Reduction of force ripples in linear motors
The influence of higher field harmonics of permanent magnets, and asymmetry of flux linkages according to the phase shift on the value of force ripples in linear motors is studied. The solution to this problem is based on a higher field harmonics analysis in the active zone of a two-phase permanent-magnet cylindrical linear motor. The laws of gate current variation due to the position of the slider, which allows the compensation of these ripples, are established.