Starting of 3 phase induction motors, high starting torque motors. We thank you for making this choice, and would ask you to read the contents of this manual. One single phase wattmeter plus miscellaneous apparatus as needed. These are of two types, squirrel cage and slip ring motors. Example for this example, refer to the motor equivalent circuit and calculations described above. Installation and maintenance threephase induction motors. They have a good efficiency for a low cost and are very robust. A 12pole, 3phase alternator driven at a speed of 500 r. A 3 phase, y connected, 460 volt line to line, 25 horsepower, 60 hz, 8 pole induction motor has the following constants, in ohms per phase referred to the stator.
Three phase induction motors master line 3 mounting characteristics powers up to 50,000 kw voltages from 220 to,800 v speed from 3,600 to 300 rpm manufactured in different configurations of cooling methods and degrees of protection, adapting to the operating and environmental conditions. Squirrel cage and wound rotor or slip rig induction motor. Output power shown by means of this resistance is zero. Record all nameplate information for the induction motor. In this case, power flows from the mechanical system, to the rotor circuit, then across the air gap to the stator circuit and external electrical system. These motors are selfstarting and use no capacitor, start winding, centrifugal switch or other starting device.
A three phase im, six poles, 50 hz is supplied by a three. An electrical motor is an electromechanical device which converts electrical energy into mechanical energy. Find the starting current of 10 hp, three phase 220 v a class motor. Ac induction motors are also the most common motors used in main. The basic idea of an electric motor is to generate two magnetic fields. A 480v, 60 hz, 6pole, threephase, deltaconnected induction motor has the.
Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. A 3 phase induction motor can be used for different applications with various speed and load requirements. These types of motors are known as selfstarting induction motors. You should also make a dc measurement of stator winding linetoline resistance. There are mainly two types of induction motor on the basis of power supply, single phase induction motor and three phase induction motor. Cage induction machines institut fur elektrische energiewandlung. In the case of three phase ac alternating current operation, the most widely used motor is a 3 phase induction motor, as this type of motor does not require an additional starting device.
The threephase induction motor is the extensively used for various kinds of industrial drives. Three phase ac induction motors are widely used in industrial and commercial applications. One singlephase wattmeter plus miscellaneous apparatus as needed. Induction motor basics, single phase and three phase. Based on the rotor construction, 3 phase induction motor can be of two types. Ac introduction motors have been used in traction applications for a long time.
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