Title:
CONTROLLER OF DC MOTOR
Document Type and Number:
Japanese Patent JPS6169383
Kind Code:
A
Abstract:
PURPOSE:To prevent a control response from deteriorating due to the interruption of a current by gain compensating for the interruption of the current by detecting in advance whether the interruption of the current occurs or not. CONSTITUTION:A counterelectromotive force detector 41 calculates a countere lectromotive force signal 42 of a DC motor from a speed feedback signal 2, and inputs it together with a phase control signal 9 to an amplitude discrimina tor 43. The discriminator 43 outputs an amplitude discrimination signal 44 which becomes '0' when the signal 9 is larger than the signal 42 and '1' when smaller. In case of positive current, when the output of the signal 44 is '1', it is judged as the interruption state of the current. In case of negative current, when the output is '0', it is discriminated as the interruption of the current. Thus, the interruption of the current can be discriminated before firing a thyris tor, the gain compensation for the interruption of the current can be easily performed to prevent the control response from deteriorating due to the interrup tion of the current.
Inventors:
HOSODA HIROMI
Application Number:
JP19051884A
Publication Date:
April 09, 1986
Filing Date:
September 13, 1984
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
H02P7/292; (IPC1-7): H02P5/168
Domestic Patent References:
| JPS59123486A | 1984-07-17 |
Attorney, Agent or Firm:
Yoshiaki Inomata