P-0-0001 Switching frequency of the IGBT module

This parameter defines the switching frequency of the IGBT module.

Attributes

For further information please look into the involved IDN: P-0-0090 and P-0-0091

Definition IGBT:

The Insulated-Gate Bipolar Transistor (IGBT) is a three-terminal power semiconductor device primarily used as an electronic switch which, as it was developed, came to combine high efficiency and fast switching. It switches electric power. Since it is designed to turn on and off rapidly, amplifiers that use it often synthesize complex waveforms with pulse-width modulation and low-pass filters.

Definition PWM frequency:

The Pulse-Width Modulation (PWM) is a modulation technique used to encode a message into a pulsing signal. This modulation technique can be used to encode information for transmission. The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load. The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible.

The IGBT modules give a servo signal to the motor windings. This shows how often the edges of the turn-on and turn-off times are switched. The result is a sinusoidal current diagram.

What is new in Firmware 2.10:

The PWM frequency can be set from 8 KHz to 16 kHz. This change makes the turn-off times of the servo drive faster. By faster turn-off times the results is a better sinusoidal current diagram. The current will be smoother.

The smoother current, reduced the noise of the signal. The 16 kHz PWM frequencies is not audible for the human ear. Thereby the perceive noise is reduced.

The disadvantage is higher switching losses.