Control apparatus for induction machine

Claim 2

A control apparatus for an induction machine including magnetization current calculating means for calculating a magnetization current command in accordance with a secondary flux command, torque current calculating means for calculating a torque current command in accordance with a torque command, slip frequency calculating means for calculating a slip frequency command in accordance with the secondary flux command and the torque command, means for generating a primary current command in accordance with the amplitude corresponding to that of the vector sum of the magnetization current command and the torque current command and in accordance with the phase corresponding to that of the slip frequency command and means for controlling the primary current of the induction machine in accordance with the primary current command, said control apparatus for the induction machine characterized by: first correction means (11, 15) for correcting said magnetization current command while making null the deviation of an actual flux from the secondary flux command relative to the direct axis of a rotary coordinate system which is constructed of the direct axis in the flux direction and the quadrature axis orthogonal to said direct axis; and second correction means (16, 19) for correcting said slip frequency command while making the flux relative to the quadrature axis null.

Claim 3

A control apparatus for an induction apparatus according to claim 1, wherein said magnetization command is supplied feed-forwardly by calculating the direct axis magnetization current to be estimated from said secondary flux command and the induction machine constants, and said slip frequency command to be estimated from said secondary flux command, torque command and induction machine constants, to thereby perform vector control of said induction machine using both the direct axis flux control and slip frequency control.

Claim 4

A control apparatus for an induction machine including magnetization current calculating means for calculating a magnetization current command in accordance with a secondary flux command, torque current calculating means for calculating a torque current command in accordance with a torque command, slip frequency calculating means for calculating a slip frequency command in accordance with the secondary flux command and the torque command, means for generating a primary current command in accordance with the amplitude corresponding to that of the vector sum of the magnetization current command and the torque current command and in accordance with the phase corresponding to that of the slip frequency command and means for controlling the primary current of the induction machine in accordeance with the primary current command, said control apparatus for the induction machine characterized by: first correction means (11, 15) for correcting said magnetization current command while making null the deviation of an actual flux from the secondary flux command relative to the direct axis of a rotary coordinate system which is constructed of the direct axis in the flux direction and the quadrature axis orthogonal to said direct axis; and second correction means (16, 19) for correcting said slip frequency command while making null the deviation of an actual torque current from said torque current command.

Claim 5

A control apparatus for an induction machine including magnetization current calculating means for calculating a magnetization current command in accordance with a secondary flux command, torque current calculating means for calculating a torque current command in accordance with a torque command, slip frequency calculating means for calculating a slip frequency command in accordance with the secondary flux command and the torque command, means for generating a primary current command in accordance with the amplitude corresponding to that of the vector sum of the magnetization current command and the torque current command and in accordance with the phase corresponding to that of the slip frequency command and means for controlling the primary current of the induction machine in accordeance with the primary current command, said control apparatus for the induction machine characterized by: first correction means (11, 15) for correcting said magnetization current command while making null the deviation of an actual flux from the secondary flux command relative to the direct axis of a rotary coordinate system which is constructed of the direct axis in the flux direction and the quadrature axis orthogonal to said direct axis; and second correction means (16, 19) for correcting said slip frequency command while making null the deviation of an actual torque current from said torque current command.

Claim 6

A control apparatus for an induction apparatus according to claim 3, wherein said magnetization command is supplied feed-forwardly by calculating the direct axis magnetization current to be estimated from said secondary flux command and the induction machine constants, and said slip frequency command to be estimated from said secondary flux command, torque command and induction machine constants, to thereby perform vector control of said induction machine using both the direct axis flux control and slip frequency control.