CPPM Mahine: A Synchronous Permanent Magnet Machine with Field Weakening
نویسندگان
چکیده
Due to its particular configuration, the Consequent Pole Permanent Magnet (CPPM) machine allows one to easily control the airgap flux in a wide range so that the power capability of the machine is increased over a wide speed range. Two components of the flux, one almost constantcoming from the permanent magnet located on the rotor surface of the machine, and the other –variablecoming from a field winding located in the middle of the stator, converge in the airgap characterizing the level of excitation of the machine. The field winding -when a variable DC current is injectedprovides an adaptable level of excitation in both positive and negative directions respect to the PM magnetization. In this manner, control of the airgap flux can be obtained with a reduced amount of field MMF. A prototype using this configuration has been built and experimental results show that with 10% of the phase MMF it is possible to vary the flux in a range over +/-40%.
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