In the market of speed control units for fan drives, it is self-evident that they must work efficiently and without noise emissions. To fulfill these requirements, and to be able to offer an ideal system consisting of motors and VFDs, has developed the range of Frequency control VFDs. These VFDs with an integrated all-pole effective sinusoidal filter, enable the motor to run efficiently and free of electro-magnetic noise.
In particular, with Frequency control, parallel operation of multiple motors with one VFD is possible without problems, screened motor leads are not necessary, and cable length is not limited. Due to the sinusoidal output voltage and output current, the Frequency control VFD can also be described as an "electronic transformer".
Recognizing hazards when operating with VFDs
Due to the continuous increase in the efficiency of electronic components, the range of powerful VFDs offered on the market has significantly increased. VFDs have become less expensive and are enjoying increased popularity.
It is important to know that standard VFDs without all-pole effective sinusoidal filters have block shaped (square wave) or pulse width modulated (PWM) output voltages. As outlined in the European standard for rotating electrical machines, DIN IEC/TS 60034-17, this type of power supply waveform presents potential hazards for motor bearings and windings. In particular, small motors, like those integrated into fans, are at danger. The standard describes the increased stress on the motor windings through voltage peaks, and the hazard of bearing currents through capacitive coupled voltage, which can provoke the premature failure of the motor bearings. see more...
Contact person:Frank Chang
Street address: Building 2 Xuwu Gongle Xixiang, Bao'an District