Title:
【発明の名称】電動機制御装置及び方法
Document Type and Number:
Japanese Patent JP3107230
Kind Code:
B2
Abstract:
A three-phase motor (10) is operated by a controller having sets of thyristors (16,17,18) which when triggered switch electricity from each phase (A,B,C) of a supply to the motor. The motor (10) is started by triggering the thyristors (16,17,18) to be conductice during successively greater portions of each cycle of the AC power. In order to reduce the cooling requirements for the controller, a contactor (15) is connected in parallel with the thyristors (16,17,18) to provide apply power to the motor (10) once it reaches full speed. When the controller receives a signal to stop the motor (10), the contactor (15) is deactivated and the controller goes through a sequence to synchronize the thyristor triggering process to the phase of the AC power supply. The synchronizing process provides a smooth transition from contractor control back to the thyristors control of the electricity application to the motor (10). Once the thyristor control resumes, the controller executes a triggering routine which decreases the voltage applied to the motor.
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Inventors:
Robert Jay Delange
John C. Merison
John C. Merison
Application Number:
JP4796391A
Publication Date:
November 06, 2000
Filing Date:
March 13, 1991
Export Citation:
Assignee:
Allen-Bradley Company, Inc.
International Classes:
H02P1/28; H02P3/18; H02P27/02; (IPC1-7): H02P7/622; H02P3/18
Domestic Patent References:
| JP60134785A | ||||
| JP4229086A | ||||
| JP59112870U |
Other References:
【文献】米国特許4100469(US,A)
【文献】米国特許4142136(US,A)
【文献】米国特許4142136(US,A)
Attorney, Agent or Firm:
Akira Asamura (3 outside)