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

Assignment Help:

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


Related Discussions:- Split-phase or resistance-split-phasemotor

By the nodal analysis find the current delivered, By means of nodal analysi...

By means of nodal analysis, find the current delivered by the 10-V source and the voltage across the 10- resistance in the circuit shown in figure.

Electric helicopter, examples in building electric helicopter using cardboa...

examples in building electric helicopter using cardboard, balsa wood, scotch tape, glue, binder clips, rubber bands, rubber stoppers, etc. attached to a 12v power supply

Matlab, fast decoupled program

fast decoupled program

Induction motor, A 100hp,460v,8pole,60hz,star connected 3phase IM runs at 8...

A 100hp,460v,8pole,60hz,star connected 3phase IM runs at 891rpm under full load what is the speed of the rotor field relative to i)rotor structure ii)stator rotating field

Lack of accountability - high technical usage, Lack of Accountability - Hig...

Lack of Accountability - High Technical Usage In huge, complex and widespread ST&D networks such as ours, the subsequent factors pose problems in arriving at reasonable estima

Bonding forces and energy bands in solids, Bonding Forces and Energy Bands ...

Bonding Forces and Energy Bands in Solids Electrons are controlled to sets of discrete energy levels in atoms, with large gaps among them in which no energy state is obta

Explain the sequential circuits, Explain the Sequential Circuits? The L...

Explain the Sequential Circuits? The Logic circuits whose outputs, at any instant of time, depends not merely the present input but as well the past output called sequential ci

Generation of wide-band fm, Generation ofwide-band FM can be done by vario...

Generation ofwide-band FM can be done by variousmeans.However, only themost common and conceptually the simplest one, known as the direct method, is considered here. It employs a

Define electrical power, Electrical power Power P in an electrical circ...

Electrical power Power P in an electrical circuit is given by the product of potential difference V and current I. The unit of power is the watt, W.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd