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Title: Torque limit of PM motors for field-weakening region operation

Abstract

The invention includes a motor controller and technique for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent magnet motor is controlled by receiving a torque command, determining a physical torque limit based on a stator frequency, determining a theoretical torque limit based on a maximum available voltage and motor inductance ratio, and limiting the torque command to the smaller of the physical torque limit and the theoretical torque limit. Receiving the torque command may include normalizing the torque command to obtain a normalized torque command, determining the physical torque limit may include determining a normalized physical torque limit, determining a theoretical torque limit may include determining a normalized theoretical torque limit, and limiting the torque command may include limiting the normalized torque command to the smaller of the normalized physical torque limit and the normalized theoretical torque limit.

Inventors:
 [1];  [2]
  1. Beachwood, OH
  2. Richfield, OH
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1036713
Patent Number(s):
8,115,437
Application Number:
US patent applicaiton 12/036,099
Assignee:
Rockwell Automation Technologies, Inc. (Mayfield Heights, OH) NREL
DOE Contract Number:  
NREL-ZCL-3-32060-03; W(A)-03-011; CH-1137
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Royak, Semyon, and Harbaugh, Mark M. Torque limit of PM motors for field-weakening region operation. United States: N. p., 2012. Web.
Royak, Semyon, & Harbaugh, Mark M. Torque limit of PM motors for field-weakening region operation. United States.
Royak, Semyon, and Harbaugh, Mark M. Tue . "Torque limit of PM motors for field-weakening region operation". United States. https://www.osti.gov/servlets/purl/1036713.
@article{osti_1036713,
title = {Torque limit of PM motors for field-weakening region operation},
author = {Royak, Semyon and Harbaugh, Mark M},
abstractNote = {The invention includes a motor controller and technique for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent magnet motor is controlled by receiving a torque command, determining a physical torque limit based on a stator frequency, determining a theoretical torque limit based on a maximum available voltage and motor inductance ratio, and limiting the torque command to the smaller of the physical torque limit and the theoretical torque limit. Receiving the torque command may include normalizing the torque command to obtain a normalized torque command, determining the physical torque limit may include determining a normalized physical torque limit, determining a theoretical torque limit may include determining a normalized theoretical torque limit, and limiting the torque command may include limiting the normalized torque command to the smaller of the normalized physical torque limit and the normalized theoretical torque limit.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {2}
}

Patent:

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