| 摘要 |
A method for reducing cogging torque effects of an electrical permanent magnet machine (1) where the machine (1) is connected to a drive (8), and where the drive (8) includes a feature of adding a torque component independent of a torque generated by a speed regulator, the machine having a rotor and a stator, where the method includes: - measuring the angular position of the rotor relative to the stator and the angular speed of the rotor by use of a sensor (6); - running at least two tests with at least two different cogging compensation signals from the drive (8) where one of the tests are designated an "a" test and another test is designated a "b" test; - analyse the received signal from the sensor (1) or sensors to find the corresponding amplitude and phase responses of the vibration signal for said tests; - calculate a first value by multiplying the complex cogging amplitude of the applied compensation signal for the a test with the complex amplitude of the vibration signal representing vibrations resulting from the cogging torque of the b test; - calculate a second value by multiplying the complex cogging amplitude of the applied compensation signal for the b test with the complex amplitude of the vibration signal representing vibrations resulting from the cogging torque of the a test; - calculate the desired complex cogging compensation amplitude by dividing the difference between said first value and said second value by the difference between the complex amplitudes of the vibration signals representing vibrations resulting from the b test and the a test; -apply a cogging compensation torque to the machine (1) based on the desired complex cogging compensation amplitude.
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