Output Filter and Reactor

Output Reactor Overview

The main function is to compensate for the effect of charging and discharging of the coupling capacitor when the motor is running on long cables to avoid drive over-current. It has two types: iron core reactor and ferrite reactor, which are suitable for different carrier frequency ranges. By increasing the cable distance from the drive to the motor, the output reactor effectively suppresses the instantaneous high voltage generated when the IGBT module is switched on and off, and reduces the adverse effect of this voltage on the cable insulation and the motor. At the same time, use thick or unshielded cables can also enhance the insulation strength.

Output Filter Overview

Add a filter, a sinuous filter for example to the output side of the drive to ensure that the output voltage and current waves are nearly sinusoidal, so that to reduce the motor harmonic distortion factor and insulation stress. It can effectively filter out the high harmonics in the output current, reduce the additional torque caused by high-frequency harmonics, and reduce the temperature rise and noise from the motor. Moreover, it can effectively inhibit the surge voltage from the drive to protect the motor, and improve the power factor of the frequency conversion speed control system.

Difference Between Reactor and Filter

In short, reactors protect motors and cables by limiting instantaneous high voltages and compensating for the effects of cable length, while filters improve the waveforms of output voltages and currents to reduce the effects of harmonics on motors. In frequency conversion systems, each device plays a crucial role. Please select the appropriate equipment based on specific application requirements and conditions.

Drive Output Solution

Shielded Cables

• Use shielded cables on AC drives to avoid interference to other appliances.
• A larger cable cross-sectional area enhances the cable capacity and reduces the impact of voltage drops and current fluctuations on the motor.

Lowered Carrier

Properly reduce the carrier frequency of the drive to minimize the damage to the motor insulation due to the peak voltage in each cycle.

Output Reactor

Add a reactor to the output side of the drive to effectively suppress the voltage rise rate and peak voltage, so as to reduce the voltage reflection and current waveform distortion, to weaken the damage to the motor insulation.

Output Filter

Add a dv/dt and VPL filter or a sinusoidal filter to suppress voltage and current fluctuations and interference to the motor.

Separate Signal and Power Llines

Signal lines are not arranged in parallel with power lines to minimize electromagnetic interference.

Ground and Shielding

A good grounding and shielding is ensured to reduce electromagnetic interference signals effectively for normal operation.

Separate Drive and Motor

Separate the stepper motor from the drive to reduce the mutual influence of electromagnetic interference signals.