Rotary electric machine

Details Rotary electric machine Rotary electric machine

2004-08-05

2008-07-29

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S064000, C310S089000

Reexamination Certificate

active

07405505

ABSTRACT:
A rotary electric machine includes a frame; a stator whose stator-slot number Ns is 12; a rotor whose rotor-pole number Np is 8, the rotor being disposed inside the stator. The frame has a frame thickness T(θ) at mechanical angle θ, with respect to a reference line that connects the inner circumferential center of the frame with an arbitrary point, other than the center, around the center that is circularly expanded in a Fourier series. The difference between the stator-slot number Ns and the rotor-pole number Np is k (=|Ns−Np|). Stress-relieving spaces and are located in portions of the frame in an arrangement that does not have 90-degree mechanical angle rotational symmetry, in such a way that the sum P of inclusion ratios for the k-th component Tkand the Np-th component TNp, which are the Fourier series expansion coefficients for the frame thickness T(θ) expressed by equation (2)P=(Tk+TN⁢⁢p)/∑n=0∞⁢Tn×100⁡[%],(2)is less than 12%. According to this configuration, mechanical strength of the frame and its producibility are maintained, and cogging torque caused by magnetic-circuit distortion in an iron core generated due to the frame shape is also reduced.

REFERENCES:
patent: 4742257 (1988-05-01), Carpenter
patent: 5008575 (1991-04-01), Ishimoto et al.
patent: 5630461 (1997-05-01), CoChimin
patent: 6011335 (2000-01-01), Belley
patent: 2002/0180282 (2002-12-01), Suzuki et al.
patent: 61-15544 (1986-01-01), None
patent: 2000-245124 (2000-09-01), None
patent: 2001-095199 (2001-04-01), None
Gotou Kobayashi, “An Analysis of the Cogging Torque of a DC Motor and New Reducing Technique”, IEEJ Transactions onPower and Energy, vol. 103-B, pp. 711-718, 1983.

Affiliated with

Also associated with

Rating

Rotary electric machine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rotary electric machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary electric machine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3965052