Title:
INDUCED VOLTAGE DETECTION CIRCUIT OF BRUSHLESS MOTOR
Document Type and Number:
Japanese Patent JPS61170290
Kind Code:
A
Abstract:
PURPOSE:To accurately detect the induced voltage of a drive winding at a high speed by inserting an impedance element between a communication segment and the drive winding, and forming a bridge circuit having the winding between arbitrary two terminals of the drive winding as one side. CONSTITUTION:Currents flowed to the drive windings 2-1, 2-2 of a motor are alternately commutated by a commutator to rotate a field rotor 1, and induced voltages are generated at the drive windings 2-1, 2-2. Impedance elements 5-1-5-3 are inserted between the commutation segment of the commutator and the windings 2-1, 2-2 to form a bridge circuit together with the winding 2-1. The potential difference of the two vertexes of the bridge circuit is detected by a differential amplifier 5-8 to detect the momentary value of the induced voltage induced in the winding 2-1. Similarly, the momentary value of the induced voltage induced in the winding 2-2 is detected by a differential amplifier 5-9.
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Inventors:
NAKAOKA KENKICHI
YAMAGUCHI MASAYUKI
ARIGA TAKASHI
MAEJIMA NORIHARU
YAMAGUCHI MASAYUKI
ARIGA TAKASHI
MAEJIMA NORIHARU
Application Number:
JP1043785A
Publication Date:
July 31, 1986
Filing Date:
January 23, 1985
Export Citation:
Assignee:
SHINANO DENKI KK
International Classes:
H02P6/16; H02P6/06; H02P6/08; H02P6/17; H02P6/182; H02P6/21; (IPC1-7): H02P6/02
Domestic Patent References:
| JPS5446309A | 1979-04-12 |
Attorney, Agent or Firm:
Suzuki Makoto