Variable frequency drive for motors - VFD
Variable frequency drive for motors For Sale, Most Competitive Price, Fast Delivery, Custom Service, Wholesale Variable frequency drive for motors, Made in China, High Quality Products!, China Variable frequency drive, VFD Supplier, Manufacturer.
The ideal solution would be a low-cost, maintenance-free device that safely redirects shaft currents along a very-low-impedance path from shaft to ground (protecting connected equipment as well as bearings). This device could be installed by the motor manufacturer or retrofitted in the field in virtually any variable frequency drive application. One device that meets all these criteria is the AEGIS? SGR Bearing Protection Ring from Electro Static Technology, a relatively recent invention that overcomes the problems of conventional grounding brushes. The ring works with virtually no friction or wear and is unaffected by dirt, grease, or other contaminants. A few manufacturers have introduced motors with bearing protection rings already installed, but at this writing such motors are the exception, not the rule.
The use of nonconductive ceramic balls prevents the discharge of shaft current through this type of bearing. As with other isolation measures, shaft current will seek an alternate path to ground. This technology is very costly, and in most cases motors with ceramic bearings must be special ordered and have long lead times. In addition, because ceramic bearings and steel bearings differ in compressive strength, ceramic bearings must be resized in most cases to handle mechanical static and dynamic loadings.
Variable frequency drive
Address: Galaxywind Building, No. 5 Xinxi Road, North Area High-tech Industrial Park, Nanshan, Shenzhen, Guangdong, China, 518000
Tel: 0086-139-28480241
We have more than 10 years practical experience in VFD drives producing in Shenzhen China.
VFD drives, also known as ac drives and VFDs, are widely used in HVAC systems, pumps and conveyors. An ac drive controls the rotational speed of an electric alternating current (AC) motor by adjusting both voltage and frequency of the electrical power supplied to the ac motor.
The efficient way of cutting down the electricity cost on these motors is to adjust the frequency or speed of operation for the ac motor when big power AC motor is being used. It is the general purpose of the variable frequency drives (VFD) being used for. Electric motors that do not adjust their frequency are limited to operate at the maximum frequency all the times, even when not so much power demand. The ability to adjust the frequency when less power is needed, and also can achieve full power running of the motor can improve efficiency, electricity savings, and optimize the motor-driven process. The energy savings from a frequency inverter can be dramatic, with common energy savings of fifty percent or more. Another advantage of using variable frequency drive is their ability to extend the speed range of the ac motor by being able to have adjustable frequency up to 4000 Hz rather than the normal maximum of 50/60 Hz. However, operation of motors at speeds above their rated operating speeds must be checked and approved by the motor manufacturer. Most ac drives are often programmable and allow the operator to select the conditions that are most suitable for their particular application.
