motor speed selection switch 马达速度选择开关
Using space vector pulse-width modulation (SVPWM) signal transformation method, speed regulation of induction motor is implemented by controlling the duty ratio of every converter switch.
利用电压空间矢量脉宽调制(SVPWM)信号变换控制功率变换器各开关器件的导通占空比，实现异步电动机的速度调节。
Comfortable and convenient operation, assembly thermal overload protection device and multi-file electronic speed constant power switch ensure high motor efficiency and durability.
操作舒适方便，装配过载过热保护装置，多档电子调速恒功开关，保证马达的高效率和耐用性。
When the acceleration period has terminated, the switch means is controlled by a PWM pulse of the duty ratio in accordance with the speed instruction data, there by driving the DC motor.
在该加速期间结束时，以占空比与速度指令数据对应的PW M脉冲来控制开关机构，从而驱动该直流马达。
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