Title:
DAMPING CIRCUIT FOR DIRECT DRIVE TYPE MOTOR
Document Type and Number:
Japanese Patent JPS58163280
Kind Code:
A
Abstract:
PURPOSE:To shorten time up to stoppage from the state of constant speed of the motor effectively by detecting the revolution and stoppage of the motor under the state of a reversal mode through stopping operation and interrupting the supply of a power supply to a drive circuit by the detection output. CONSTITUTION:An output from a frequency generator generating frequency proportional to the number of revolution of the motor is compared with reference voltage by an error amplifying circuit 3 through an amplifier 1 and a F-V converter 2, and armature currents are supplied by a torque command circuit 4 receiving the comparison output. An output from a stop command circuit 8 is transmitted to a rotation-direction setting circuit 7 through stopping operation, and changed over to the reversal mode in the circuit 7. When the number of revolution of the motor reaches zero, an output from the amplifier 1 expires, and an output from a detecting circuit 9 also expires. Accordingly, a control circuit 10 emits a power-supply opening command, a power-supply switching circuit 5 is brought to an opened state, and the motor is stopped.
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Inventors:
KUSUHARA KAZUHIRO
Application Number:
JP4432582A
Publication Date:
September 28, 1983
Filing Date:
March 18, 1982
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H02P3/10; H02P3/06; (IPC1-7): H02P3/10
Attorney, Agent or Firm:
Akira Kobiji (2 outside)