Triangle y connection to the motor's power

The stator winding y connection run by triangle instead, motor is long-term work under lower than the rated voltage of a special case. This way of running if used properly, to improve the power factor of the motor, managing electric energy has certain practical significance. A, triangular y connection to the motor's power Change the triangle to y connection, equivalent to the stator winding three phase voltage reduce to 1 /), then motor spare parts the motor of each quantity has the following changes: 1. The excitation power The field current reduced to about 1/2, so the excitation reactive power reduced to wholesalemotor.blogspot.com 1/3) (2) = 1/3.5. 2. The stator iron loss is directly proportional to the square of the voltage change, reduce to about a third. 3. The maximum torque and voltage changing proportion of square, reduce to a third. In order to maintain stable operation, the motor load will decrease accordingly. 4. Approximate slip and is inversely proportional to the square of the voltage change, under the same load, approximately increase to 3 times, but the speed changes. 5. Rotor current When the load is constant, the electromagnetic power constant; Due to the magnetic flux over voltage reduce to 1/3, square root 3 times, so the rotor current increase) increase winding fever. 6. Magnetic flux leakage reactive power Magnetic flux leakage voltage and reactive power to quadratic inverse proportion increase more, about three times as much. 7. The stator current of the stator current is determined by the rotor current and no-load current y connection, the former, the www.facebook.com/guohong.trading latter is reduced, so the stator current may increase or decrease, depends on the magnetic properties of the motor and load size. Fall, but in general, voltage, stator current increase. Active loss of 8. Due to the current in the rotor winding loss increase) and increased to 3 times, 3 times in the stator winding loss or increase or decrease, motor lamination depends on the change of the stator current. Comprehensive above, change the triangle to y connection, due to the reduced voltage, maximum torque decreases, and rotor current increase. If you maintain the load constant, is bound to cause the winding severe fever; Or because the torque is too small and make the motor stalling. In order to make the rotor after y connection instead Electric current shall not exceed the rating, should appropriate reduce the load of the motor.