Brushless DC motor and method for driving the same

Details Brushless DC motor and method for driving the same Brushless DC motor and method for driving the same

1997-08-21

1999-05-11

LaBalle, Clayton

Electrical generator or motor structure

Dynamoelectric

Rotary

318254, 318138, H02K11/00;29/03;29/00;29/08

Patent

active

059030747

ABSTRACT:
In a radial gap type brushless DC motor having a motor structure for generating a starting torque and lowering rotational speed fluctuation by forming either one of a pair of upper and lower (right and left) claw poles to have a smaller interval in the circumferential direction with respect to the other claw pole, shifting the position of the upper or lower claw poles toward the rotating direction of the rotor from the middle position of the other claw pole and claw pole, and setting a ratio (a/p) of the claw pole width a and the pole pitch p, a ratio (b/a) of the claw pole width a and the claw pole width b, and a ratio (c/d) of the claw pole pitch c and the claw pole pitch d to fall in a prescribed range, a method for driving a motor forms the generated torque cycle of a cogging torque generated between a permanent magnet rotor (2) and a stator into large and small torque waves, and switches the current of a coil (12) at a high peak of absolute quantity or in the vicinity thereof among a plurality of positive peaks of the cogging torque. Further, a method for driving a motor wherein the coil current is switched at a position where the excited torque generated by the coil current becomes zero or in its vicinity. And, a method for driving a motor wherein the coil current is switched in a vicinity of a positive peak of the cogging torque and giving a no-current passing period when switching the coil current.

REFERENCES:
patent: 4004168 (1977-01-01), Haydon
patent: 4591774 (1986-05-01), Ferris et al.
patent: 4656381 (1987-04-01), Komatsu
patent: 4782272 (1988-11-01), Buckley et al.
patent: 5506458 (1996-04-01), Pace et al.

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