Split-phase or resistance-split-phasemotor, Electrical Engineering

Q. Split-phase or resistance-split-phasemotor?

Split-phase or resistance-split-phasemotors: Split-phasemotors have two statorwindings (amainwinding and an auxiliarywinding)with their axes displaced 90 electrical degrees in space. As represented schematically in Figure (a), the auxiliary winding in this type of motor has a higher resistance-to-reactance ratio than the main winding. The two currents are thus out of phase, as indicated in the phasor diagram of Figure (b). The motor is equivalent to an unbalanced two-phase motor. The rotating stator field produced by the unbalanced two-phase winding currents causes the motor to start. The auxiliary winding is disconnected by a centrifugal switch or relaywhen themotor comes up to about 75%of the synchronous speed.The torque-speed characteristic of the split-phase motor is of the form shown in Figure (c). A split-phase motor can develop a higher starting torque if a series resistance is inserted in the starting auxiliary winding. A similar effect can be obtained by inserting a series inductive reactance in the main winding; this additional reactance is short-circuited when the motor builds up speed.

116_Split-phase or resistance-split-phasemotor.png

Posted Date: 6/28/2013 2:19:42 AM | Location : United States







Related Discussions:- Split-phase or resistance-split-phasemotor, Assignment Help, Ask Question on Split-phase or resistance-split-phasemotor, Get Answer, Expert's Help, Split-phase or resistance-split-phasemotor Discussions

Write discussion on Split-phase or resistance-split-phasemotor
Your posts are moderated
Related Questions
#Explain charging and discharging of the capacitor ..


how back emf is produced in transformer?

What is the clock frequency of 8086? Internal clock Frequency 5 MHz 8MHz  External Clock Frequency 15MHZ 24MHZ

Q. Show Typical performance parameters for voltage regulators ? Typical performance parameters for voltage regulators are · Line regualtion · Load regulation · Tempara

Q. Consider a full-wave single-phase bridge recti?er circuit with dc motor load, as shown in Figure (a). Let the transformer turns ratio be unity. Let the load be such that the

Q. Determine the synchronous speed in revolutions per minute and the useful torque in newton- meters of a 200-hp, 60-Hz, six-pole synchronous motor operating at its rated full load

#question what are the types of lines used there and their application ..

Importance of Voltage Quality - KPI The voltage quality has a growing economic impact on the customer and the network operators. The costs related along with "lack of quality"

Voltage Quality Standards - KPI The term voltage quality (or power quality) is an umbrella concept for a variety of disturbances within a power system. The quality of delivere