This again results in long lead lengths to the motor. In some plant applications, the motors can withstand the harsh environment but the sensitive variable frequency drive cannot. As a result, the distance between the drive and the motor creates long motor lead lengths. For deep wells or mines, the motors are usually controlled on the surface. A waveform with increased harmonics at higher frequencies is the result of these much faster switching devices, often at frequencies of a few kHz.ĭrives and motors often need to be separated by significant distances. The advent of pulse width modulated (PWM) inverters with IGBT high-speed transistors, has resulted in smaller more cost effective drives and increased switching speeds. Frequently Asked Questions DV DT Reactors
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