Sew-eurodrive Gmbh & Co Kg

Sew-eurodrive Gmbh & Co

Wolfgang Hammel

Matthias Hauck

Harald Wolf

Ulrich Neumayer

Thomas Schuster

Thomas Uhl

Marek Lewandowski

Thomas Knapp

Hans Juergen Kollar

Ralph Meyer

In a method for determining the rotor position of a three-phase machine without using a rotary encoder, and to a device for controlling a three-phase motor without using a rotary encoder, the three-phase machine is fed by a converter that can be operated by pulse-width modulation, and the converter has model variables for the rotor angle and the current indicator of the three-phase machine, and the converter has device(s) by using which, in control operation, at least two values are measured which represent a measure of the local inductances of the machine which represent a measure of the local inductances of the machine, the error of the model rotor angle is determined in that, depending on the model rotor angle and the model current indicator, at least two weighting factors are determined, and in that a weighted sum is formed from the at least two measured values and the at least two weighting factors, and in that a further offset value is substracted from the sum, which is likewise determined on the basis of the model rotor angle and the model current indicator.

Method for determining a rotor position of a three-phase machine without using a rotary encoder and device for controlling a three-phase motor without using a rotary encoder

In a method for determining the rotor position of a three-phase machine without using a rotary encoder, and a device for controlling a three-phase motor without using a rotary encoder, the three-phase machine is fed by a converter that can be operated by pulse-width modulation, and the converter has model variables for the rotor angle and the current indicator of the three-phase machine, and the converter has device(s) by using which, in control operation, at least two values are measured which represent a measure of the local inductances of the machine which represent a measure of the local inductances of the machine, the error of the model rotor angle is determined in that, depending on the model rotor angle and the model current indicator, at least two weighting factors are determined, and in that a weighted sum is formed from the at least two measured values and the at least two weighting factors, and in that a further offset value is subtracted from the sum, which is likewise determined on the basis of the model rotor angle and the model current indicator.

In method for processing a measured-value signal determined in an analog manner and a resolver system for implementing the method, the measured-value signal being supplied to a delta-sigma modulator, which makes a bit stream, particularly a one-bit data stream, available on the output side, in particular, whose moving average corresponds to the measured-value signal, the bit stream being supplied to a first digital filter, which converts the bit stream into a stream of digital intermediate words, that is a multibit data stream, the first digital filter having three serially arranged differentiators, the bit stream being clocked at a clock frequency f, that is, at a clock-pulse period T=1/f, and therefore the stream of digital intermediate words being clocked, and thus updated, at a clock-pulse frequency f, that is, at a clock-pulse period T=1/f, the output signal of the first digital filter being supplied to a second digital filter, the second digital filter having as its output data-word stream the difference between a first and a second result data-word stream, the first and second result data-word stream being determined around a first and second time interval from the intermediate data-word stream, the first and second time interval being situated at a distance in time T, the first result data-word stream being determined as a time-discrete second derivation with time scale TD and the second result data-word stream being determined as a time-discrete second derivation with time scale TD.

Method for processing a measured-value signal determined in an analog manner, a resolver system for implementing the method and a method for determining an output current of a converter

A method for processing a measured-value signal representing a value, determined in analog form, for the output current of a converter, and device for carrying out the method, the measured-value signals acquired by a sensor, especially including a shunt resistor, being supplied to a respective processing channel that has at least one delta-sigma modulator.

Method for processing a measured-value signal representing a value determined in analog form for the output current of a converter and device for carrying out the method

A method for determining the rotor position of a synchronous machine operated in field-oriented manner, which has an effective inductivity that is dependent on the rotor position,

Method for determining the rotor position of a synchronous machine operated in field-oriented manner

A drive, including an electric motor, which is supplied by a rectifier, the rectifier including a time-discrete closed-loop control structure, which regulates the stator current of the electric motor by setting the voltage applied at the motor, the current of the motor being acquired in time-discrete fashion, the closed-loop control structure including a first closed-loop controller whose setpoint is the output value of a first non-linear transfer member, and whose actual value is the output value of a second non-linear transfer member, the input value of the first non-linear transfer member being the setpoint of a first current component of the current, the input value of the second non-linear transfer member being the actual value of a first current component of the current.

Drive and method

Method for processing a measured-value signal representing a value determined in analog form for the output current of a converter and device for carrying the method

In method for processing a measured-value signal determined in an analog manner and a resolver system for implementing the method, the measured-value signal being supplied to a delta-sigma modulator, which makes a bit stream, particularly a one-bit data stream, available on the output side, in particular, whose moving average corresponds to the measured-value signal, the bit stream being supplied to a first digital filter, which converts the bit stream into a stream of digital intermediate words, that is a multibit data stream, the first digital filter having three serially arranged differentiators, the bit stream being clocked at a clock frequency f, that is, at a clock-pulse period T=1/f, and therefore the stream of digital intermediate words being clocked, and thus updated, at a clock-pulse frequency f, that is, at a clock-pulse period T=1/f, the output signal of the first digital filter being supplied to a second digital filter, the second digital filter having as its output data-word stream the difference between a first and a second result data-word stream, the first and second result data-word stream being determined around a first and second time interval from the intermediate data-word stream, the first and second time interval being situated at a distance in time T1, the first result data-word stream being determined as a time-discrete second derivation with time scale TD and the second result data-word stream being determined as a time-discrete second derivation with time scale TD.

An open-loop or closed-loop control method for a converter which supplies an electric motor, wherein a current space vector is acquired as motor current, and the motor voltage, in particular a voltage space vector, is set, an induced voltage space vectoris determined, which is forwarded to an integration element, a flux space vector being generated, whose angular position is perpendicular to the voltage space vector, the amount of the flux space vector corresponding to a predefined nominal value, the difference of the integration result and the flux space vector thus produced being used as feedback in the integration element.

Open-loop or closed-loop control method for a converter

A drive and a method, including an electric motor, which is supplied by a rectifier, the rectifier including a time-discrete closed-loop control structure, which regulates the stator current of the electric motor by setting the voltage applied at the motor, the current of the motor being acquired in time-discrete fashion, the closed-loop control structure including a closed-loop controller whose actual value is a first current component of the current, the setpoint input of the closed-loop controller being coupled with at least one upstream setpoint limiter.

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Bruchsal, Germany

Wolfgang Hammel