Title:
SPEED CONTROLLER
Document Type and Number:
Japanese Patent JPS59181989
Kind Code:
A
Abstract:
PURPOSE:To enable to accurately control a speed irrespective of the rotating speed by altering the conversion ratio of an electric amount proportional to the rotating speed in response to the rotating speed. CONSTITUTION:Two speed controllers 4, 13 are provided, and normal-closing contacts 16, 18, 19, 21 are closed and normal-open contacts 17, 20 are opened to control by a speed controller 13 at a low speed time. The previous contacts are changed to control by the controller 4 at a high speed time. In this speed controller, the conversion ratio (1/10, 10/1 times) of a converter 3a is varied in response to the rotating speed of a motor 1, thereby using differently a measuring range according to high or low speed operation. Accordingly, a suitable reference voltage can be always applied to the controller 4 and the current controller 5 of 13-th stage.
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Inventors:
NAKANO FUMIO
Application Number:
JP5735283A
Publication Date:
October 16, 1984
Filing Date:
March 30, 1983
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H02P29/00; G05D13/62; (IPC1-7): H02P5/00
Attorney, Agent or Firm:
Shinichi Kusano