Because the most torque an electric motor has is at zero speed.
因为电动马达的最大力矩处于零速度。
High torque, low noise, planetary gear motor.
大力矩，低噪音，行星齿轮减速电机。
The other is a small torque motor output, maintain a high speed.
另一种是要求马达输出小转矩，保持高转速。
The other is a small torque motor output, maintain a high speed.
另一种是要求马达输出小转矩，保持高转速。
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