Study on the electromagnetic vibration characteristics of permanent magnet synchronous motor under permanent magnet fault
Aiming at the influence of permanent magnet absence on electromagnetic vibration of permanent magnet synchronous motor,the distribution of magnetomotive force under the joint action of permanent magnet,fundamental wave of winding current and harmonic of winding current is firstly analyzed.The analytical analysis model of radial electromagnetic force under permanent magnet absence of motor is then established,and the electromagnetic force characteristics under both normal state and permanent magnet absence fault are ana-lyzed.Then,the co-simulation model of the motor and variable parameter vector control is built under permanent magnet absence fault,and the variation of three-phase current and ra-dial electromagnetic force characteristics of the motor without fault and with fault are simu-lated and validated,respectively.The results show that the amplitude of fundamental wave of stator winding current under fault condition is greater than that without fault,and the fre-quency components of winding current are the same under both conditions.Under normal condition,the order of the radial electromagnetic force of the motor is mainly an integer mul-tiple of the motor pole number 2p.Under fault condition,the motor will additionally gener-ate low-order radial electromagnetic forces.The main frequency of the radial electromagnetic force under normal condition is an even number of times of the power supply frequency f1.The frequency components of the electromagnetic force with the original order will not change after the motor has permanent magnet absence fault.Under fault condition,the main frequency component of the new low-order electromagnetic force with the order of r1 is(2k±r1/p)f1,k=0,1,2,3,….
permanent magnet faultradial electromagnetic forcecurrent harmonicsvector controlfinite element analysis
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