Direct torque and adaptive flux control of novel transverse-flux permanent magnet motor with brushless DC drive

To solve the problem of controlling the stator flux linkage amplitude, a direct torque control (DTC) scheme is proposed for a novel transverse-flux permanent magnet motor (TFPMM) with two-phase conduction mode of brushless DC drive. In this approach, flux linkage hysteresis comparator is removed and the desired voltage space vector is determined by only stator flux position and the output from torque hysteresis comparator, obtaining adaptive stator flux linkage. Further, reasonable phase compensation for the difference of optimal phase advance angle and the angle between stator and rotor flux is adopted to obtain maximum torque per ampere in the constant torque region. The validity and effectiveness of the proposed DTC scheme are verified through simulation results.