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There is no real commercial advantage either. That means the flux density in the iron remains the same, so shaft torque and starting curve is the same. Star connection reduces the volts per phase, so in design, the turns are reduced proportionately and the conductor size increased proportionately. In fact the reason we use Star connection on higher voltage machines is to drop the Volts per pole. What happens if we use silicon steel core in induction motor for path of flux instead of air gap? Hello I want to know how we can defined the turn ration between the primary and secondary in induction motors. So cables for motor are sized for this current that is what it draws in delta connection.
How to calculate motor winding data full#
When it goes to delta again voltage is full line voltage so current increase even though it is lesser than the line current it remains higher than the line current drawn in star connection at reduced voltage. In case it is having star delta starter than they are started as Star connected motor.
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The ratio of primary frequency to the secondary frequency is called slip. The induced EMF would not be in proportion to number of turns ratio but product of turn ratio and frequency. If at all secondary of a transformer is mounted on shaft set at bearings the rate of cutting of mutual magnetic flux with secondary circuit would be different from primary and their frequency would be different.
How to calculate motor winding data free#
Other difference is that the secondary winding and core is mounted on a shaft set in bearings free to rotate and hence the name rotor. In an alternating flux machine frequency of induced EMF in primary and secondary side is same where as frequency of rotor EMF depends on slip.
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There is no air gap between primary and secondary of transformer where as there is a distinct air gap between stator and rotor of motor which gives mechanical movability to motor. In transformer the flux produced is time alternating and not rotating. Rotating flux is only possible when 3 phase voltage or poly phase which is degree apart in time is applied to a three phase winding or poly phase winding degree apart in space then a three phase rotating magnetic flux is produced whose magnitude is constant but direction keeps changing. Difference is that transformer is an alternating flux machine while induction motor is rotating flux machine. Induction motor is a generalized transformer. It is assumed that readers are already familiar with the elementary concept of principle of operation and construction of three phase induction motor. Before any actual discussion on motor is started It will better to have a comparison of starting behavior of induction motor and transformer because as per the equivalent circuit representation a 3 phase induction motor is generalized transformer. This article will deal with those concepts of 3 phase induction motor which are essential prerequisite for proper selection, procurement, installation and maintenance of the same.