Motor chokes

Motor chokes

More performance with REO Motor Chokes

Reduction of symmetric and asymmetric flow distortions , which are generated at the connecting line between the inverter and the motor due to the fast switching of the power semiconductors .

These disturbances can affect the performance of the engine by loud noises, and in extreme cases, by overheating. Here , a conventional motor choke can help. Thanks to their  design,  the motor choke can fulfill higher requirements than the dv/dt choke .

The voltage increase is limited to less than 500V / .mu.s. The voltage peaks of the conductor - conductor - voltage on the motor are less than 1000V. The motor choke dampens conducted interferences in lower frequency range, too. The losses and the typical noise in the motor plate can be reduced .

  • CNW 854

    Three-phase motor choke

    CNW 854
    • Nominal Voltage: 500 V
    • Rated current: 2 - 1200 A
    • Inductance per strand: 0,013 - 7 mH

    Voltage rise (<200V / us) and distortion reduce - protect electrical consumers optimally.


    In addition to the increase of voltages, there is a considerable amount of symmetric and asymmetric current distortions which are generated at the motor cable through the fast switching of the power semiconductors. These are becoming more pronounced with increasing cable length. These disturbances can affect the performance of the engine by loud noises, and in extreme cases, by overheating. Here, a motor choke remedy. The motor choke reduces the voltage rise and the voltage spikes between the conductors. Furthermore, the current is smoothed.


    Losses and heating are minimized and the leakage current reduced. Longer motor cable lengths are possible. By limiting the rate of voltage rise, the motor insulation is protected and thus prolongs the life. The motor choke also attenuates the conducted interference in lower frequency range very good. The losses and the typical noise in the motor plate can be reduced. Voltage rise (<200V / us) will be reduced.


    Increasing the service life of motors, reduction of edge steepness dv/dt to earth and between phases, reduce motor noise, current smoothing.



    • Rated voltage: U ≤ 3 x 500 V

    • Reduce the voltage rise dv / dt to <200V / us

    • Field frequency: 0 - 60 Hz

    • Drive switching frequency: up to 150 A >4kHz, from 150 A >1,5KHz

    • According to: EN 60289 / EN 61558

    • Test voltage: L-L 2500 V, AC/50Hz 60s; L-PE 2500 V, AC/50Hz 60s

    • Insulation class: T40/F

    • Protection rating: IP00

    • Climatic categorie: DIN IEC 60068-1

    • Overload: 1,5 x INenn 1 min / h

    • Ambient temperature: 40 °C

    • Design: standing on foot angle


     


    Typical applications



    • Drive systems for motor drives:


      • Mechanical engineering

      • Elevators / escalators

      • Pipes

      • Conveyor technology

      • Ventilation and air conditioning

      • Robotics

      • Automation technology


    • Power supplies

    • Wind turbines

  • CNW M 854

    Fully encapsulated three-phase motor choke

    CNW M 854
    • Nominal Voltage: 500 V
    • Rated current: 2 - 37 A
    • Inductance per strand: 0,4 - 7 mH

    Voltage rise (<200V / us) and distortion reduce - protect electrical consumers optimally.


    Motor chokes in fully encapsulated version are specially designed for rough environments and offer a very good mechanical protection of the component. The fully encapsulation allows design up to protection ratings IP 66.


    Losses and heating are minimized and the leakage current reduced. Longer motor cable lengths are possible. By limiting the rate of voltage rise, the motor insulation is protected and thus prolongs the life. The motor choke also attenuates the conducted interference in lower frequency range very good. The losses and the typical noise in the motor plate can be reduced. Voltage rise (<200V / us) will be reduced.


    Increasing the service life of motors, reduction of edge steepness dv/dt to earth and between phases, reduce motor noise, current smoothing.



    • Rated voltage: U ≤ 3 x 500 V

    • Reduce the voltage rise dv / dt to <200V / us

    • Field frequency: 0 - 60 Hz

    • Drive switching frequency: up to 150 A >4kHz, from 150 A >1,5KHz

    • According to: EN 60289 / EN 61558

    • Test voltage: L-L 2500 V, AC/50Hz 60s; L-PE 2500 V, AC/50Hz 60s

    • Insulation class: T40/F

    • Protection rating: IP00-IP65

    • Climatic categorie: DIN IEC 60068-1

    • Overload: 1,5 x INenn 1 min / h

    • Ambient temperature: 40 °C

    • Design: standing on foot angle


     


    Typical applications



    • Drive systems for motor drives:


      • Mechanical engineering

      • Elevators / escalators

      • Pipes

      • Conveyor technology

      • Ventilation and air conditioning

      • Robotics

      • Automation technology


    • Power supplies

    • Wind turbines

  • CNW MD 835

    Liquid-cooled 5-limb-motor choke

    CNW MD 835
    • Nominal Voltage: 500 V
    • Rated current: 450 - 700 A
    • Inductance per strand: 0,02 - 0,042 mH

    Common problems at the inverter - reduce weight and volume.


    In addition to the typical problems at the inverter like voltage rise, symmetrical and asymmetrical current distortions, there is also the problem of common mode noise in multilevel inverters. In operation with common-mode interference occurs already at low currents to strong warming and in nominal operation can lead to the destruction of the choke.


    The motor choke CNW 835 reduces the voltage rise and the voltage spikes between the conductors. Furthermore, the current is smoothed; losses and heating are minimized and the leakage current reduced. Longer motor cable lengths are possible. By limiting the rate of voltage rise, the motor insulation is protected and thus prolongs the life. The motor choke also attenuates the conducted interference in lower frequency range very good. The losses and the typical noise in the motor plate can be reduced. 


    Voltage rises (<500V / us) will be reduced.


    Increasing the service life of motors, reduction of edge steepness dv/dt to earth and between phases, reduce motor noise, current smoothing.



    • Rated voltage: U ≤ 3 x 500 V

    • Reduce the voltage rise dv / dt to < 500V/µs

    • Field frequency: 0 - 60 Hz

    • Drive switching frequency: up to 150 A >4kHz, from 150 A >1,5KHz

    • According to: EN 60289 / EN 61558

    • Test voltage: L-L 2500 V, AC/50Hz 60s; L-PE 2500 V, AC/50Hz 60s

    • insulation class: T50/F

    • Protection rating: IP00

    • Climatic categorie: DIN IEC 60068-1

    • Overload: 1,5 x INenn 1 min / h

    • Ambient temperature: 40 °C

    • Design: standing on foot angle



    Typical applications



    • Smoothing of current and voltage in regenerative converters

    • Damping of common-mode interference

  • CNW MD 854

    Liquid-cooled three-phase motor choke 2% Uk

    CNW MD 854
    • Nominal Voltage: 400 V
    • Rated current: 200 - 1200 A
    • Inductance per strand: 0,012 - 0,074 mH

    Voltage rise (<200V / us) and current distortions reduce - protect electrical consumers optimally. The motor choke reduces the voltage rise and the voltage spikes between the conductors. Furthermore, the current is smoothed.


    By efficiently cooling the power losses is dissipated up to 80% in cooling and reduces heating of switching cabinets. The targeted derivative of the losses via the cooling circuit prevents that losses are discharged into the environment. By using water cooling the temperatures in the components can be reduced greatly - this means less stress for the insulation materials and a longer service life.


    Losses and heating are minimized and the leakage current reduced. Longer motor cable lengths are possible. By limiting the rate of voltage rise, the motor insulation is protected and thus prolongs the life. The motor choke also attenuates the conducted interference in lower frequency range very good. The losses and the typical noise in the motor plate can be reduced. Increasing the service life of motors, reduction of edge steepness dv / dt to earth and between phases, reduce motor noise, current smoothing.



    • Rated voltage: U ≤ 3 x 400 V

    • Reduce the voltage rise dv / dt to < 200V/µs

    • Field frequency: 0 - 60 Hz

    • Drive switching frequency: up to 150 A >4kHz, from 150 A >1,5KHz

    • According to: EN 60289 / EN 61558

    • Test voltage: L-L 2500 V, AC/50Hz 60s; L-PE 2500 V, AC/50Hz 60s

    • Insulation class: T40/F

    • Protection rating: IP00

    • Climatic categorie: DIN IEC 60068-1

    • Ambient temperature: 40 °C

    • Cooling medium: Water/Glycol (70/30 %)

    • Max. Coolant outlet temperature: 50° C

    • Flow rate: min. 3,6 l/min.

    • Pressure drop: <0,5 bar


     


    Typical applications



    • Drive systems for motor drives:


      • Mechanical engineering

      • Elevators / escalators

      • Pipes

      • Conveyor technology

      • Ventilation and air conditioning

      • Robotics

      • Automation technology


    • Power supplies

    • Wind turbines

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