Title:
CONTROL SYSTEM FOR SYNCHRONOUS MOTOR USED FOR SERVO MOTOR
Document Type and Number:
Japanese Patent JPS5815479
Kind Code:
A
Abstract:
PURPOSE:To use a permanent magnet revolving-field synchronous brushless motor as a servo motor by a method wherein a small-bit-numbered pulse coder with sufficiently large resolution is used. CONSTITUTION:A disc-shaped pulse coder 1 has the first pulse coder element 3 with three-bit segments 2, 2' and 2'', it can read an absolute angle position for the region of 2<3>=divided in eight parts, and besides, in each region which was divided in eight parts as above, it has the second pulse coder element 4 which was divided in twenty parts, for example, to give an increment, and it reads a relative angle position alone. Accordinly, an absolute angle position is detected at the moment when the synchronous motor started and the angle region (segment) of the first pulse coder element 3 made a change, and from this time on, the absolute angle position of the rotor will be detected successively by adding the output of the second pulse coder element 4 to the above absolute angle position.
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Inventors:
KOBARI YOSHIO
Application Number:
JP11076181A
Publication Date:
January 28, 1983
Filing Date:
July 17, 1981
Export Citation:
Assignee:
FUJITSU FANUC LTD
International Classes:
H02P6/16; G01B7/30; G01D5/249; H02P25/02; (IPC1-7): G01B7/00; H02P6/00
Domestic Patent References:
| JPS5333162A | 1978-03-28 |
Attorney, Agent or Firm:
Seiichi Samukawa