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Energies 2018, 11(10), 2729; https://doi.org/10.3390/en11102729

A Composite Vectors Modulation Strategy for PMSM DTC Systems

1
School of Information Science and Engineering, Northeastern University, Shenyang 110819, China
2
School of Humanities and Law, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Received: 21 September 2018 / Revised: 7 October 2018 / Accepted: 10 October 2018 / Published: 12 October 2018
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Abstract

The operation performance of permanent magnet synchronous motors (PMSMs) driven by direct torque control (DTC) are affected by torque error compensation and flux error compensation in each control period. The error compensational effects provided by different vectors under different control strategies are analyzed in this paper. The precondition of accurate error compensation is applied to the proposed novel composite vectors modulation strategy (CVM) for a PMSM DTC system. In CVM-DTC, the operating conditions of PMSM are divided into three cases according to the relationships between the errors and the actual error compensations, including steady-state case, dynamic-state case, and transient-state case. In order to establish the novel CVM-DTC strategy smoothly, the effect factors are introduced and used to represent the error compensational effects, which are obtained through the proposed effect factors’ controller. The analysis of error compensational effects provided by single active vector and synthetic voltage vector are described in detail while the PMSM is operated in different operation conditions. Finally, the effectiveness of the novel CVM-DTC strategy is verified through the experimental results in a 100-W PMSM drive system. View Full-Text
Keywords: permanent magnet synchronous motor (PMSM); direct torque control (DTC); composite vectors modulation (CVM); effect factors permanent magnet synchronous motor (PMSM); direct torque control (DTC); composite vectors modulation (CVM); effect factors
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Wang, D.; Yuan, T.; Wang, X.; Wang, X.; Li, W. A Composite Vectors Modulation Strategy for PMSM DTC Systems. Energies 2018, 11, 2729.

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