Abstract
The dual-redundancy permanent magnet synchronous motor (DRPMSM) has high reliability in its applications. Compared with the traditional permanent magnet synchronous motor (PMSM), small teeth were added to the stator in DRPMSM and its vibration has new characteristics. This paper derived the analytic expression of the radial electromagnetic force for PMSM in the air gap based on the Maxwell stress equation and summarized its sources. The simplified stator teeth model of the traditional PMSM and DRPMSM were established in 12-slot/10-pole (12s10p), and the analytical expression and Fourier expansion of radial electromagnetic force on the teeth were given. The electromagnetic and structural finite element models of the motor were established, and analyses of modal and harmonic response were carried out. The simulation results show that the stator vibration amplitude of DRPMSM is smaller than that of traditional PMSM at no-load and is also bigger under rated load. Furthermore, in order to guarantee the low amplitude of stator vibration under rated load for DRPMSM, the width of the small teeth should be smaller.
Highlights
The permanent magnet synchronous motor (PMSM) has been widely applied in various fields due to its simple structure, high power density, and reliable operation [1,2,3,4,5,6,7,8,9,10]
When the load time is equal to 1, the amplitude of vibration velocity caused by the radial electromagnetic force acting on big and small teeth is bigger than that on big teeth alone, and the larger the width of the small teeth, the larger the velocity difference
The coefficient amplitudes alkY obtained by Fourier expansion of the radial electromagnetic force pYl are different
Summary
The permanent magnet synchronous motor (PMSM) has been widely applied in various fields due to its simple structure, high power density, and reliable operation [1,2,3,4,5,6,7,8,9,10]. A dual-redundancy permanent magnet synchronous motor (DRPMSM) with no electromagnetic coupling and low heat coupling between phase windings was evolved from PMSM of 12-slot/10-pole (12s10p). Resonance when the variable frequency, the electromagnetic amplitude of vibration can be reduced by eliminating the radialoccurs electromagnetic radial force[16]. Resonancewith occurs thefrequency radial electromagnetic consistent greatthe vibration and noiseof[17] It is and interesting the vibration with modal frequency the stator will leadtotonote greatthat vibration and noiseaffecting [17]. It is permanent interesting magnets on the vibration motor is higher than the rated magnets load in PMSM. Basis of abovementioned research, the radial electromagnetic electromagnetic on thetoyoke equivalent to of thedifferent superposition of different order waves force on the yokeforce equivalent the superposition order force waves and the force influence of and influence of vibration extra small on vibration in DRPMSM are analyzed in this paper
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