Vsd Variable Speed Drive - India

The Gozuk VSD -

variable speed

drives are suitable for the starting, braking, speed variation, closed-

loop control and positioning of three-phase induction motors.

Gozuk variable speed drives belong to the type of variable speed drives with a constant DC link voltage and an variable speed drive with pulse width modulation.

A two quadrant three phase bridge rectifier supplies the DC link.

A three-phase bridge connection of IGBT transistors converts the DC voltage into a three-phase voltage supply of variable frequency and voltage.

This configuration enables a four quadrant drive control, similar to the characteristic of DC drives, but without their disadvantages.

Therefore VSD is also suitable for dynamic applications.

During braking, the motive power is fed back regenerative into the supply.

A braking chopper, as required with standard variable speed drives, is not required.

The self optimizing pulse width modulation (PWM) makes use of voltage feedback in each output phase.

The switching frequency is not fixed, but statistically spread over a wide range.

Therefore the motor noise is very low.

Two adjustable speeds are provided for with VSD.

The lower speed N1 is intended for minimum speed or for commissioning or positioning, the upper speed N2 for normal operation.

The speed can be varied between these limits using an external potentiometer or with an external voltage/current source.

The available torque above base frequency falls off rapidly with increasing frequency (danger of motor stalling without speed detection).

Company Contact:

• Posted By: VFD Manufacturer

• Phone: 912267059033

• Address: Daffodil, Sepal, Sama Savli Road, Behind Gangotri, Baroda Gujarat, India

• Email:

• Website: http://www.vfds.in/

• Business Description: VFDs.
  
  in Variable Frequency Drive used to control a motor's speed or
  
  torque can net substantial energy savings.
  
  But VFDs, also known as
  
  adjustable speed drives and variable speed drives (VSD), can induce
  
  unwanted motor shaft voltages.
  
  A maintenance free, long life shaft
  
  grounding ring that protects attached equipment as well as the motor's
  
  bearings is warranted.
  
  Bearing protection for induction motors
  
  A bearing protection ring is available for any NEMA or IEC motor size.
  
  It can be factory installed inside new motors or quickly and easily retrofitted even in the field using conductive epoxy (at right).
  
  VFD, used to control a motor's speed or torque, can net substantial savings in energy costs, up to 30 percent.
  
  Because of this, they have been cited as a key technology to make industrial HVAC systems, automated assembly lines, and other processes more energy efficient.
  
  But VFD, also known as variable speed drives (VSD) and ac drives, can induce unwanted motor shaft voltages.
  
  Without effective mitigation, these electrical discharges can destroy bearings, causing premature motor failure.
  
  In fact, the costly repair or replacement of failed motor bearings can wipe out any savings that an AC drive yields and severely diminish the reliability of an entire motor driven system.
  
  And when a VFD controlled motor fails, warranty claims against motor and VFD manufacturers may not pan out.
  
  Because systems that use VFDs are so varied, the liability question is a hot potato.