Discretization Error Compensation Method in High‐Speed Motor Drive System by using Direct Torque Control

SUMMARY In this paper, a discretization error compensation method in a motor drive system by using direct torque control (DTC) is proposed. Similar to a conventional current control system, DTC allows an efficient drive and a wide range drive. Furthermore, it has the advantage that its control syste...

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Bibliographic Details
Published in:Electrical engineering in Japan 2017-12, Vol.201 (4), p.45-54
Main Authors: MATSUYAMA, TETSUYA, TOMIGASHI, YOSHIO, YOSHIMOTO, JUNKI, INOUE, YUKINORI, MORIMOTO, SHIGEO
Format: Article
Language:English
Subjects:
Control systems
direct torque control
Discretization
discretization error
Error compensation
Error detection
High speed
high‐speed drive
Magnetic flux
maximum torque per ampere (MTPA) control
Motors
permanent magnet synchronous motor
Position sensing
stator magnetic flux
Synchronous motors
Torque
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Summary:SUMMARY In this paper, a discretization error compensation method in a motor drive system by using direct torque control (DTC) is proposed. Similar to a conventional current control system, DTC allows an efficient drive and a wide range drive. Furthermore, it has the advantage that its control system can be simple and theoretically it can realize sensorless position control. Therefore, a reference flux vector calculator (RFVC) DTC is studied as a system for the ultra‐high‐speed drive control of permanent magnet synchronous motors (PMSMs). In high‐speed drive, we revealed that a discretization error in the DTC generates an error in the instruction magnetic flux and stator magnetic flux. In addition, we revealed that current detection timing generates an error in the estimated torque and real torque. Then, we propose a compensation method to cancel the flux and torque error focusing on the phase of the stator magnetic flux and experimentally verifying its effectiveness.
ISSN:0424-7760
1520-6416
DOI:10.1002/eej.23002