Q: Can I stop the AC servo spindle motor by cutting the Enable signal of AC servo spindle drive?

A: No, the spindle motor just lost control when you cut the Enable signal, it is not braking.

AC servo spindle drive specification:

http://www.cncmakers.com/cnc/controllers/Spindle_Motor_Driver/DAP03_Spindle_Motor_Drivers.html

AC servo spindle motor specification:

http://www.cncmakers.com/cnc/controllers/Spindle_Motor_Driver/ZJY208_ZJY265_Spindle_Motors.html