Permanent magnet synchronous motor consists of stator and rotor.Stator is made up of three phase winding and stator core that is the same to normal ac asynchronous motor. Just the rotor is permanent magnetic rare earth material, Nd2Fe14B, that eliminates excitation loss.

How does permanent magnetic rotor makes synchronous speed? After permanentic rotor is put into stator core that generates rotating magetic filed, it will synchronously spin with spining magetic filed. And its speed is the same to magetic filed's. Following is just a graphic to show this:

Staring Mode: speial vector control VFD. Firstly frequency power supply( frequency inverter) suppliers power to permanent magnet synchronous motor, adjust the frequency power supply to slowly increase from 0, and rotating magetic filed speed aslo slowly increase from 0 unitl to the rated speed to make motor slow synchronously accelerate.

Recommended VFD driver: Mochuan MH300 series, Siemens 6ES70, Yaskawa CR5 series, Bosch Rexroth RD51 seres, ABB ACS800 series, Danfoss FC312 series, Mitsubishi A740 series, Delta C2000 series, B&R P84 and P74 series, etc.

High power factor and efficiency: permanent magnetic rotor eliminates exciting current on account of high magneti flux, desity that makes reactive current significantly reduce, working efficieny and power factor hugely increase therewith, Following is the energy effiieny comparision of PM-AW-112M4-4 in centrifugal fan.

Fast-Response and Strong Overload Capacity: PMSM motor's stator core can be designed hollow structure to redcue rotor inerita, and lessen starting and stopping time, Making use of IPM reluctance effect realize above 2 times overload capacity of asynchronous motor, Below shows torque charateristics:

Simpler Stator Struture is easy to maintain, and improves running stability, Below graphi is simple structure for reference:

Smaller Size and Lighter Weight: compared with asynshronous motor with same power, pmsm motor is smaller 1-2 stand with compact size.

IE4 Standard: PMSM motor meets European IE4 energy consumption standard, Its power factor an be up to 15% higher than Y series motor.

♥ VFD driven permanent magnet synchronous ac noninductive motor can not be sepertely used. 

♥ Permanent magnet synchronous motor is actually used as the fittings of VFD and its deuterogenic VFD. 

♥ The application of PMSM motor matching with special VFD is between VFD's and Sevo motor's, but is more inclined to VFD's. 

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1. Can pmsm motor be used as generator? 

No. Permanent magnet synchronous motor is absolutely different from generator. It is only ac motor that outputs speed and torque to drive electric devices, but not power supply. 

2. Why can not directly use three phase ac supply voltage to start pmsm motor? 

Becuase rotor is with big innertia, and magetic files spins so fast that static rotor has no way to spin with magetic filed. 

3. Any special technical request on pmsm motor's VFD driver? And Do you have such driver? 

Permanent magnet synchronous motor's driver should be vector control VFD with special inner software, such as Siemens 6SE70 series, Yakawa CR5 series, ABB ACS800 series, Mitsubishi A740 series, B&R P84 and P74 series, etc.. Yes, our MH300P series VFD matches with this motor. 

4. Is there any protective measures to defend permanent magnet rotor from failure? 

Yes, each permanent magnet rotor passes corrossion resistance, consistency, high temperature demagnetization test, linear demagnetization test, etc. Its demagnetization index is within 2%. But if working environment is serious oxiditive corrosion, kindly advise for higher protection level. 

5. Where is this pmsm motor normally used to? 

This permanent magnet synchronous motor is normally used to variable frequency speed situation.