Direct torque control strategy of five‐phase PMSM with load capacity enhancement

Abstract

A direct torque control (DTC) strategy of five-phase permanent magnet synchronous motor (PMSM) is proposed in this study. The proposed DTC scheme uses five-phase inverter to output basic voltage vector or discrete synthesised voltage vectors in one control period to realise the direct control of torque and flux on the fundamental and third harmonic planes simultaneously, and then realise the third harmonic current injection to enhance the load capacity. In order to realise the third harmonic current injection with maximum torque outputting and minimum peak of stator current, the maximum torque per ampere (MTPA) scheme is proposed in which the minimum copper loss and the same phase relation between fundamental and third harmonic currents are taken as the constraint conditions, and the amplitude of the fundamental and third harmonic fluxes and the optimal torque distribution ratio are derived in MTPA. A TMS320F2812-based digital controller is adopted as a core to construct the DTC experimental platform of the five-phase PMSM with 800 W rated power. The results of experiment and simulation show that the proposed DTC strategy can improve the maximum load torque of the motor, reduce the flux density of the stator and improve the core utilisation rate of the stator.

Optimum Design of Fractional Order PIᵅ Speed Controller for Predictive Direct Torque Control of a Sensorless Five-Phase Permanent Magnet Synchronous Machine (PMSM)

“…According to Eqns. (2) and (15), the prediction of the stator flux components at the next sampling instant can be expressed as follows:…”

“…Due to these merits, this has motivated researchers to increase interest in the use of multiphase machine for critical applications such as electrical propulsion systems for ships, offshore wind farms, and electric aircraft. Among the multiphase machines, fivephase and six phase induction or synchronous machines are the most considered in the literature [1][2][3][4]. In the present study a special focus will be given to the five-phase permanent magnet synchronous motor drive (PMSM).…”

Feedforward Neural Network-DTC of Multi-phase Permanent Magnet Synchronous Motor Using Five-Phase Neural Space Vector Pulse Width Modulation Strategy

“…DTC method with a sinusoidal stator current waveform was proposed to regulate the current of FP-PMSM [28]. DTC technique with load capacity enhancement was proposed to control FP-PMSM drives [29]. DTC technique with optimized vector tables of FP-PMSM is introduced [30].…”

Sensorless flux adaption DTFC of an IPMSM based on an active flux‐based MTPA and an adaptive second‐order sliding mode observer

“…However, the conventional method adopts hysteresis comparators to realise DTC. Therefore, the switching frequency of the inverter is unfixed [4, 5]. Furthermore, the selected voltage vector cannot accurately compensate the stator flux amplitude error and torque error.…”