Xindali Industries Co., Ltd.
since 1997，XINDALI focused on the push button switch.
The principles and characteristics of three kinds of AC speed regulating modes of elevator drive system and analyzed，there are AC double speed drive，AC variable voltage speed regulating drive and AC voltage variable frequency speed regulating drive，so as to let elevator practitioners have a deeper understanding of elevator.
Keyword：traction elevator；AC double speed drive；AC variable voltage speed regulating drive；AC variable voltage variable frequency speed regulating drive
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