Title:
DRIVE CIRCUIT FOR DIRECT CURRENT MOTOR
Document Type and Number:
Japanese Patent JPS58107084
Kind Code:
A
Abstract:
PURPOSE:To obtain the simple drive circuit at low cost having no logic circuit through logical operation at a pre-drive stage by connecting the intermediate point of the pre-drive stage controlling the driving transistor of a DC brushless motor at the output side of other phase. CONSTITUTION:When time is 0<+>, each output A1-A3 of position detectors 11, 21, 31 is at H, L and H respectively, transistors 102a, 104a are at ON, currents IC1 flow in the direction opposite to an arrow, a transistor 105a is at ON, and output B1 reaches V-. Transistors 302c, 304c are at ON by the H of output A3, but both transistors 305c, 306c are at OFF because output B1 is V-, and output B3 reaches the intermediate point potential of voltage between B2 and B1 formed by currents through stator winding 22, 12. A transistor 202b is at OFF and 203b is at ON by the L of output A2, currents IC2 flow in the arrow direction, and the current value reaches the half or less of IC1, but a transistor 206b is at ON, and output B2 reaches V+.
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Inventors:
MITAMURA MASAHIRO
Application Number:
JP20528581A
Publication Date:
June 25, 1983
Filing Date:
December 21, 1981
Export Citation:
Assignee:
HITACHI LTD
International Classes:
H02P6/08; H02P6/06; (IPC1-7): H02P6/02
Attorney, Agent or Firm:
Akio Namiki
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