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Aug 23, 2021 · The blocked rotor test enables us to determine the efficiency and the circuit parameters of the equivalent circuit of a 3-phase induction motor. In the blocked rotor test, the shaft of the motor is locked so that it cannot rotate and the rotor winding is short circuited.
A blocked rotor test is conducted on an induction motor. It is also known as short-circuit test (because it is the mechanical analogy of a transformer short-circuit test), locked rotor test or stalled torque test.
Feb 24, 2012 · Blocked Rotor Test Definition: The blocked rotor test of an induction motor is defined as a test to find the leakage impedance and other performance parameters. Purpose of Blocked Rotor Test: It determines torque, motor characteristics, and short-circuit current at normal voltage.
Sep 22, 2020 · 3 Answers. Sorted by: 1. Fist make sure that the three-phase power voltages supplied to the motor are the proper voltage and balanced. Check the resistance U1 to V1, V1 to W1 and W1 to U1. The resistances should be very close to being equal. Do the same for U2, V2 and W2.
The locked rotor test, like short circuit test on a transformer, provides the information about leakage impedances and rotor resistance. Rotor is at the stand still, while low voltage is applied to stator windings to circulate rated current. Measure the voltage and power to the phase.
The Blocked Rotor Test of an induction motor is similar to the short circuit test of a transformer. In this test, the shaft of the motor is locked so that it cannot move and the rotor winding is short-circuited. In the slip ring motor, the rotor winding is short-circuited through the slip rings.
BLOCKED ROTOR OR SHORT-CIRCUIT TEST. Figure (a) shows the schematic diagram of blocked rotor test of an induction motor. The induction motor is locked so that it cannot move. The rotor winding is short circuited. In squirrel cage motors, the rotor bars are permanently short circuited.
