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Servo Drive & Motor Expert | VFD AC Drive Repair

Posted on 18th Dec 2023

Lenze & KEB VFD for Motors

KEB Drive by CM Industry Supply Automation

Lenze & KEB Variable Frequency Drive (VFD) is a device used to control the speed of an electric motor by adjusting the frequency and voltage of the power supplied to the motor. This allows for variable speed control, energy savings, and improved process control in various industrial and commercial applications. CM Industry Supply Automation Lenze Drive & Keb Drive supplier share some key points about VFDs for motors:

Speed Control:

Frequency Control: VFDs control motor speed by adjusting the frequency of the electrical power supplied to the motor. The relationship between motor speed and frequency is direct: higher frequency results in higher speed.

Voltage Control: In addition to frequency control, VFDs may also adjust the voltage supplied to the motor to maintain the desired torque at different speeds.

Energy Savings:

VFDs can lead to significant energy savings by allowing motors to operate at variable speeds. In many applications, motors are oversized to handle peak loads. With a VFD, motors can run at reduced speeds during periods of lower demand, consuming less energy.

Soft Start and Stop:

VFDs provide a soft start and stop for motors, gradually ramping up or down the speed to reduce mechanical and electrical stress. This helps in extending the lifespan of the motor and other connected equipment.

Process Control:

VFDs enable precise control over motor speed, allowing for better control of processes in applications such as manufacturing, HVAC systems, and water treatment.

Dynamic Braking:

Some VFDs include dynamic braking capabilities, allowing the motor to decelerate quickly. This is useful in applications where rapid stopping or reversing of the motor is required.

Overload Protection:

VFDs often include features like overload protection, which can help prevent damage to the motor in the event of excessive load or other issues.


VFDs can be applied to various types of motors, including induction motors and permanent magnet motors. However, the type and size of the motor should be compatible with the VFD.

Installation Considerations:

Proper installation and sizing of the VFD are crucial for optimal performance. The VFD should be matched to the motor's specifications, and appropriate protection measures should be in place.

Harmonics and Line Disturbances:

VFDs may introduce harmonics and electrical disturbances to the power system. Proper filtering and other mitigation techniques may be necessary to address these issues.

When selecting and installing a VFD, it's essential to consult the manufacturer's guidelines and work with qualified professionals such as CM Industry Supply Automation Lenze & Keb F5 Drive supplier to ensure proper setup and integration with the motor and the overall electrical system.