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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
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正弦波驱动电机驱动IC能支持的最大转速是多少？
电机的最大转速主要由电机特性和供电电压决定。然而，它也会受IC设定的PWM控制载波频率的影响。对于正弦PWM驱动，建议的最大转速约为PWM频率的1/100或更低。
例如，使用TC78B041FNG驱动4极电机（由N极和S极两个极对组成），当电机以转速5,000rpm旋转时，正弦驱动频率如下，
5,000 rpm×2个极对/60秒＝167 Hz
当TC78B041FNG的PWM载波频率设为18kHz时，其分辨率为每正弦驱动周期108个PWM脉冲（18 kHz/167 Hz＝108）。
但是如果电机以转速15,000 rpm旋转，则正弦驱动频率如下：
15,000 rpm×2个极对/60秒＝500 Hz
分辨率为每正弦驱动周期36个PWM脉冲（18 kHz/500 Hz＝36）。
使用此分辨率，每个PWM将产生约10°相位差。
建议的分辨率为每正弦驱动周期100个或更多PWM脉冲。然而，电机仍可以低于100的分辨率旋转。在这种情况下，可能会出现波形失真或噪声。由于具体取决于电机特性，因此请确认实际电机能否实现所需的旋转性能。
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