Research on Vector Control and PWM Technique of Five-Phase PMSM - Intelligent Computing for Sustainable Energy and Environment - page 266

Research on Vector Control and PWM
Technique of Five-Phase PMSM
Jianyong Su 1 , 2 , Hongwei Gao 1 , Pingzhi Zhao 3 , and Guijie Yang 1
1 School of Electrical Engineering and Automation, Harbin Institute of Technology,
Harbin, China
2 Shenzhen Academy of Aerospace Technology, Shenzhen, Guangdong, China
3 Beijing Leader Harvest Technologies Co, Ltd, Beijing, China
Abstract. The mathematic model that based on vector space for five-
phase permanent magnet synchronous motor (PMSM) is established.
The five-phase PMSM is designed with five sets of windings in
Y-connected mode shifted by 72 electrical degrees. In the model, the
variables of the motor are mapped to the α 1- β 1 fundamental subspace
associated with the electromechanical energy conversion and α 3- β 3third
harmonic subspace. Different from six-phase PMSM, the five-phase model
implies that the harmonic current in α 3- β 3 subspace have positive effect
on electromechanical energy conversion. The vector control scheme for
five-phase PMSM is presented, in which the currents in the subspace
α 1- β 1and α 3- β 3 are controlled in closed loop. A space vector pulse
width modulation (SVPWM) algorithm of five-phase voltage-source in-
verter based on near two vectors is discussed. The voltage in α 1- β 1and
α 3- β 3 can be modulated simultaneously. Through the simulation and
experiment analysis, the vector control method and PWM technique for
five-phase PMSM are proved to be feasible and effective.
Keywords: Five-phase PMSM, Modeling, Vector control, PWM.
1 Introduction
In order to achieve the demand of low-voltage high-power output, there are many
advantages about multi-phase motor, such as small torque ripple and suitable for
fault-tolerant operation, etc [1,2]. The current is sharing to more bridges among
each so that the current could be reduced on the each power device. Therefore,
multi-phase motor could be used with a wide range of applications in the field
that limiting output voltage and requiring high reliability [3,4].
According to the traditional three-phase PMSM, the advantages of five -phase
motor are: (1)increase the torque ripple frequency and reduce the torque ripple
amplitude, (2) run in the case of losing a phase, (3) reduce the harmonic current
in the DC bus [5-7]. The windings structure of five-phase PMSM is separated
by 72 electrical angle, as shown in Fig.1. The five-phase PMSM can be supplied
by the five-phase voltage source inverter (VSI), as shown in Fig.2. Compared
with the three-phase PMSM, modeling and control of five-phase motor is more
complex [8,9].