Abstract
The interior permanent magnet synchronous motor (PMSM) can offer many advantages, including high power-to-weight ratio, high efficiency, rugged construction, low cogging torque and the capability of reluctance torque, so it is widely used in electric vehicle (EV). Two control schemes, namely field oriented control (FOC) and direct torque control (DTC) are used in PMSM drive. In order to decrease current and torque ripple and fix switching frequency, an improved DTC scheme based on the control of stator flux, torque angle and torque was proposed, which used voltage vector selection strategy and the technology of space vector modulation (SVM) to generate the applied voltage vector instead of switching table. And this paper compared these three control schemes based on a 15-kW interior PMSM used in Honda Civic 06My hybrid electrical vehicle. Experimental results show for the FOC using the hysteresis current control, due to the lower sampling period, stator current is more sinusoidal. But it needs the continuous rotor position information and the switching frequency of the VSI is not constant. For the DTC using switching table, current ripple is higher and the switching frequency of the VSI is also not constant. But it does not need the rotor position information except for the initial rotor position. Compared with switching table, the proposed DTC can decrease current and torque ripple and fix switching frequency.
Highlights
Electric propulsion systems are the hearts of electric vehicle (EV)
The tested electric drives used in this paper consist of three parts: the tested motor, the voltage source inverter (VSI) and the processor
Experimental results show under the control of the field oriented control (FOC) stator current is sinusoidal, but the switching frequency of the VSI is not constant due to the use of the hysteresis control
Summary
Electric propulsion systems are the hearts of EV. For the interior PMSM, there are two different high-performance control strategies, namely, the FOC and the DTC. Both of them are widely used in the industry application. The FOC is implemented in the rotor flux reference frame and needs the continuous rotor position information to implement the coordinate transformation. In order to decrease current and torque ripple and fix switching frequency, an improved DTC scheme based on the control of stator flux, torque angle and torque was proposed, which used voltage vector selection strategy and the technology of space vector modulation (SVM) to generate the applied voltage vector instead of switching table. This paper compared these three control schemes based on a 15kW interior PMSM used in Honda Civic 06My hybrid electrical vehicle
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