KEB dV/dt filters reduce the peak voltage levels seen by the motor in VFD applications. dV/dt chokes help protect the motor insulation and increase operating lifetime by reducing motor heating.
Filters and Chokes
dV/dt Filters - Motor Chokes
Product Details
KEB’s dV/dt chokes do not skew the VFD’s motor model or negatively affect motor performance. They can be used with either PM or Induction Motors.
KEB dV/dt filters can be operated safely and effectively with high output frequencies from the drive – up to 16kHz carrier frequency.
Our dV/dt motor chokes have the secondary benefit of reducing EMI emissions (>250kHz range) from the VFD output.
Tech Specs
Electrical
• Voltage class: 230 &480V
• Rated current: 22-100A in graduated sizes
• Max switching frequency: 16kHz
Certifications
• CE
• UL
Environment
• Protection type: IP20
• Climate category: 3K3 (in accordance with EN60721-3-3)
When to Use dV/dt Filters
Voltage spikes and reflected waves can happen when a VFD is paired in certain scenarios that have long cable runs, high switching frequencies, and are in high-voltage systems. This can lead to potential breakdown and a shortened motor lifetime. Installing a dV/dt filter is ideal to lower voltage spikes and improve the performance and reliability of the system.
Output Filters: dV/dt vs. Sine Wave
dV/dt Filters
• Inductor system
• Reduces voltage rise time at the motor and the temperature
• Increases the motor's operating lifetime
• Protects motor insulation
• Placed directly at the output of the drive
Sine Wave Filters
• Inductor/capacitor combination
• Low pass filter used to provide a sine wave output to the motor
• Reduces motor winding heat
• Increased motor lifetime
• Installed close to the VFD
Advantages of Using dV/dt Motor Chokes
• Increased service life of motor windings
• Reduced current ripples and rotor losses in the motor
• Suitable for applications with long motor supply cables (>30m)
• Increased total inductance at output
• Optimized the voltage rise rate (dV/dt) of the IGBT
• Reduced the peak value of the current, and relieve the IGBTs in propulsion inverters
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