Drive circuit for a sensored brushless DC motor

Details Drive circuit for a sensored brushless DC motor Drive circuit for a sensored brushless DC motor

2008-07-01

2008-07-01

Donovan, Lincoln (Department: 2837)

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

C318S767000

Reexamination Certificate

active

07394975

ABSTRACT:
A drive circuit for a sensored brushless DC motor, which has a rotably mounted rotor hub, comprises four legs. Each leg has a MOSFET and a diode configured to form four individual nodes. A first primary stator winding is coupled between the first and second nodes, while a second primary stator winding is coupled between the third and fourth nodes. A Hall sensor and an associated interface circuit which detects positions of magnets associated with the motor. As a result of the detected position, the drive circuit turns the MOSFETs on and off in a specified manner so as to rotate the rotor hub without the need for a snubber circuit.

REFERENCES:
patent: 6008602 (1999-12-01), Karwath
patent: 6452349 (2002-09-01), Hahn et al.

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