Method and device for controlling a brushless direct-current motor
AssigneeSiemens VDO Automotive Corporation
InventorsMathias Fernengel, Reiner Grossmann, Frank Sader
Life of this patent
Estimating the term…
Abstract
Presented in an apparatus for controlling a brushless DC motor with a permanent magnet arranged on a rotor and a stator with windings. The apparatus includes an observer that is adapted to determine an estimated temperature of the permanent magnet as a function of the temperature of the windings, and determine at least one actuating signal for controlling the DC motor as a function of the estimated temperature of the permanent magnet.
Claims6
An apparatus for controlling a brushless DC motor with a permanent magnet arranged on a rotor and a stator with windings, the apparatus comprising:
- a winding temperature unit determining a temperature of the windings;
- a first observer adapted to determine an estimated temperature of the permanent magnet as a function of the determined temperature of the windings, and determine at least one actuating signal for controlling the DC motor as a function of the estimated temperature of the permanent magnet;
- and
- a second observer adapted to determine an estimated start temperature of the permanent magnet when the DC motor is switched on as a function of a time period since the last time the DC motor was switched off.
A method for controlling a brushless DC motor with a permanent magnet arranged on a rotor and a stator with windings, the method comprising:
- determining a temperature of the windings;
- determining, by an observer, an estimated temperature of the permanent magnet as a function of the temperature of the windings;
- determining at least one actuating signal for controlling the DC motor as a function of the estimated temperature of the permanent magnet;
- and
- determining by a second observer an estimated start temperature of the permanent magnet when the DC motor is switched on as a function of a time period since the last time the DC motor was switched off.
Dependencies are inferred from the claim text.