Title:
DRIVING CIRCUIT FOR BRUSHLESS MOTOR
Document Type and Number:
Japanese Patent JPS5826584
Kind Code:
A
Abstract:
PURPOSE:To suppress generation of flyback pulses to be generated by inductance of driving coils for a brushless motor by a method wherein capacitors are connected respectively between bases and collectors of transistors for energization of the respective driving coils of the brushless motor. CONSTITUTION:The capacitors C1a-C1c connected respectively between the bases and the collectors of the transistors T3a-T3c make transferring time of the transistors T3a-T3c from ON to OFF to elongate by the what is called Miller effect when the transistors T3a-T3c transfer from ON to OFF, and mitigate variation of conducting currents of the driving coils MCa-MCc. Resistors R2a-R2c are for the bypaths of currents intending to make the transistors T3a-T3c to ON flowing into the bases of the transistors T3a-T3c through the capacitors C1a-C1c, and resistors R1a-R1c are for protection of output circuits of voltage comparators CPa-CPc.
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Inventors:
IMAI NOBUHIRO
MATSUO SHINICHI
NAKANO TAKASHI
KIMIZUKA JIYUNICHI
MATSUO SHINICHI
NAKANO TAKASHI
KIMIZUKA JIYUNICHI
Application Number:
JP9076782A
Publication Date:
February 17, 1983
Filing Date:
May 28, 1982
Export Citation:
Assignee:
CANON KK
International Classes:
H02K29/00; H02P6/10; H02P6/14; (IPC1-7): H02K29/00
Attorney, Agent or Firm:
Marushima Giichi