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Variable Frequency Drive

Variable Frequency Drive
Variable Frequency Drive
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Product Code : ACE 21
Brand Name : Syguruace
Product Description

Due to the proficient efforts of our committed team of professional experts, we are able to manufacture and supply an exceptional range of Variable Frequency Drive. Incorporated with latest technology, it is used to start motor smoothly, with no inrush current, no mechanical jerk and without sacrificing the starting torque. This frequency drive is manufactured of superior quality raw materials and innovative techniques at manufacturing unit. Prior to dispatch, this Variable Frequency Drive is checked on various parameters to make certain a defect free range is delivered.


  • Easy to maintain
  • Long service life
  • Compact design
  • Advantages Of Variable Frequency Drive

  • With the help of variable frequency drive (VFD) step less, precise, stable and accurate variation of motor speed can be obtained.
  • Motor can be protected against over current, single phasing, earth fault and over temperature, by tripping the drive under these conditions.
  • Motor can be started smoothly, with no inrush current, no mechanical jerk and without sacrificing the starting torque.
  • Even if input power voltage is unbalanced, the output voltage of VFD is balanced, this avoids derating of motor due to unbalanced input voltage.
  • VFD frequency does not fluctuate even if mains frequency is varying, hence derating of motor due to frequency fluctuations is not required.
  • Motor can be stopped smoothly, by ramping down the VFD frequency, thus jerks to the motor and connected load, during stopping are avoided.
  • Motor can be accelerated or decelerated smoothly and at controllable rates. S-curves can be used during acceleration or deceleration. This avoids jerks to the motor and to the loads connected to it.
  • Dynamic braking provided in VFD helps in stopping the motor rapidly without mechanical jerks, as in case of rapid stopping through mechanical brakes.
  • Magnetic losses in motor can be saved, when it runs on light load, buy programming the VFD, so that its V/F reduces under light loading conditions.
  • VFD input maintains high power factor even if motor runs at light load resulting in poor power factor at its output.


How the disadvantages of Motor Supplied From VFD are overcome?

  • Introduction of VFD injects harmonic currents in mains. This disadvantage can be overcome by using harmonic filters, by using PWM converter in place of conventional diode rectifier, by using multi-pulse converter in place of 6-pulse converter at the input of VFD.
  • VFD output is non-sinusoidal and rich in harmonic content, it can overheat the motor. Extra-heating due to PWM waveform of output voltage of VFD, is not that prohibitive, so as to damage the motor. Even this can be avoided by providing sinus filter at the output of the VFD.
  • Introducing VFD between motor and mains leads to insertion loss of 2% to 3% as VFD itself has some losses.