Title:
SINGLE-PHASE AC ELECTRIC MOTOR VELOCITY CONTROLLER
Document Type and Number:
Japanese Patent JPH077988
Kind Code:
A
Abstract:
PURPOSE: To provide a variable speed controller for a single-phase AC induction motor that has its auxiliary coil, which is in series with a capacitor, continuously excited while a controllable switch is in series with the main coil of the motor. CONSTITUTION: A switch 34 is always open, when no current flows to a main coil 24. When this switch 34 is opened, the counter electromotive force of the main coil 24 is detected 36 for measuring the speed of a motor 10. This counter electromotive force is compared 44 with a necessary speed signal, and this comparison is used to control the closed circuit of the switch. The motor 10 is held at a necessary constant speed, even if load varies.
Inventors:
HAWAADO ERU BETSUKAAMAN
Application Number:
JP27594A
Publication Date:
January 10, 1995
Filing Date:
January 06, 1994
Export Citation:
Assignee:
MECH INJIENIYUITEII CORP
International Classes:
H02P23/00; H02P25/04; (IPC1-7): H02P5/28
Domestic Patent References:
| JP44030140A | ||||
| JPS4518260Y1 | 1970-07-25 | |||
| JPS49133825A | 1974-12-23 |
Attorney, Agent or Firm:
Kyozo Yuasa (5 people outside)
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