US 10,707,793 B2Granted

Method and apparatus for operating a synchronous machine having a permanent-magnet rotor

AssigneeDr. Ing. h.c. F. Porsche Aktiengesellschaft

InventorsJan Nägelkrämer, Axel Heitmann, Thomas Hubert, Sven Luthardt, Stefan Schmitz

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method for operating a synchronous machine having a rotor, comprising the following features: the synchronous machine is modelled, with respect to the rotor, as a two-phase system with a direct-axis current and a quadrature-axis current, rotor losses of the synchronous machine, which rotor losses occur in the rotor, are numerically described by an evaluation function of the first direct-axis current, of the quadrature-axis current and of a specified rotation speed of the synchronous machine, and, on the basis of the evaluation function, the direct-axis current and the second quadrature-axis current are controlled for the specified rotation speed and a required torque in such a way that the synchronous machine outputs the required torque and the rotor losses are low and a corresponding synchronous machine, a corresponding computer program and a corresponding storage medium.

Claims1

Dependent claims

A motor controller for operating an electric motor of an electric vehicle, the motor controller comprising:

a machine-readable storage medium including a computer program;
a processor;
wherein execution of the computer program by the processor causes the motor controller to:
model a rotor and a stator of the electric motor as a two-phase system with varying direct-axis currents and varying quadrature-axis currents;
for a specified rotation speed of the rotor, determine an optimum combination of a direct-axis current and a quadrature axis-current by executing a numerical simulation, wherein the numeral simulation includes a two-dimensional or a three-dimensional final element method (FEM) that:
receives as input:
(i) the varying direct-axis currents, and (ii) the varying quadrature-axis currents, and
calculates and outputs the optimum combination of the direct-axis current and the quadrature axis-current based on derating during operation of the electric motor to:
(i) obtain a minimal set of iron and magnetic losses in the rotor of the electric motor at the specified rotation speed of the electric motor, and (ii) further obtain a minimal set of copper and iron losses in the stator at the specified rotation speed of the electric motor;
and
control, the specified rotation speed of the rotor on the basis of the optimum combination of the direct-axis current and the quadrature axis-current for the specified rotation speed to:
(i) obtain the minimal set of iron and magnetic losses in the rotor of the electric motor, and (ii) the minimal set of copper and iron losses in the stator.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/979,763Filed 15 May 2018
Priority: DE 10 2017 112 3886 Jun 2017
Published: US 2019/0356254 A121 Nov 2019
Granted: 7 Jul 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H02P 21/0017
Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control: model reference adaptation, e.g. MRAS or MRAC, useful for…
H02P 21/50
Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation: vector control arrangements…
G06F 30/23
Design optimisation, verification or simulation: using finite element methods [FEM] or finite difference methods [FDM]
H02P 6/34
Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position;…:…