Sine Wave dv/dt Filters
MVAlso Available For Medium Voltage
Sine Wave dv/dt Filters (Type SWF) 200-690 volts, 50/60Hz
APPLICATION: Motors that are controlled by variable frequency drives are subjected to higher stresses and losses caused by PWM voltage and become especially vulnerable to premature failure when the cable lengths between VFD and motor are long. Typical applications include submersible pumps, air handling units, irrigation, municipal water, lift stations, water treatment, etc. Inverter output Sine wave filters can also be used to improve voltage quality from alternative energy inverter power sources.
Type SWF Filters
Type SWF Filters convert Pulse Width Modulated (PWM) voltage, produced by a typical inverter, to a sine wave without any dv/dt concerns. They eliminate restrictions on cable length, eliminate harmful pulse voltage reflected waves and improve motor performance and life expectancy in AC variable frequency drive installations. Arteche offers a complete range of standard filters based upon typical motor full load ampere (FLA) ratings and PWM switching frequency, however, we will gladly produce a customized filter for your exact application requirements.
Standard filters are available for PWM switching frequencies of 5kHz and higher,
2-2.5kHz, 4kHz, plus we can produce a filter for any PWM frequency you need.
Typically, motors connected to power systems of 380V and higher are most likely to be exposed to sufficiently high reflected waves that can cause premature failure from peak overvoltage or a high dv/dt rate. The motor protection alternative technique varies depending upon voltage level, cable length and even the voltage pulse rise time (function of the IGBT transistors used in the inverter). However, for protection of submersible motors, it is necessary to use a sine wave filter.
|Motor||Motor Cable Length|
|100 ft||300 ft||500 ft||1,000 ft||15,000 ft|
|230 V motors||4-5% Impedance||4-5% Impedance||4-5% Impedance||5% Impedance||n/a|
|400 V motors||4-5% Impedance||4-5% Impedance||5% Impedance||SWF||SWF|
|460 V motors||4-5% Impedance||4-5% Impedance||SWF||SWF||SWF|
|575 V motors||SWF||SWF||SWF||SWF||SWF|
|690 V motors||SWF||SWF||SWF||SWF||SWF|
Arteche Sine Wave Filters are superior to typical dv/dt filters which many times only clamp the harsh PWM voltage instead of returning the voltage to a near sine wave - the voltage the motor was intended to utilize. Our Type SWF filters will eliminate the threat of excessive peak voltage and protect motor windings for any and all cable lengths.