so exert no torque.)
  • * A number of different nmemonics are used to remember the direction of the force. Some use the right hand, some the left. For students who know vector multiplication, it is easy to use the Lorentz force directly: F = q v X B , whence F = i dL X B . That is the origin of the diagram shown here.
The coil can also be considered as a magnetic dipole, or a little electromagnet, as indicated by the arrow SN: curl the fingers of your right hand in the direction of the current, and your thumb is the North pole. In the sketch at right, the electromagnet formed by the coil of the rotor is represented as a permanent magnet, and the same torque (North attracts South) is seen to be that acting to align the central magnet.
  • Throughout, we use blue for the North pole and red for the South. This is just a convention to make the orientation clear: there is no difference in the material at either end of the magnet, and they are usually not painted a different colour.

Note the effect of the brushes on the split ring. When the plane of the rotating coil reaches horizontal, the brushes will break contact (not much is lost, because this is the point of zero torque anyway – the forces act inwards). The angular momentum of the coil carries it past this break point and the current then flows in the opposite direction, which reverses the magnetic dipole. So, after passing the break point, the rotor continues to turn anticlockwise and starts to align in the opposite direction. In the following text, I shall largely use the 'torque on a magnet' picture, but be aware that the use of brushes or of AC current can cause the poles of the electromagnet in question to swap position when the current changes direction.

The torque generated over a cycle varies with the vertical separation of the two forces. It therefore depends on the sine of the angle between the axis of the coil and field. However, because of the split ring, it is always in the same sense. The animation below shows its variation in time, and you can stop it at any stage and check the direction by applying the right hand rule.

Motors and generators

Now a DC motor is also a DC generator. Have a look at the next animation. The coil, split ring, brushes and magnet are exactly the same hardware as the motor above, but the coil is being turned, which generates an emf.

If you use mechanical energy to rotate the coil (N turns, area A) at uniform angular velocity ω in the magnetic field B, it will produce a sinusoidal emf in the coil. emf (an emf or electromotive force is almost the same thing as a voltage). Let θ be the angle between B and the normal to the coil, so the magnetic flux φ is NAB.cos θ. Faraday's law gives:

  • emf = − dφ/dt = − (d/dt) (NBA cos θ)

    = NBA sin θ (dθ/dt) = NBAω sin ωt.

The animation above would be called a DC generator. As in the DC motor, the ends of the coil connect to a split ring, whose two halves are contacted by the brushes. Note that the brushes and split ring 'rectify' the emf produced: the contacts are organised so that the current will always flow in the same direction, because when the coil turns past the dead spot, where the brushes meet the gap in the ring, the connections between the ends of the coil and external terminals are reversed. The emf here (neglecting the dead spot, which conveniently happens at zero volts) is |NBAω sin ωt|, as sketched.

An alternator

If we want AC, we don't need recification, so we don't need split rings. (This is good news, because the split rings cause sparks, ozone, radio interference and extra wear. If you want DC, it is often better to use an alternator and rectify with diodes.)

In the next animation, the two brushes contact two continuous rings, so the two external terminals are always connected to the same ends of the coil. The result is the unrectified, sinusoidal emf given by NBAω sin ωt, which is shown in the next animation.

This is an AC generator. The advantages of AC and DC generators are compared in a section below. We saw above that a DC motor is also a DC generator. Similarly, an alternator is also an AC motor. However, it is a rather inflexible one. (See How real electric motors work for more details.)

Back emf

Now, as the first two animations show, DC motors and generators may be the same thing. For example, the motors of trains become generators when the train is slowing down: they convert kinetic energy into electrical energy and put power back into the grid. Recently, a few manufacturers have begun making motor cars rationally. In such cars, the electric motors used to drive the car are also used to charge the batteries when the car is stopped - it is called regenerative braking.

So here is an interesting corollary. Every motor is a generator. This is true, in a sense, even when it functions as a motor. The emf that a motor generates is called the back emf. The back emf increases with the speed, because of Faraday's law. So, if the motor has no load, it turns very quickly and speeds up until the back emf, plus the voltage drop due to losses, equal the supply voltage. The back emf can be thought of as a 'regulator': it stops the motor turning infinitely quickly (thereby saving physicists some embarrassment). When the motor is loaded, then the phase of the voltage becomes closer to that of the current (it starts to look resistive) and this apparent resistance gives a voltage. So the back emf required is smaller, and the motor turns more slowly. (To add the back emf, which is inductive, to the resistive component, you need to add voltages that are out of phase. See AC circuits.)

Coils usually have cores

In practice, (and unlike the diagrams we have drawn), generators and DC motors often have a high permeability core inside the coil, so that large magnetic fields are produced by modest currents. This is shown at left in the figure below in which the stators (the magnets which are stat-ionary) are permanent magnets.

Yaskawa Electric Servo Motor 4.77N.m Motors-AC Servo SGMP-15A3A4EPU 3000RMP

'Universal' motors

The stator magnets, too, could be made as electromagnets, as is shown above at right. The two stators are wound in the same direction so as to give a field in the same direction and the rotor has a field which reverses twice per cycle because it is connected to brushes, which are omitted here. One advantage of having wound stators in a motor is that one can make a motor that runs on AC or DC, a so called universal motor. When you drive such a motor with AC, the current in the coil changes twice in each cycle (in addition to changes from the brushes), but the polarity of the stators changes at the same time, so these changes cancel out. (Unfortunatly, however, there are still brushes, even though I've hidden them in this sketch.) For advantages and disadvantages of permanent magnet versus wound stators, see below. Also see more on universal motors.

Build a simple motor

To build this simple but strange motor, you need two fairly strong magnets (rare earth magnets about 10 mm diameter would be fine, as would larger bar magnets), some stiff copper wire (at least 50 cm), two wires with crocodile clips on either end, a six volt lantern battery, two soft drink cans, two blocks of wood, some sticky tape and a sharp nail.

Yaskawa Electric Servo Motor 4.77N.m Motors-AC Servo SGMP-15A3A4EPU 3000RMP

Make the coil out of stiff copper wire, so it doesn't need any external support. Wind 5 to 20 turns in a circle about 20 mm in diameter, and have the two ends point radially outwards in opposite directions. These ends will be both the axle and the contacts. If the wire has lacquer or plastic insulation, strip it off at the ends.

The supports for the axle can be made of aluminium, so that they make electrical contact. For example poke holes in a soft drink cans with a nail as shown. Position the two magnets, north to south, so that the magnetic field passes through the coil at right angles to the axles. Tape or glue the magnets onto the wooden blocks (not shown in the diagram) to keep them at the right height, then move the blocks to put them in position, rather close to the coil. Rotate the coil initially so that the magnetic flux through the coil is zero, as shown in the diagram.

Now get a battery, and two wires with crocodile clips. Connect the two terminals of the battery to the two metal supports for the coil and it should turn.

Note that this motor has at least one 'dead spot': It often stops at the position where there is no torque on the coil. Don't leave it on too long: it will flatten the battery quickly.

The optimum number of turns in the coil depends on the internal resistance of the battery, the quality of the support contacts and the type of wire, so you should experiment with different values.

As mentioned above, this is also a generator, but it is a very inefficient one. To make a larger emf, use more turns (you may need to use finer wire and a frame upon which to wind it.) You could use eg an electric drill to turn it quickly, as shown in the sketch above. Use an oscilloscope to look at the emf generated. Is it AC or DC?

This motor has no split ring, so why does it work on DC? Simply put, if it were exactly symmetrical, it wouldn't work. However, if the current is slightly less in one half cycle than the other, then the average torque will not be zero and, because it spins reasonably rapidly, the angular momentum acquired during the half cycle with greater current carries it through the half cycle when the torque is in the opposite direction. At least two effects can cause an asymmetry. Even if the wires are perfectly stripped and the wires clean, the contact resistance is unlikely to be exactly equal, even at rest. Also, the rotation itself causes the contact to be intermittent so, if there are longer bounces during one phase, this asymmetry is sufficient. In principle, you could partially strip the wires in such a way that the current would be zero in one half cycle.

Yaskawa Electric Servo Motor 4.77N.m Motors-AC Servo SGMP-15A3A4EPU 3000RMP

An alternative relisation of the simple motor, by James Taylor.

An even simpler motor (one that is also much simpler to understand!) is the homopolar motor.

AC motors

With AC currents, we can reverse field directions without having to use brushes. This is good news, because we can avoid the arcing, the ozone production and the ohmic loss of energy that brushes can entail. Further, because brushes make contact between moving surfaces, they wear out.

The first thing to do in an AC motor is to create a rotating field. 'Ordinary' AC from a 2 or 3 pin socket is single phase AC--it has a single sinusoidal potential difference generated between only two wires--the active and neutral. (Note that the Earth wire doesn't carry a current except in the event of electrical faults.) With single phase AC, one can produce a rotating field by generating two currents that are out of phase using for example a capacitor. In the example shown, the two currents are 90° out of phase, so the vertical component of the magnetic field is sinusoidal, while the horizontal is cosusoidal, as shown. This gives a field rotating counterclockwise.

(* I've been asked to explain this: from simple AC theory, neither coils nor capacitors have the voltage in phase with the current. In a capacitor, the voltage is a maximum when the charge has finished flowing onto the capacitor, and is about to start flowing off. Thus the voltage is behind the current. In a purely inductive coil, the voltage drop is greatest when the current is changing most rapidly, which is also when the current is zero. The voltage (drop) is ahead of the current. In motor coils, the phase angle is rather less than 90¡, because electrical energy is being converted to mechanical energy.)

In this animation, the graphs show the variation in time of the currents in the vertical and horizontal coils. The plot of the field components Bx and By shows that the vector sum of these two fields is a rotating field. The main picture shows the rotating field. It also shows the polarity of the magnets: as above, blue represents a North pole and red a South pole.

If we put a permanent magnet in this area of rotating field, or if we put in a coil whose current always runs in the same direction, then this becomes a synchronous motor. Under a wide range of conditions, the motor will turn at the speed of the magnetic field. If we have a lot of stators, instead of just the two pairs shown here, then we could consider it as a stepper motor: each pulse moves the rotor on to the next pair of actuated poles. Please remember my warning about the idealised geometry: real stepper motors have dozens of poles and quite complicated geometries!

Induction motors

Now, since we have a time varying magnetic field, we can use the induced emf in a coil – or even just the eddy currents in a conductor – to make the rotor a magnet. That's right, once you have a rotating magnetic field, you can just put in a conductor and it turns. This gives several of the advantages of induction motors: no brushes or commutator means easier manufacture, no wear, no sparks, no ozone production and none of the energy loss associated with them. Below left is a schematic of an induction motor. (For photos of real induction motors and more details, see Induction motors.)

The animation at right represents a squirrel cage motor. The squirrel cage has (in this simplified geometry, anyhow!) two circular conductors joined by several straight bars. Any two bars and the arcs that join them form a coil – as indicated by the blue dashes in the animation. (Only two of the many possible circuits have been shown, for simplicity.)

This schematic suggests why they might be called squirrel cage motors. The reality is different: for photos and more details, see Induction motors. The problem with the induction and squirrel cage motors shown in this animation is that capacitors of high value and high voltage rating are expensive. One solution is the 'shaded pole' motor, but its rotating field has some directions where the torque is small, and it has a tendency to run backwards under some conditions. The neatest way to avoid this is to use multiple phase motors.

Three phase AC induction motors

Single phase is used in domestic applications for low power applications but it has some drawbacks. One is that it turns off 100 times per second (you don't notice that the fluorescent lights flicker at this speed because your eyes are too slow: even 25 pictures per second on the TV is fast enough to give the illusion of continuous motion.) The second is that it makes it awkward to produce rotating magnetic fields. For this reason, some high power (several kW) domestic devices may require three phase installation. Industrial applications use three phase extensively, and the three phase induction motor is a standard workhorse for high power applications. The three wires (not counting earth) carry three possible potential differences which are out of phase with each other by 120°, as shown in the animation below. Thus three stators give a smoothly rotating field. (See this link for more about three phase supply.)

If one puts a permanent magnet in such a set of stators, it becomes a synchronous three phase motor. The animation shows a squirrel cage, in which for simplicity only one of the many induced current loops is shown. With no mechanical load, it is turning virtually in phase with the rotating field. The rotor need not be a squirrel cage: in fact any conductor that will carry eddy currents will rotate, tending to follow the rotating field. This arrangement can give an induction motor capable of high efficiency, high power and high torques over a range of rotation rates.

Linear motors

A set of coils can be used to create a magnetic field that translates, rather than rotates. The pair of coils in the animation below are pulsed on, from left to right, so the region of magnetic field moves from left to right. A permanent or electromagnet will tend to follow the field. So would a simple slab of conducting material, because the eddy currents induced in it (not shown) comprise an electromagnet. Alternatively, we could say that, from Faraday's law, an emf in the metal slab is always induced so as to oppose any change in magnetic flux, and the forces on the currents driven by this emf keep the flux in the slab nearly constant. (Eddy currents not shown in this animation.)

Product Tags:

ewing machine servo motor

      

ac servo motor

      
Quality Yaskawa Electric Servo Motor 4.77N.m Motors-AC Servo SGMP-15A3A4EPU 3000RMP for sale

Yaskawa Electric Servo Motor 4.77N.m Motors-AC Servo SGMP-15A3A4EPU 3000RMP Images

Inquiry Cart 0
Send your message to this supplier
 
*From:
*To: Shenzhen Wisdomlong Technology CO.,LTD
*Subject:
*Message:
Characters Remaining: (0/3000)