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Frequency Converter - Greencisco Industrial Co., Ltd. - Roy Solar Co., Ltd. - Variable Speed Drives - Archnet Technology Ltd -

Frequency Converter

Frequency converter use rectifiers to convert ac power line electricity into direct current. Then inductor-capacitor filters smooth its waveforms and pulse-width-modulation inverters turn it into shaped ac power with a frequency of 2 to 12 Hz. This output is used to drive motors for constant torque or (with the help of encoders) to control motor speed. frequency converters are proliferating, as they save substantial amounts of energy during motor operation â" an objective of increasing importance. Some frequency converters have built-in ac and dc brake functions to help transform kinetic energy from the application into braking power.

Greencisco Industrial Co., Ltd.

Greencisco Industrial Co. Ltd. is a leading manufacturer of UPS, solar inverter, solar power system, solar batteries, nickel cadmium batteries, nickel iron solar battery, battery charger, -48V telecom rectifier system, Telecom DC-DC converter, frequency converter, stabilizer, MPPT/PWM solar controllers. www. greencisco. com;;/Greenciscosimon

Roy Solar Co., Ltd.

Established in 2000, based in Shanghai, China, ROY SOLAR is the specialist of solar electric power for the areas where there are electricity problem, but with good sunlight power, such as Africa, South America, South-east Asia, etc. Products range: from solar charge controller LD2420C, LD2430S, LD4830S, CM3024Z, CM3048, CM5024Z, CM5048, SL1024 to Total Solar Power System Solution.

Variable Speed Drives

Variable speed drives are ONLY for 3 phase motors, any method to speed control an induction motor. Variable speed drive with ONLY single phase input can drive capacitor start/run single phase motors. Variable speed drive operating from single phase have output voltage on each phase equal to input voltage. Higher capacity single phase motors with separate high torque/high current starting winding operated by centrifugal switch can not be used with variable speed drive. However a triac speed controller may work, as this could duty cycle the AC sine wave form. Try an off the shelf light dimmer and see if this can control the desired speed range of the fans. If this works, then some circuit research/lab work could produce a circuit that takes 0...

Archnet Technology Ltd

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