Title:
METHOD OF MAKING PSEUDO SINE WAVE
Document Type and Number:
Japanese Patent JP3289828
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make pseudo sine waves with little distortion by simple method when driving stator winding by sine waves, so as to solve such a problem that using trapezoid waves for the drive of stator winding of a brushless motor or the like can reduce noise or vibration, however the torque ripple is large.
SOLUTION: A sine wave where broken lines are approximated is made by making a compensating waveform from a three-phase trapezoid waveform having a plane at 60° in electric angle, a waveform two-thirds the amplitude of the above three-phase trapezoid wave and fixed in amplitude, and a waveform one-third the amplitude of the above three-phase trapezoid wave and fixed in amplitude, and compensating the instantaneous amplitude of each phase so that the value where the above compensating waveform is added to the amplitude of the above three-phase trapezoid waveform may be the amplitude of the new three-phase waveform.
Inventors:
Yutaka Kamoki
Masao Mizumoto
Yasunori Terai
Masao Mizumoto
Yasunori Terai
Application Number:
JP12887199A
Publication Date:
June 10, 2002
Filing Date:
May 10, 1999
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
Sanyo Electric Co., Ltd.
Sanyo Electric Co., Ltd.
International Classes:
H02P6/10; H03B28/00; (IPC1-7): H02P6/10; H03B28/00
Domestic Patent References:
| JP5058531A | ||||
| JP642410A |
Attorney, Agent or Firm:
Mitsutake Murayama