| 摘要 |
The negative temperature dependency of the torque ripple correction capability of a known drive circuit is offset by making the amplitude of input voltage signals applied to a m-differential amplifier of the drive circuit positively temperature-dependent to improve the overall torque ripple correction capability of the circuit so that deteriorated torque ripples at low temperature and increase in the level of reactive currents at high temperature may be effectively eliminated. Moreover, since temperature induced deformation of waveforms of electric currents to be carried to soft switching coils of the drive circuit is minimized, a too rapid switching speed at low temperature is avoided to suppress generation of electric as well as mechanical noises, while too dull waveforms of electric currents at high temperature are also eliminated.
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