Controller for a brushless direct current motor

Details Controller for a brushless direct current motor Controller for a brushless direct current motor

2006-12-26

2006-12-26

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S599000, C318S129000, C318S503000, C318S134000, C318S741000, C318S760000

Reexamination Certificate

active

07154239

ABSTRACT:
A controller includes a power source unit, a drive circuit, and a state control circuit. The drive circuit is coupled to the power source unit, and includes a drive coil and a switching transistor unit. The switching transistor unit is operable in one of a circuit-making state for making an electrical circuit between the drive coil and the power source unit so as to enable the drive coil to drive rotation of a rotor of a brushless direct current motor, and a circuit-breaking state for breaking the electrical circuit between the drive coil and the power source unit. The state control circuit is coupled to the power source unit, and includes a pulse width modulator, a sensing coil, and a control transistor coupled electrically in series. The state control circuit controls operation of the switching transistor unit according to magnetic position of the rotor relative to the sensing coil.

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patent: 7109691 (2006-09-01), Brooks et al.

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