Method and device for operating an electric machine

Patent metadata

Field	Value
Publication number	US-10236809-B2
Application number	US-201715439348-A
Country	US
Kind code	B2
Filing date	Feb 22, 2017
Priority date	Aug 22, 2014
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

A method for operating an electric machine, in which a control device assigned to the electric machine is used to switch currents of winding phases of the electric machine in a pulse-modulated manner, provides that a current value of the direct input current of the control device is determined using current values of the winding phases and duty factors of the pulse modulation.

First claim

The invention claimed is:

1. A method for operating an electric machine comprising:
allocating to the electric machine a pulse modulated switching procedure of currents of winding phases of the electric machine with a control device;
ascertaining a current value of a direct current input of the control device on the basis of current values of the winding phases and duty cycles of the pulse modulation; and
determining the direct current input on the basis of a sum that is formed from products of the duty cycles of the pulse modulation of the winding phases with the corresponding currents of the winding phases.

2. The method of claim 1 , further comprising:
ascertaining a control difference signal on the basis of a predetermined maximum value of the direct current input; and
supplying the ascertained current value of the direct current input to a PI controller.

3. An electric machine comprising:
a control device which controls the electric machine by pulse modulation, wherein the control device includes instructions for:
ascertaining a current value of a direct current input;
allocating the direct current to the electric machine on the basis of current values of the winding phases and duty cycles of the pulse modulation; and
determining the direct current input on the basis of a sum that is formed from products of the duty cycles of the pulse modulation of the winding phases with the corresponding currents of the winding phases.

4. The device of claim 3 , further including instruction for:
ascertaining a control difference signal on the basis of a predetermined maximum value of the direct current input; and
supplying the ascertained current value of the direct current input to a PI controller.

5. An electric machine comprising:
a control device which controls the electric machine by pulse modulation, wherein the control device includes instructions for:
ascertaining a current value of a direct current input;
allocating the direct current to the electric machine on the basis of current values of the winding phases and duty cycles of the pulse modulation
determining the direct current input on the basis of a sum that is formed from products of the duty cycles of the pulse modulation of the winding phases with the corresponding currents of the winding phases
ascertaining a control difference signal on the basis of a predetermined maximum value of the direct current input; and
supplying the ascertained current value of the direct current input to a PI controller.

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Budianu Bogdan
• Gradinaru Vlad
• Kaufmann Tom
• Bogdan Marcu

Classifications

• H02P27/08 Primary

  with pulse width modulation · CPC title

• H02P2101/45

  for motor vehicles, e.g. car alternators · CPC title

• H02P21/22

  Current control, e.g. using a current control loop · CPC title

• H02P21/0003

  Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control · CPC title

• H02P6/28 Primary

  Arrangements for controlling current (H02P6/10 takes precedence) · CPC title