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Diffrence between semi closed and open slots dc machine


Completely closed rotor-slots are usually economically impossible, in woundrotor motors, because of the cost of threading the insulated rotor-conductors from end-to-end through the closed slots, and the cost of making the end-connections thereafter.
5 is first started up from the supplyline 20, after which the main induction motor 10 is usually energized from the supply-line.
Consequently, such a motor, designed for longsustained operation at high slip, would have to have more copper in the rotor, or a greater amount of subdivision which would still further increase the poor-insulation factor, all of which would result in a considerable increase in the.So, leakage will flux will be very high.The primary object of my invention, therefore, is to produce a large wound-rotor induction motor having a fully open-slot rotor-construction, thus reducing the size of such machines and their manufacturing cost, and improving the performance or operation of such machines, particularly in regard to the.It is less sensitive and also has no abnormal heating during the starting.The air gap in magnetic circuit causes flux to complete it's roulette wheel 3d model free path through rotor.A wound-rotor asynchronous machine having a stator member comprising a magnetizable core having fully open slots, a polyphase primary winding having pre-formed coils insulated for an 6 operating voltage of more than 2,000 volts and lying in said stator-slots, and a rotor member comprising.
The slip ring motor has low power factor as compared to squirrel cage motor.
The four layers can be connected in series, that is, for example, two coil-sides of one slot may be connected in series with two coil-sides in different layers of another slot; or the four layers may be connected into two parallel-connected windings, in which.
Defintion, the rotor of the motor is constructed as a slip ring type.
The three finish terminals are connected forming star point, and the three start terminals are connected to three copper slip rings fixed on the shaft.
Rarely 5 10 slip ring motors are used in industries because it has several disadvantages like it required frequent maintenance, having a high copper loss, etc.
The rotor is wound for the same number of poles as that of the stator.
A wound-rotor asynchronous machine, adapted to have a high range of speed-control, i5 when operated under doubly-fed conditions, said machine having a stator member comprising a magnetizable core having fully open slots, a polyphase primary winding having pre-formed coils insulated for an operating voltage.For starting the slip ring motor the rotor resistance starter is used, whereas the slip ring motor does not require any starter.The rotor winding 24 is unique, in machines of this class, in having wide-open slots 22, so that each rotor winding-conductor or bar, with its surrounding insulation, occupies the full width of the rotor-slot in which it is placed, the rotorwinding being retained, in its.The rotor slots are not parallel but are skewed.It increases the rotor resistance due to the increased length of the rotor bar conductors.It consists laminated cylindrical core which has a semi-closed slot at the outer periphery and carries three-phase insulated winding.3, will now readily be understood.Reactance, what is it?



The direct-current generator 46 has a main armature-winding which is provided with a commutator 51 from which a direct-current circuit 52 leads to the commutator 53 of a direct-current motor 54, which may be provided with field-windings 47 similar to the direct-current generator.

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