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Industrial applications often require two or more variable-speed electric drives, which have to be controlled independently. Over the past decade research efforts have been made to reduce the number of power electronic devices required in multi-motor drive systems in order to reduce the complexity and hence cost of the drive. One such drive system comprises n three-phase motors supplied by a (2n+1)-leg...
This paper presents a new kind of direct torque control (DTC) system based on the inverter with double-frequency for the motor drives of electric vehicles (EVs). According to the theory of the converter with double-frequency, the topology of a new kind of inverter with double-frequency is derived, and the operation states of the new circuit are analyzed. This kind of inverter has good dynamic and...
In this paper, an algorithm for power factor correction (PFC) of direct torque control (DTC) brushless dc motor drive in the constant torque region is presented. The proposed DTC approach introduces a two-phase conduction mode as opposed to the conventional three-phase DTC drives. Unlike conventional six-step PWM current control, by properly selecting the inverter voltage space vectors of the two-phase...
A novel stator hybrid excited doubly salient (HEDS) brushless motor is presented in this paper. The topology and operation principle of the proposed motor are introduced. As supply to the HEDS motor drive system, a power converter with split capacitors is used and a basic current control method for this converter is explained. To achieve the maximum torque, an advanced angle control scheme is developed...
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