Qingdao CCS Electric Corporation.
Qingdao CCS Electric Corporation.
VFD Motor

What is a VFD motor? Variable frequency drive (VFD) is a kind of power control equipment which uses frequency conversion technology and microelectronics technology to control AC motor by changing the speed of motor. The VFD is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), drive unit, detection unit, micro processing unit, etc. VFD motor is a combination of variable frequency drive and three-phase motor to be used with AC 50Hz/60Hz power supply system. The VFD motor can adjust the speed of motor under various load conditions, completely eliminate the mechanical and electrical shocks and prolong the service life of mechanical equipment. And the variable frequency drive motor also works to protect against overload, overvoltage, undervoltage, phase loss and overheating.

Types of Variable Frequency Drive Motor

VFD Motor Efficiency

Motor efficiency does change as speed and torque change and is also affected by voltage harmonics present in the VFD motor output. The magnitude of losses due to voltage harmonics will vary with the motor design. VFD motor efficiency decreases with decreasing motor load. The decline in efficiency is more pronounced with VFD motor of smaller horsepower ratings. 

How does a VFD Control Motor Speed?

A variable frequency drive controls the motor speed by using PWM (Pulse Width Modulation) to alter the power supply frequency that's fed to the motor. The first step in this process is to convert the AC supply voltage into DC by the use of a rectifier. DC power contains voltage ripples which are smoothed using filter capacitors.

How to Change Motor Rotation on a VFD?

It is usually easy to change the direction of rotation with the VFD itself. Most VFD's have a simple toggle command for forward and reverse. Switching two of the power leads coming out of the VFD can solve the problem of which the motor is shut down and later restarted, it will restart running backwards again.

Application of the VFD Motor

The VFD motor can run in the explosion environment. Flameproof and intrinsically safe high-voltage integrated VFD Motor is a highly integrated product of the motor and the drive. It is widely applicable to belt conveyors, loaders, AFC's, emulsion pumping stations, and other equipment used in underground coal mining to achieve a soft-start under heavy load and dynamic speed control. CCS can offer a wide range of VFD motors for different scenarios, including vfd for synchronous motor, VFD rated motors, VFD multiple motors, and other VFD compatible motors.

How to Select a VFD Motor

  1. Choose the appropriate structure form of protection grade motor according to the application place.

  2. Choose the appropriate power and voltage level according to the responsible ability.

  3. According to the environmental temperature, humidity, above seal level, dust and gas conditions, special requirements such as explosion prevention are selected.

  4. Choose a strong manufacturer to ensure the material quality and production process to the maximum extent.    

FAQs of VFD Motors


What is power transmission equipment?

Electrical transmission equipment can realize the conversion between electric energy and mechanical energy, and conveniently control the torque, angular acceleration, speed of the motor output shaft according to the production process requirements.

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What is the power control system?

The electric drive control system is usually composed of a motor, power conversion device, and control device. Electric drive is divided into constant speed and speed regulation, and speed regulation is divided into AC speed regulation and DC speed regulation.

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Which kind of communication protocol can be available in the system?

There are several communication methods for your choice, Modbus, Profibus, Profinet, Internet.

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How does the variable frequency drive (VFD) work for motor protection?

VFD can realize the protection of motor: 1. Overvoltage protection. 2. Undervoltage protection. 3. Overcurrent protection. 4. Lack of phase protection. 5. Reverse phase protection. 6. Overload protection. 7. Grounding protection. 8. Short circuit protection. The frequency converter is equipped with various detection systems to detect and protect various signals.

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Can you run a VFD without a motor?

The VFD can be put into trial operation without motor, which is used to carry out relevant low-voltage tests, such as analog overcurrent protection, overvoltage protection, communication failure and so on.

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What types of motors can be used with variable frequency drives?

Frequency converter usually needs to be equipped with special frequency conversion motor, because the special frequency conversion motor fully considers the problem of frequency change in design and manufacture, and can apply to larger frequency change; The traditional asynchronous motor can also be applied to frequency converter, but because it is designed according to power frequency, there are some problems such as low efficiency, high temperature, easy aging insulation and so on.

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