Brushless motor

Details Brushless motor Brushless motor

2005-12-06

2005-12-06

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

06972503

ABSTRACT:
A brushless motor A includes a permanent magnet used as a rotor1that is driven by three-phase power supply, wherein the permanent magnet is magnetized by a trapezoidal magnetization, and the trapezoidal magnetization is applied such that a generation period of a cogging torque is set to almost half of the generation period of the cogging torque generated when the permanent magnet to which a square magnetization is applied is used. In this brushless motor A, preferably a skew magnetization is also applied to the rotor1. Further, in case of driven by a sinusoidal-wave current, the skew angle is set to the angle in the range that has ±15% of the reference angle as an upper limit and a lower limit by a combination of a trapezoidal magnetization and a skew magnetization.

REFERENCES:
patent: 4547714 (1985-10-01), Muller
patent: 4812692 (1989-03-01), Arita
patent: 5220228 (1993-06-01), Sibata
patent: 5652470 (1997-07-01), von der Heide et al.
patent: 5757100 (1998-05-01), Burgbacher
patent: 5773908 (1998-06-01), Stephens et al.
patent: 6104117 (2000-08-01), Nakamura et al.
patent: 6242837 (2001-06-01), Matsunobu et al.
patent: 6285104 (2001-09-01), Nashiki
patent: 6713921 (2004-03-01), Sebastian et al.
patent: 2002/0003382 (2002-01-01), Nakano et al.
patent: 2002/0047431 (2002-04-01), Fukushima
patent: 0 544 310 (1993-06-01), None
patent: 1 257 039 (2002-11-01), None
patent: 09-140104 (1997-05-01), None
patent: 10-178766 (1998-06-01), None
patent: 2000-134893 (2000-05-01), None
Journal of the Japan Society of Mechanical Engineers 2002.1, V. 105, No. 998, p. 58.
Bianchi, Nicola, et al., “Design Techniques for Reducing the Cogging Torque in Surface-Mounted PM Motors”, IEEE Transactions On Industry Applications, vol. 38, No. 5, Sep./Oct. 2002, pp. 1259-1265.
Hwang, Sang-Moon, et al., “Various Design Techniques to Reduce Cogging Torque by Controlling Energy Variation in Permanent Magnet Motors”, IEEE Transactions On Magnetics, vol. 37, No. 4, Jul. 2001, pp. 2806-2809.

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