Patent ID: 8129936

Claim:
An open-loop or closed-loop control device for the operation of an asynchronous machine which is powered by a 3-phase power converter, comprising an open-loop and/or closed-loop control structure, the control structure comprising: a slip frequency controller with an output at which the slip frequency controller outputs a reference value of a stator frequency of the asynchronous machine, a stator flux controller and a first pulse pattern generator for the generation of pulse signals based on mean values, wherein the control structure can be used such that the first pulse pattern generator generates the pulse signals based on mean values so that switching operations of the 3-phase power converter occur in synchronization with the fundamental frequency of rotation of the stator flux space vector, the control structure can be used such that the first pulse pattern generator generates pulse signals based on mean values so that switching operations of the 3-phase power converter are asynchronous with the fundamental frequency of rotation of the stator flux space vector, one output of the stator flux controller is in communication with an input of the pulse pattern generator so that the pulse pattern generator can generate the pulse signals as a function of a manipulated variable which is generated by the stator flux controller, the stator flux controller is adapted to generate the manipulated variable as a function of a reference value of the stator flux of the asynchronous machine and as a function of a reference value of the torque of the asynchronous machine, and the stator flux controller has a dead-beat control response and the output of the slip frequency controller is in communication with an input of the stator flux controller so that the reference value of the stator frequency is used for the generation of the manipulated variable, and a second pulse pattern generator in communication with an output of a stator flux observer, such that during the operation of the asynchronous machine by means of stator flux trajectory guided synchronous pulse patterns based on instantaneous values, the pulse pattern is generated directly as a function of a reference value of the stator flux and the current value, the current value being determined by the stator flux observer, wherein the second pulse pattern generator is switched in parallel to the first pulse pattern generator, and wherein the output of the slip frequency controller is also in communication with an input of the second pulse pattern generator, such that the same slip frequency controller is used regardless of whether the device for the operation of the asynchronous machine generates the pulse pattern based on mean values.