| 摘要 |
PCT No. PCT/GB81/00199 Sec. 371 Date Apr. 30, 1982 Sec. 102(e) Date Apr. 30, 1982 PCT Filed Sep. 23, 1981 PCT Pub. No. WO82/01283 PCT Pub. Date Apr. 15, 1982.An arrangement to provide variation of the speed or other operating parameters of an electrical machine without connection to the rotor. The machine is of the induction type having a winding in separate parts to create a flux movable in the air-gap different speeds by the alteration of current in a part of the winding. In one example the current is altered by a variable impedance connected to one winding part, the other part being connected to an electrical supply. Another example, FIG. 6, shows two machines (NM1, NM2) arranged to drive a rail vehicle through smooth rail wheels attached to the machine rotor axles. A single, variable-frequency, inverter (NI) drives both machines and is connected to part (MP) of each machine winding. Other parts (AP) of each machine winding are connected together by a link (NC). In operation power (real or reactive) is transferred between the machines along the link to equalize the torque of the machines. Run-away of one machine while the other stalls is thereby avoided.
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