Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-10-16
1994-02-22
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310156, H02K 3700
Patent
active
052890643
ABSTRACT:
An inner- or outer-rotor type three-phase permanent magnet stepping motor constituted by a stator having circumferentially equidistantly arranged three magnetic poles each having small teeth equal in number and in pitch, and a rotor rotatably arranged along the circumference of the stator and constituted by a cylindrical permanent magnet magnetized to provide circumferentially alternately arranged pairs of north and south poles, the number of the pairs being selected to Zm under the condition that Zm satisfies Zm=3n-1 or Zm =3n+1 (n being a natural number not smaller than 1). Alternatively, the rotor is constituted by a ring-like permanent magnet magnetized so as to form two magnetic poles in the axial direction thereof and a pair of gear-like magnetic bodies each having Zr teeth on its circumference are arranged respectively on the axially opposite ends of the ring-like permanent magnet. The respective teeth arrangements of the gear-like magnetic bodies are circumferentially shifted by 1/2 teeth pitch, under the condition that the number Zr of the teeth satisfies Zr=3n-1 or Zr-3n+1. Further, the small teeth of the stator are circumferentially arranged substantially in the same pitch as that of the poles or teeth of the rotor so that static and dynamic torque of the stepping motor including cogging torque are increased.
REFERENCES:
patent: 3599069 (1971-08-01), Welch
patent: 4095161 (1978-06-01), Heinz et al.
patent: 4672253 (1987-06-01), Tajima et al.
Japan Servo Co. Ltd.
Stephan Steven L.
To E.
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