Energy Industry Webinar Production & Promotion

Is your voltage selection criteria for motors and drive system the most optimal?

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Register for the Webinar to Learn

  • The changing industry practices for motor and drive selection, with specific emphasis on the voltage level selection. 

  • Why Industries are avoiding specifying a voltage for VFD driven motor and deciding on the combination which offers the optimal total system cost of ownership and ROI.

Below are some of the questions discussed during the webinar:

  • What are the challenges in selecting a drive and motor from different manufacturers?

  • How important is it to specify the number of poles for a pure VFD application?

  • While buying a VFD system, is it possible to do the testing before bringing it to the site?

  • For a ball mill application of rated capacity 6.5 MW, is it convenient to use a slip ring induction motor with an LRS application or a synchronous motor with an LCI drive? Which option will provide an optimized solution?

  • For an unearthed power supply system, what will be the phase-to-phase and phase-to-ground insulation voltage level? Will it be the same?

  • What would be the typical insulation of motor winding for a 690V VSD system?

  • Can we have a drive where the input voltage is similar to the bus voltage but the output voltage is similar to the motor-rated voltage?

  • For an extruder application of 15 MW rating, what type of motor drive system is recommended and why?

  • How do you ascertain the voltage seen at motor terminals when there are multiple runs and long-length cables between the drive and motor? Is there any test which can be carried out during FAT?

  • What will be more convenient, VSI or CSI, to use for a 240V single-phase induction motor?

  • Will there be any separate tests conducted on VFD HV motors as per the new standard IEC 60034-18-42?

  • If 550KW induction motor and the voltage available is 6.6KV, 690V, and 415V, which is convenient to use?

  • Up to what cable length from drive to motor is acceptable to avoid dv/dt or sine wave filter so that the peak phase-to-phase or phase-to-earth voltage can be limited below the insulation grade of the motor?

  • Are shielded cables mandatory for drive applications connecting the drive and motor?

  • For MV drives, does cable selection require a specific capacitance value? Why?

  • Do you have drives which can be located near the motor in the field instead of in an air-conditioned room?

  • What are the criteria for selecting the voltage of motors? If we need 200KW 1000 rpm motors, what should be the voltage of 200KW motors?

  • What is the selection criteria for the fuse and contactor in motors and circuit breakers (thermal mag and electronic) in LV motors?

  • What is the criteria and reason for selecting an AFE drive vs. DFE drive other than energy feedback from load to supply?

  • Is there any impact on motor selection (size and type of cooling) when run on VFD and vice versa?

  • Can a motor rotate in ACW and CCW direction in case of reversing the connections?

  • Is it possible to have variable speed synchronous motors?