Lenze Drives Gmbh

Lenze Se (societas Europaea)

Lenze Se

Torben Jonsky

Heiko Stichweh

Volker Grabs

Jan Wettlaufer

Holger Borcherding

Martin Ehlich

Johannes Kuehn

Thorsten Hohnsbein

Abdenbi Maghnaoui

Felix Klute

A method for determining a rotational angle position of a rotor of a multiphase electrical machine, includes the steps of: generating phase voltages for the multiphase electrical machine by pulse width modulation in accordance with a drive voltage vector circulating in a stator-fixed coordinate system. During a determination time interval: a) generating a test voltage vector, vectorially adding the test voltage vector and the actual drive voltage vector to form a sum vector, outputting the sum vector, and measuring a resulting change of a current vector formed from phase currents; b) repeating step a) for a changed rotational angle position and/or a changed value of the drive voltage vector and for a changed test voltage vector a number n of times so that a total of n+I different test voltage vectors and sum vectors are generated and n+I resulting changes of the current vector are measured; and c) estimating the rotational angle position of the rotor in accordance with the total of n+I measured changes of the current vector.

Method for determining a rotational angle position of a rotor of a multiphase electrical machine, and frequency converter

A method for adjusting a parameter value of a position controller and a parameter value of a rotational speed controller is provided. The position controller and the rotational speed controller are cascaded and are a component of a control circuit. The method includes generating and displaying a two-dimensional parameter adjusting field, wherein points in the two-dimensional parameter adjusting field are selectable by a user, and a specific parameter value of the position controller and a specific parameter value of the rotational speed controller are allocated to a point, and after the user has selected a point adopting the specific parameter value of the position controller that is allocated to the selected point and adopting the specific parameter value of the rotational speed controller that is allocated to the selected point.

Method for adjusting a parameter value of a position controller and for adjusting a parameter value of a rotational speed controller, and an electric drive system

A method ascertains current-dependent inductances of a polyphase electrical machine. The method generates phase voltages for the polyphase electrical machine by means of a pulse width modulation such that currents of predefined current level flow through stator windings of the electrical machine. During a number of cycles of the pulse width modulation, the method generates a voltage pulse such that a change of current is brought about in a torque-forming axis of the polyphase electrical machine and/or in a field-forming axis of the polyphase electrical machine. The method measures the change of current, and ascertains the current-dependent inductances on the basis of the change of current.

Method for determining current-dependent inductances of a multi-phase electrical machine and frequency converter

A motor system includes: a stator; a rotor; a motor shaft, which is mechanically coupled for conjoint rotation with the rotor, and which defines a radial direction and an axial direction of the motor system; heat-generating components, in particular power semiconductors; a control device which is designed to control an operation of the motor system; and a housing. The housing has a first central chamber, wherein the stator, the rotor and the heat-generating components are arranged inside the first chamber, and wherein the heat-generating components are connected to an outer wall of the first chamber, and has a number of second chambers, wherein the second chambers radially surround the first chamber, and wherein the second chambers form closed channels for guiding cooling air.

Motor system

A drive system has an electric motor, wherein the electric motor includes a first three-phase stator winding system and a second three-phase stator winding system. The first and the second stator winding system are arranged on the stator in a manner rotated through an electrical phase angle in relation to one another. The drive system includes a frequency converter, wherein the frequency converter has a first bridge circuit arrangement which is designed to generate voltages for the first winding system and a second bridge circuit arrangement which is designed to generate voltages for the second winding system. The first bridge circuit arrangement and the second bridge circuit arrangement are connected in series. A control device is designed to actuate the first bridge circuit arrangement and the second bridge circuit arrangement.

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Hannover, Germany

Torben Jonsky