Title:
CONTROLLER FOR MULTI-PHASE MOTOR
Document Type and Number:
Japanese Patent JP2001161089
Kind Code:
A
Abstract:
To detect malfunction in the Hall element of a brushless DC motor with a simple structure.
The output signals (a), (b), (c) of Hall elements 18-1, 18-2, 18-3 are inputted into an MPU22. The MPU22 calculates the respective frequencies of the output signals (a), (b), (c) and compares them. If the output signals are substantially equal to each other, it is taken as no malfunction. On the other hand, if the three frequencies are not equal, it is considered as malfunction.
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Inventors:
OGI YASUSHI
Application Number:
JP33868999A
Publication Date:
June 12, 2001
Filing Date:
November 29, 1999
Export Citation:
Assignee:
NIKKISO CO LTD
International Classes:
G05B23/02; H02P6/12; (IPC1-7): H02P6/12; G05B23/02
Attorney, Agent or Firm:
Kenji Yoshida (2 outside)