Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1999-06-22
1999-12-21
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310268, 310114, 310 68B, 310266, 310 51, 310DIG3, H02K 2112
Patent
active
060053208
ABSTRACT:
A two-phase brushless direct-current (BLDC) motor having a single Hall effect device. The BLDC motor includes a stator comprised of 2n coils grouping as first and second phase coils at a uniform interval, and a rotor which N-pole and S-pole magnets of the same number as that of the stator coils are alternately disposed, the 2n magnets forming n pairs, each pair of magnets are disposed at a uniform interval, wherein a distant ratio from the center of one N-pole magnet to the centers of the S-pole magnets adjacent the N-pole magnet is established into 1:1.4. Since 2n auxiliary magnets are disposed annularly on the rotor with the same length as each other corresponding to the N-pole and S-pole magnets, a single Hall effect device detects the magnetic pole by magnetic flux of the rotating auxiliary magnets and generates the rotating position signal of the rotor, so that a switching controller can activate the first and second phase coils alternately. Thus, the motor has a simple driving circuit, a high efficiency and a small torque ripple.
REFERENCES:
patent: 4211963 (1980-07-01), Muller
Kim Byung Kyu
Kim Joon
Amotron Co., Ltd.
Ghahramani Saeed
Ramirez Nestor
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