Brushless motor
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United States of America Patent
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N/A
Issued Date -
N/A
app pub date -
Oct 23, 2007
filing date -
Apr 28, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
To reduce the occurrence of vibration without any need for adding an electronic component, changing an existing layout space, and the like. In each of magnetic pole teeth 42 of yokes 41a to 41d, a ratio of a length of a side 44c, which is a tip portion, to a width b of a root portion is 65% or more, and a ratio of its height h to the width b of the root portion is not less than 90% nor more than 110%, and its maximum width in a circumferential direction is set to a value within 30 degrees in terms of mechanical angle, and this enables a change in an amount of magnetic flux interlinked with a stator coil, so that a waveform of induced voltage of the stator coils 31a, 31b can be corrected to a form restraining the generation of a torque causing the occurrence of the vibration, and vibration level is by far lower than conventional vibration level.
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