Title:
DRIVE DEVICE FOR MOTOR
Document Type and Number:
Japanese Patent JPS58165678
Kind Code:
A
Abstract:
PURPOSE:To prevent a phase locked loop frequency synthesizer from being locked to an erroneous frequency by applying the output from a control circuit to a motor drive circuit after the drive circuit reaches the normal state. CONSTITUTION:The synchronization of a phase locked loop frequency synthesizer 12 is not obtained at the initial starting time of a motor 5, and a synchronization detector 60 conducts the common contact 54 of a changeover switch 48 to individual contacts 50 via a control circuit 61. Thus, the motor 5 can be arrived at the normal operation. After the motor 5 reaches the normal operation, the synthesizer 12 can perform the accurate locked state. At this time the detector 10 produces a synchronization detection signal, and the control circuit 61 switches and conducts the common contact 54 of the switch 48 to individual contacts 49. The motor 5 is driven to obtain a linear speed corresponding to the oscillating frequency of a reference frequency signal generator 42.
Inventors:
FUKUDA SHINJI
SUZUKI KEIICHI
SUZUKI KEIICHI
Application Number:
JP4785582A
Publication Date:
September 30, 1983
Filing Date:
March 24, 1982
Export Citation:
Assignee:
FUJITSU TEN LTD
International Classes:
H02P29/00; (IPC1-7): H02P5/00
Attorney, Agent or Firm:
Nishikyo Keiichiro