초록 ▼

A twelve-pulse control current inverter system having two six-pulse powered channels connected to a source of variable dc current is selectively operable to control either a three-phase motor or a double three-phase motor. Signals representing the phase currents of each of the two channels are combi

A twelve-pulse control current inverter system having two six-pulse powered channels connected to a source of variable dc current is selectively operable to control either a three-phase motor or a double three-phase motor. Signals representing the phase currents of each of the two channels are combined with direct and quadrature motor flux signals, the latter signals being shifted in phase in the case of the double three-phase motor, to produce torque signals representing the motor torque produced by each of the two powered channels. These two torque signals are then combined to provide a total torque signal which, in turn, is utilized in the development of an angle signal for the control of the two current inverters.

대표청구항 ▼

An ac motor drive for use with an ac motor having a stator and a rotor spaced from said stator by a gap across which gap flux is produced in response to electrical currents supplied to said motor comprising; (a) a source of variable dc current; (b) first and second sources of variable frequency poly

An ac motor drive for use with an ac motor having a stator and a rotor spaced from said stator by a gap across which gap flux is produced in response to electrical currents supplied to said motor comprising; (a) a source of variable dc current; (b) first and second sources of variable frequency polyphase ac current connected to said source of dc current for furnishing a motor current to the motor; (c) means to develop direct and quadrature flux signals proportional to direct and quadrature components of motor gap flux; (d) means to develop phase current signals representing, respectively, the current in each phase of the current furnished to the motor; (e) means responsive to said phase current signals and said flux signals to develop first and second torque signals representing the torque developed by the motor from each of said sources of ac current; (f) means to sum said first and second torque signals to provide a total torque signal; (g) means responsive to said total torque signal to develop a single angle signal representative of the instantaneous angle between the gap flux and motor current; and, (h) means responsive to said angle signal to generate a frequency error signal operative to control the frequency of operation of said first and second sources of variable frequency, polyphase electrical power.