Motor driver

Details Motor driver Motor driver

2006-10-24

2006-10-24

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S254100, C318S448000, C318S459000, C318S721000

Reexamination Certificate

active

07126301

ABSTRACT:
A motor driver drives a motor composed of a rotor and plural-phase windings that generate a magnetic field for rotating the rotor, including: a plurality of transistors that operate as switches for supplying current to the windings; a position detector operable to detect a rotational position of the rotor, based on a terminal voltage of each winding; and a switching controller operable to have performed a switching method to turn the transistors to an ON state or to an OFF state for controlling the rotor at the predetermined speed by means of the position detector, wherein the switching controller further controls so as to force each of the transistors into the OFF state for a predetermined duration in a predetermined cycle, and the position detector detects only while the switching controller forcedly keeps the transistor in the OFF state.

REFERENCES:
patent: 4712050 (1987-12-01), Nagasawa et al.
patent: 5075608 (1991-12-01), Erdman et al.
patent: 5929577 (1999-07-01), Neidorff et al.
patent: 5969491 (1999-10-01), Viti et al.
patent: 5990643 (1999-11-01), Holling et al.
patent: 6534938 (2003-03-01), Wu et al.
patent: 1 098 431 (2001-05-01), None
patent: 1 220 439 (2002-07-01), None
patent: 2000-37089 (2000-02-01), None
patent: 2002-199776 (2002-07-01), None

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