| 摘要 |
A drive circuit for interfacing an electrical machine having a stator to an AC network, the circuit comprising: first and second network rectifier/inverters connectable to the AC network in parallel; a first PWM rectifier/inverter connected to the first network rectifier/inverter through a first DC link; a second PWM rectifier/inverter connected to the second network rectifier/inverter though a second DC link; a first two-layer stator winding having a plurality of stator coils connected to the first PWM rectifier/inverter; and a second two-layer stator winding having a plurality of stator coils connected to the second PWM rectifier/inverter. The stator coils of the first stator winding and the stator coils of the second stator winding are interconnected such that, in use, the vector sum of voltages across the stator coils in the first stator winding is substantially equal to the vector sum of voltages across the stator coils in the second stator winding. This reduces the PWM frequency current harmonics flowing in the first and second stator windings.
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