Title:
CONTROLLER FOR SINGLE-PHASE INDUCTION MOTOR
Document Type and Number:
Japanese Patent JP3933542
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a controller for single-phase induction motor which, if a switch means for controlling excitation is fused, prevents a current limiting resistor from heating and creating danger.
SOLUTION: A current transformer 6 detects a current passed through a single-phase induction motor 15. Based on the output signal of the current transformer 6, a control circuit 8 judges whether a relay switch RL1a has been fused. If the control circuit 8 judges that the relay switch RL1a has been fused, the control circuit turns on a relay switch RY3a to bring a control circuit 13 into conduction. If the relay switch RL1a has been fused, the control circuit 13 turns on a relay switch RL4a. This prevents a current limiting resistor Rs from heating and creating danger.
Inventors:
Tsuneo Suzuki
Yukihito Ando
Yukihito Ando
Application Number:
JP2002229810A
Publication Date:
June 20, 2007
Filing Date:
August 07, 2002
Export Citation:
Assignee:
Sharp Corporation
International Classes:
H02P1/44; H02P21/34; H02P21/36; H02P23/00; H02P23/07; H02P25/04; H02P25/10; (IPC1-7): H02P7/36; H02P1/44
Domestic Patent References:
| JP2001231277A |
Attorney, Agent or Firm:
Shizuo Sano
Shigeki Yamada
Junji Kodera
Shigeki Yamada
Junji Kodera
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