placeholder · competitor · selectelectricalent.comDV/DT Filters
A dV/dt filter is a compact L-R-C output filter fitted between a PWM drive and its motor to slow the rate of voltage rise (dV/dt) and clip the reflected-wave overvoltage spikes produced by fast IGBT switching.
Overview
A dV/dt filter is a compact L-R-C output filter fitted between a PWM drive and its motor to slow the rate of voltage rise (dV/dt) and clip the reflected-wave overvoltage spikes produced by fast IGBT switching. Those spikes — amplified by cable length between drive and motor — age the motor winding insulation and cause premature failure (existing site); the filter limits the rate of rise (typically to around 1,000 V/µs on a 480 V system) and peak voltage, protecting the windings while adding negligible loss and not degrading drive dynamics. ACE's design (existing site) is a 3-phase, 3-wire unit using a series line reactor plus an R-C snubber. Buyers choose a dV/dt filter over a full sine filter when motor cable runs are short-to-medium, when a low-cost, low-loss, compact solution is preferred, and when only motor-insulation protection (not a fully sinusoidal output) is required.
Specifications
| Technology | dV/dt filtering, L-R-C (series reactor + R-C snubber) (existing site) |
|---|---|
| Type | 3P3W, 3-phase (existing site) |
| Operating voltage | 500 VAC ±10%, 3-phase (existing site) |
| Rated current | 10 to 550 A @ 40°C (existing site) |
| System frequency | 1 Hz - 50 Hz (existing site) |
| Switching frequency | 2-6 kHz depending on motor cable length (existing site) |
| Ambient temperature | -20°C to +45°C (existing site) |
| Duty | continuous; overload 150% for 1 minute, once per hour (existing site) |
| Protection | IP00 (existing site) |
| Construction | chokes to IS 2026 / IEC 60076-6, terminals to IEC 60947-7-1, flux density 0.6 T @ 50 Hz (existing site) |
| Function | limits output dV/dt and peak voltage (typ. ~1,000 V/µs on 480 V); low impedance / low voltage drop to motor (existing site) |
Applications
- Motor-drive applications with short-to-medium cable length (existing site)
- Submersible pumps (existing site)
- Elevators, hoists and cranes (existing site)
- HVAC equipment using motor drives (existing site)
- Motor drives for process lines / high-dynamic operations (existing site)
- Protection of motor winding insulation from IGBT voltage spikes (existing site)
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