| 摘要 |
A testing apparatus for rotors of electric motors comprising a test fixture including a fixture shaft on which a rotor is temporarily attached to a known inertial load. A stator (20) creates rotating magnetic field to cause rotation of the rotor (70), and an encoder senses the amount of angular rotation of the rotor in short time intervals, which is recorded in a memory and later used to calculate torque. An index mark from the encoder indicates each complete revolution of the rotor and may be used to determine the location of a defective rotor segment by reference to start point mark placed on the rotor prior to the test. An electronic control circuit (100) initially applies a low value electric current to the stator to create a rotating magnetic field to cause the rotor to rotate at a slower than normal rate to improve the resolution of the torque measurement. After the rotor has accelerated to a predetermined value, the stator voltage may be increased. The amount of actual rotation of the rotor at multiple, known time intervals as the rotor accelerates to a predetermined speed is used to calculate actual voltage. |
