Abstract
In order to decrease torque pulsations in contactless DC motors, the current in the armature winding sections is varied in a smooth or stepped manner at each interval between the switching moments (SI). With such control, the current reaches its maximum value at the beginning and end of each interval and has its minimum value at the middle of the interval. The laws for controlling the motor current with respect to rotor position are proposed together with devices using which such control can be implemented. Expressions for the relative electromagnetic torque and its pulsations are obtained. The requirements for the characteristics of control devices at the real minimum-to-maximum torque ratio with the usual armature winding switching pattern, and with permissible torque pulsations not exceeding 1.5% are defined.
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