Why would a brake rotor be blocked?

A blocked rotor test is normally performed on an induction motor to find out the leakage impedance. Blocked rotor test is analogous to the short circuit test of transformer. Here shaft of the motor is clamped i.e. blocked so it cannot move and rotor winding is short circuited.

What are the reasons in conducting no load test with rated voltage and blocked rotor test with rated current?

1. To obtain the variation of no load power and current and blocked rotor power and current with changes in the applied voltage to the stator. 2. To determine the equivalent circuit parameters of an induction motor.

How can the blocked rotor test be performed to obtain induction motor characteristics near synchronous speed?

As in Transformer short circuit test, we apply a voltage which can circulate rated current in the winding, likewise in Blocked Rotor Test we apply a Voltage to the Stator winding of an Induction Motor by using VARIAC so that rated current flows through the stator winding.

What is no load and blocked rotor test?

Thus no load and blocked rotor tests are performed on the motors. As the name suggest no load test is performed when rotor rotates with synchronous speed and there is no load torque. This test is similar to the open circuit test on transformer. Actually, to achieve synchronous speed in an induction motor is impossible.

What is brake rotor?

Rotors: Disc brakes, or brake rotors, are usually on the front two wheels of a car. Brake rotors are what your vehicle’s brake pads clamp down on to stop the wheels from spinning. Brake Pads: The brake pads are what contact and apply pressure and friction to a car’s rotors.

What is the no-load and blocked rotor test on three phase motor?

Experiment no. 3 No-Load and Blocked Rotor Test on Three Phase Induction Motor Aim of the Experiment: 1. To obtain the variation of no load power and current and blocked rotor power and current with changes in the applied voltage to the stator. 2. To determine the equivalent circuit parameters of an induction motor.

What is the purpose of blocked rotor test?

Similarly, the blocked rotor test is performed to know the behavior of an induction motor when it is fully-loaded i.e., as same as the short-circuit test. The purpose of this is to determine the total resistance (R 01) and reactance (X 01) of the motor as referred to the stator.

What is the slip when the rotor is blocked?

When the rotor is blocked, slip s = 1 and the approximate equivalent circuit referred to the stator is shown below. I sc = Per phase values of applied current under blocked rotor conditions. The curves from the blocked rotor test by varying the voltage is shown below.

Why is the rotor of a stator blocked?

The rotor is blocked to prevent rotation and balanced voltages are applied to the stator terminals at a frequency of 25 percent of the rated frequency at a voltage where the rated current is achieved.