4.5.2 Three-phase variable frequency drives

380v/440v three-phase variable frequency drive 

Variable frequency drives control electric motors by varying the base frequency of the network and the speed of the induction motor. 

You can find our range of three-phase variable frequency drives: 

  • Variable frequency drive VFR013: power from 0.4 kW to 1.5 kW
  • Variable frequency drive VFR015: power from 0.4 kW to 2.2 kW
  • Variable frequency drive VFR050: power from 0.4 kW to 7.5 kW and from 11 kW to 160 kW
  • Variable frequency drive VFR091: power from 0.75 kW to 7.5 kW
  • Drive with remote control VFR050: power from 11 kW to 160 kW
Find out more

What is a three-phase variable frequency drive?

A three-phase variable frequency drive varies the speed of a three-phase induction electric motor, by varying the supply frequency (between 0 and 50Hz).

The three-phase variable frequency drive enables to:

- vary the speed of an induction motor, by varying the frequency.

- start and brake progressively (by varying the acceleration and deceleration times). It is recommended when using reducers because it limits mechanical fits and starts. 

- protect electrically (thermal, against overloads) by controlling the current consumed by the motor.

We can find the drives for three-phase motors in all sectors in the industry, especially for machines having electric motors with a power between 0.4 kW and 320 kW.

Applications of variable frequency drives

The main applications of variable frequency drives are the conveyors, pumps, fans, mills. They enable to improve the process control and to optimise the operation of electric motor applications to reduce the consumption of electric energy.

Supplying a three-phase motor drive

A three-phase variable frequency drive is supplied from a 380V-400V three-phase network. 

To choose your model of drive, you need to choose a drive power greater than or equal to the power of your electric motor. 

EASI-Spare offers you a range of several variable frequency drives’ powers going from 0.4 kW to 400 kW.



How to protect your variable speed drive for three-phase motor?

A three-phase variable frequency drive has a low ingress protection rating which is IP20 (protected against solid foreign objects greater than 12.5mm but not protected against liquids).


Then, you need to pay attention to several criteria which depend on the environment of the three-phase drive. Protection and control accessories for driveare available on our website.


- The temperature of the environment must be between -10°C and 40°C.

- You need to make sure that no liquids can enter the drive (water drop, water vapour, humidity lower than 90%, rain)

- Prevent dirt, metal dust, oil, and corrosive gas from entering 

- Keep away from all sources of interference such as vibrations or electromagnetic interference, etc.

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