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Aug 2, 2016 · Thus we see that Induction Motor is self-starting. It does not require nay external mean to rotate. Now we consider a 3-phase synchronous motor. A 3-phase supply is given to the armature of Synchronous Motor, produces a rotating magnetic field.
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Aug 26, 2022 · The starting method of three phase induction motor that uses an auto-transformer to reduce the starting current of the motor is called autotransformer starting. The autotransformer starter can be equally used for starting both delta-connected and star-connected three-phase induction motors. The circuit diagram of the autotransformer starter is ...
At s = 1, N = 0 i.e. start, motor produces a torque called starting torque denoted as T st. The entire torque – slip characteristics is shown in the Fig. 1. Fig. 1 Torque speed characteristics
The starting methods of three phase induction motor generally are direct-on-line starting, reduced-voltage starting and soft starter. This kind of starting mode is the most basic and simplest in the motor starting. The method is characterized by less investment, simple equipment and small quantity. Although the starting time is short, the ...
The circuit diagram of soft-starting of three phase IM is shown in Fig.1. The circuit diagram comprises of voltage regulator, zero crossing detector, bridge rectifier, 4N25 opt-Isolator, Atmega 328P microcontroller and TRIAC circuit. TRIAC circuit performs the role of soft starter in each phase of three phase induction motor.
Just like any other motor, a 3 phase induction motor also consists of a stator and a rotor. Basically there are two types of 3 phase IM - 1. Squirrel cage induction motor and 2. Phase Wound induction motor (slip-ring induction motor). Both types have similar constructed rotor, but they differ in construction of rotor.
