VFDS LLC is a leader among variable frequency drive suppliers. Our company concentrates on inverter design and VFD manufacture. VFDS LLC is china VFDS Company located in Shenzhen. Our main focus is creating the highest quality products. The main products single phase to three phase VFD, three Phases to three Phase VFD and so on.Variable frequency drive - VFDs can be used to control the speed of a machine. There can be significant energy reduction if the machine is slowed down when it does not need to operate at full speed. For example, pumps operated so that they run at a speed dependent on the flow requirements will reduce the cavitation losses in the pump. If the pump is required to run at constant full speed, the addition of a VFD will actually waste another 5% of energy.So, at full load, we may have a VFD at 97% and the motor at say 92% (depending on size and design) and the pump (or machine) may have an efficiency of say 80% or even less, so the wasted energy in the variable frequency drive is small, The wasted energy in the motor is also relatively small. The major losses are in the driven load that is why we target the driven load.When the inverter drives motor or other inductive load during stop time, generally adopts dynamic braking, means consume the kinetic energy and the magnetic energy of the motor in the coil inside through a level of energy consumption components, in order to achieve fast stop function. When the power supply is off, the inverter circuit of the variable frequency AC drive reverses connection, and conducting these surplus energy feed back to the inverter DC bus, the DC bus voltage will be increased, and when it goes up to a certain value, the braking resistor will be put into operation, so this part of the electrical energy will be consumed by heating mode, and maintaining the voltage on the DC bus to a normal value.
