Switching frequency refers to how fast the PWM output switches. The servo drive switching frequency is typically held constant, and the output current is controlled by the duty cycle.
- For low inductance motors the current may rise too fast when the power devices are turned on and the current may drop too fast when the power devices are turned off; increasing the switching frequency shortens the amount of time during the on/off cycles, resulting in better current control
ADVANCED Motion Controls' Capabilities
- Off-the-shelf drives have a switching frequency typically between 16 - 25 kHz, with some drives exceeding 40 kHz
- Custom servo drives can be delivered with switching frequencies tailored to stabilize sensitive machines to avoid specific harmonics or to improve performance with a low inductance motor