我看不懂这段话，所以发到这让大家给帮忙翻译一下。《这段话是摘自SIMODRIVE 611 Transistor PWM Inverters for AC Feed Drives and AC Main Spindle Drives Planning Guide 08.98 Edition》
我想知道611D是不是正弦脉宽调制spwm调速？611A是方波脉宽调制？是不是这样的
The inverter power section controls the current through the individual motor windings. 1FT5 motors are fed with square–wave currents and 1FT6– and in-duction motors with sinusoidal currents.

A pulse generating logic clocks the 6 power transistors in a three–phase ori-ented pulse pattern. An optocoupler is provided in every transistor arm between the gating logic and the power section gating amplifier. These optocouplers pro-vide the electrical isolation.