Method for determining the position of a rotor of an electric motor without sensors
AssigneeConti Temic microelectronic GmbH
InventorsJovan Knezevic, Wolfgang Schulter, Gernot Etzlstorfer, Erich Liepold
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Abstract
Disclosed is a method for detecting the current position of a rotor, in particular the angle of rotation of the rotor, an electromotor and a method for detecting the speed and/or the angle of rotation of an electromotor. The speed of the electromotor is hereby implied inter alia from the number of zero crossings of a comparison signal of the armature resistances or respectively conductances determined continuously in time and the average values of the armature resistances or respectively conductances determined continuously in time.
Claims14
A method for detecting a current position of a rotor of a mechanically switched electromotor, the method comprising:
- determining a current value of an armature resistance (Rest(t)) continuously in time (t) for an armature of a mechanically switched electromotor;
- determining the current position (Theta/θ) of the rotor of the mechanically switched electromotor based on the current value of the armature resistance (Rest(t));
- determining an average value (Rmean) of the armature resistance and comparing the determined value of the armature resistance (Rest(t)) to the average value (Rmean), wherein the number of agreements of the current value of the armature resistance (Rest(t)) with the average value (Rmean) of the armature resistance is determined and utilized for determining the current position (Theta/θ) of the rotor.
A method for detecting at least one of a speed or angle of rotation (Theta/θ) of an electromotor, the method comprising:
- determining a current value of the armature resistance (Rest(t)) or armature conductance of the electromotor continuously in time;
- determining an average value (Rmean) of the armature resistance (Rest(t)) or armature conductance of the electromotor;
- comparing the current value of the armature resistance (Rest(t)) or armature conductance to the average value (Rmean);
- determining at least one of the speed or angle of rotation of the electromotor by changing the armature resistance (Rest(t)) or armature conductance of the electromotor with respect to the average value (Rmean);
- comparing the determined value of the armature resistance (Rest(t)) to the average value (Rmean), wherein the number of agreements of the current value of the armature resistance (Rest(t)) with the average value (Rmean) of the armature resistance is determined and utilized for determining the current position (Theta/θ) of the rotor.
A method for detecting at least one of a speed or angle of rotation (Theta/θ) of an electromotor, the method comprising:
- determining a current value of the armature resistance (Rest(t)) or armature conductance of the electromotor continuously in time;
- determining an average value (Rmean) of the armature resistance (Rest(t)) or armature conductance of the electromotor;
- comparing the current value of the armature resistance (Rest(t)) or armature conductance to the average value (Rmean);
- and
- determining at least one of the speed or angle of rotation of the electromotor by changing the armature resistance (Rest(t)) or armature conductance of the electromotor with respect to the average value (Rmean), wherein a look-up table is created for values of the armature resistance (Rest(t)) or conductance, which are present temporally with revolution of the electromotor or respectively rotor of the electromotor.
Dependencies are inferred from the claim text.