Motor Protection

Protect Motors From Harmful Overvoltage and dV/dt Spikes

Motor Protection

Enerdoor developed the motor protection series to protect motors from harmful overvoltage and dV/dt spikes generated by the drive’s output.  This is particularly useful for applications with variable frequency drives and servo drives. Enerdoor solutions include common mode and differential mode chokes, sine wave filters, and snubbers; all of which are designed to work with various carrier frequencies, output frequencies, and applications.

Motors controlled by VFDs or servo drives require additional attention to avoid overvoltage spikes, known as dV/dt. Voltage wave reflection is a function of the voltage rise time (dV/dt) and the length of the motor cables. This phenomenon creates additional overvoltage spikes which cause premature degradation and failure to the motor insulation.  The challenge for OEMs, system integrators and distributors is to ensure the installed motors are well protected from overvoltage. 

Benefits of Enerdoor Motor Protection:

  • Increase motor life
  • Includes common mode and differential mode inductance, sine wave filters, and snubbers
  • Protect motor windings, insulation and bearings
  • Protect against voltage spikes on the motor 
  • Works with various carrier frequencies, output frequencies, and applications
  • Output frequencies up to 3 kHz using high-performance material that run at ambient temps
  • Pass European emission Standards; Carries CE and UL approvals
  • Reduce motor temperature; very low power loss
  • High linearity vs frequency and current

For more information, please visit: Motor protection application

Browse Motor Protections

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FIN47SNB Snubber dV/dt Filter
  • Nominal voltage 600 Vac
  • Reduces dV/dT
  • Remote contact indicator
  • Compact dimensions due to the parallel installation
  • Only one model for unlimited HP motors

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FIN5955 Output Filter
  • Differential mode impedance
  • Rated currents from 3 - 20A
  • Nominal voltage 600 Vac
  • Low power loss up to 250 Hz frequency output
  • Protects against voltage spikes on the motor

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FIN5980P Output Filter
  • Rated currents from 9 - 22A
  • Nominal voltage 480 Vac
  • Differential mode impedance
  • Eliminates dV/dt
  • Overvoltage spikes regenerate into the DC bus
FIN5980P

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FIN5983 Output Filter
  • Rated currents from 12 - 60A
  • Nominal voltage 600 Vac
  • Differential mode impedance
  • Eliminates dV/dt
  • Footprint with drives manufacturers

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FIN900 Output Filter
  • Common mode impedance
  • Rated currents from 10 - 280A
  • Nominal voltage 600 Vac
  • High impedance
  • Reduces high frequency interference (PWM)
  • Cable/screw connections available
FIN900.(010 - 030).C

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FIN905SF Sine Wave Filter
  • Three phase sine wave filter
  • Rated current from 5 - 880A
  • Nominal voltage 600 Vac
  • Reduces dV/dt
  • Increases motor life

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FIN915SFH High Frequency Sine Wave Filter
  • Currents rated from 5 - 1100A
  • Nominal voltage 600 Vac
  • Reduces dV/dt
  • Increases motor life
  • Very low heating for high frequency applications

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FIN930 Output Filter
  • Common mode impedance
  • Rated currents from 6 - 200A
  • Nominal voltage 600 Vac
  • Low impedance
  • Reduces dV/dt
  • Increases motor life

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FIN950U Load Reactor Filter
  • Rated current from 8 - 300A
  • Nominal voltage 600 Vac
  • Frequency range 0 - 100 Hz
  • Insulation class H

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FIN958 Output Filter
  • Rated current from 12 to 110A
  • Nominal voltage 600 Vac
  • Protects against voltage spikes to the motor
  • Low power loss output frequency up to 1 kHz

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FIN960F Output Filter
  • Rated currents from 10 - 1000A
  • Nominal voltage 750 Vac
  • High frequency application
  • Synchronous electrospindle application
  • No heating on the core
  • High linearity versus frequency

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FINSTP Star Point Snubber
  • Nominal voltage 600 Vac 
  • Reduces dV/dt star point - PE
  • Very low power loss 
  • Easy installation
  • Protects motor windings, insulation and bearings

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FINTR Toroid and FINFE Ferrite
  • Ferrite core
  • Very high permeability ferrite
  • Plastic covers protect against accidental contact
  • Available in different sizes

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