This is ac motor parts and functions pdf good article. Follow the link for more information.
VFDs are used in applications ranging from small appliances to large compressors. VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software. Motors that are designed for fixed-speed operation are often used. AC line input to AC inverter output. AC voltage output using the inverter’s active switching elements. Controller advances have exploited dramatic increases in the voltage and current ratings and switching frequency of solid-state power devices over the past six decades.
VFDs as an inverter switching device. Hz control is sub-optimal in high-performance applications involving low speed or demanding, dynamic speed regulation, positioning, and reversing load requirements. Hz and above rated nameplate speed. Wound-rotor synchronous motors and induction motors have much wider speed range.
Wound-rotor synchronous motors can be run at even higher speeds. The mechanical strength of the rotor limits the maximum speed of the motor. VFD, motor, and driven equipment. The operator interface provides a means for an operator to start and stop the motor and adjust the operating speed. An operator interface keypad and display unit is often provided on the front of the VFD controller as shown in the photograph above. The keypad display can often be cable-connected and mounted a short distance from the VFD controller. VFD to be configured, adjusted, monitored, and controlled using a computer.