Method for determining a rotor frequency and/or a rotor angle of a rotor of a reluctance machine, control device, and drive assembly

Patent metadata

Field	Value
Publication number	US-9935574-B2
Application number	US-201515523178-A
Country	US
Kind code	B2
Filing date	Oct 23, 2015
Priority date	Oct 31, 2014
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A method for determining a rotor frequency and/or a rotor angle of a rotor of a reluctance machine, in particular without an amortisseur, is disclosed. The reluctance machine has a stator with a stator winding and the rotor has a magnetically anisotropic rotor core. The method includes applying a temporal sequence of voltage pulses to the stator winding, determining a sequential pulse response of a current flowing in the stator winding, the current being generated as a result of the voltage pulses and a flux being generated from the voltage pulses as a result of the magnetically anisotropic rotor core, and determining the rotor frequency and/or the rotor angle based on the measured sequential pulse response of the electric current by using an evaluating device.

First claim

The invention claimed is:

1. A method, comprising:
applying a temporal sequence of voltage pulses to a stator winding of a stator of a reluctance machine via a frequency converter by alternately outputting a voltage value of a fixed amount and a fixed direction and a pulse block in a sequential repetition; and
determining a rotor frequency and/or a rotor angle of a rotor of the reluctance machine by measuring a sequential pulse response of an electric current by using an evaluating device, said electric current having a negative-phase component representing a part of the electric current changing as a function of the rotor angle and a positive-phase component representing a part of the electric current not undergoing a change as a function of the rotor angle, wherein the sequential pulse response of the electric current, which flows in the stator winding is generated as a result of the voltage pulses, and a flux is thereby sequentially generated from the voltage pulses as a result of the rotor having a magnetically anisotropic rotor core.

2. The method of claim 1 , wherein the rotor frequency and/or the rotor angle is determined based on a geometry of the rotor core.

3. The method of claim 1 , further comprising preparing a phase and/or a frequency of a temporal course of the electric current using a phase control loop of a control device.

4. The method of claim 3 , wherein the control device has at least one meter and/or one detector used for determining maximum values for the measured electric current and/or a time interval between at least two adjacent maxima of the temporal course of the electric current.

5. The method of claim 1 , wherein the rotor frequency and/or the rotor angle is determined when the rotor is stationary or when the rotor is rotating relative to the stator.

6. The method of claim 1 , wherein a converter is connected to the reluctance machine based on the determined rotor frequency and/or the rotor angle.

7. A control device for a converter of a reluctance machine, comprising:
at least one meter and/or one detector for determining a rotor frequency and/or a rotor angle of a rotor of the reluctance machine, said at least one meter and/or one detector determining maximum values for a measured electric current and/or a time interval between at least two adjacent maxima of a temporal course of the electric current, said control device, by operating the at least one meter and/or the one detector is configured to:
apply a temporal sequence of voltage pulses to a stator winding of a stator of the reluctance machine via a frequency converter by alternately outputting a voltage value of a fixed amount and a fixed direction and a pulse block in a sequential repetition; and
determine the rotor frequency and/or the rotor angle of the rotor of the reluctance machine by measuring a sequential pulse response of the electric current via an evaluating device, said electric current having a negative-phase component representing a part of the electric current changing as a function of the rotor angle and a positive-phase component representing a part of the electric current not undergoing a change as a function of the rotor angle, wherein the sequential pulse response of the electric current, which flows in the stator winding is generated as a result of the voltage pulses, and a flux is thereby sequentially generated from the voltage pulses as a result of the rotor having a magnetically anisotropic rotor core.

8. A drive assembly, comprising:
a reluctance machine;
a converter electrically connected to the reluctance machine; and
a control device for controlling the converter, said control device including at least one meter and/or one detector for determining a rotor frequency and/or a rotor angle of a rotor of the reluctance machine, said at least one meter and/or one detector determining maximum values for a measured electric current and/or a time interval between at least two adjacent maxima of a temporal course of the electric current, said control device, by operating the at least one meter and/or the one detector is configured to:
apply a temporal sequence of voltage pulses to a stator winding of a stator of the reluctance machine via a frequency converter by alternately outputting a voltage value of a fixed amount and a fixed direction and a pulse block in a sequential repetition; and
determine the rotor frequency and/or the rotor angle of the rotor of the reluctance machine by measuring a sequential pulse response of the electric current via an evaluating device, said electric current having a negative-phase component representing a part of the electric current changing as a function of the rotor angle and a positive-phase component representing a part of the electric current not undergoing a change as a function of the rotor angle, wherein the sequential pulse response of the electric current, which flows in the stator winding is generated as a result of the voltage pulses, and a flux is thereby sequentially generated from the voltage pulses as a result of the rotor having a magnetically anisotropic rotor core.

Assignees

• Siemens Ag

Inventors

• Sinner Harald
• Weigel Thilo

Classifications

• H02P6/185

  using inductance sensing, e.g. pulse excitation · CPC title

• G01P3/44

  for measuring angular speed (G01P3/56 takes precedence) · CPC title

• H02P6/183

  using an injected high frequency signal · CPC title

• H02P21/18 Primary

  Estimation of position or speed · CPC title

• H02P21/24

  Vector control not involving the use of rotor position or rotor speed sensors · CPC title