Jan 13, 2015  5. A wound-rotor induction motor is used when a strong starting torque and a range of speed control are required. Typical applications include cranes, large compressors, elevators, and pumps. Compared to the squirrel-cage induction motor, the. Key Differences Between Slip Ring & Squirrel Cage Induction Motor. The motor whose rotor is wound type such type of motor is called slip ring induction motor, whereas the squirrel cage motor, has a squirrel cage type rotor. The rotor of the slip ring motor has a cylindrical core with parallel slots, and each slot consists each bar.

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Both have 3 a phase stator winding, the squirrel cage has a rotor with bars arranged around it's periphery, these bars are joined at both ends by a continuous ring. This forms a closed circuit of low resistance which is fixed. The wound rotor (slip ring motor) is similar in construction but the bars are replaced by copper windings, similar to those in the stator. They are star connected and the three ends are brought out to slip rings which allow an electrical connection to be made to the outside world. O quarto poder dublado 1986. When no connection is made between these ends and the stator is energised, little current flows in the stator which does not turn, but when some resistance is inserted, current flows in the stator windings and the rotor rotates. As the rotor gains speed the resistance is taken out of circuit and the slip rings shorted together. The motor runs as a cage induction motor.

There is no 'slam dunk' answer for calculating the derating of a motor operated beyond its manufacturer's rated temperature. There is a very good reason for this. The 'curve' of a motor's performance with regard to temperature isn't linear. In fact, it's far from it. And it will vary a great deal de pending on a number of characteristics associated with a given machine. These will include its rating at 'ambient' temperature, its size, and number of other things about its shape and mechanical construction.

If an individual needs to operate a motor outside the manufacturer's ratings, it's a no-brainer that the manufacturer should be contacted to get information. The hook is economy.

A lot of motors can be 'pushed' a bit over their operating temperatures for a short time, but extended operation in the 'red zone' will bring early failure. 'Over-rating' a motor isn't a good idea if the objective is to save a few bucks. It will cost more in the long run to 'cook' the unit and have to replace it than to get one that is rated for the operating conditions or to run cooling to the motor. This is really a question of engineering, and the smart engineer will cool a given motor or will get a different motor that is rated for the operating conditions. Synchronous and induction machines both produce torque through theinteraction of a rotor magnetic field and a stator magnetic field.The differences between the two types of machines arise because ofthe differences in the way the rotor magnetic field is generated.