Method for determining an offset of an angular position encoder on a rotor shaft of an electric machine
A method for determining an offset of an angular position encoder is associated with a rotor of an electric machine, wherein a reference offset of a reference angular position encoder of a reference electric machine is known at a reference rotational speed and a reference current with a reference phase angle and a reference absolute value. The method includes the steps of applying a current having the reference absolute value; setting a phase angle of the current to achieve the reference rotational speed; comparing the phase angle with the reference phase angle and the reference offset; and determining the offset on the basis of this comparison.
1. A method for determining an offset of an angular position encoder, which is associated with a rotor of an electric machine, wherein a reference offset of a reference angular position encoder of a reference electric machine is known at a reference rotational speed and at a reference current with a reference phase angle and a reference absolute value, said method comprising the following steps:
applying a current having the reference absolute value;
setting a phase angle of the current to achieve the reference rotational speed;
comparing the phase angle with the reference phase angle and the reference offset; and
determining the offset on a basis of this comparison,
wherein the offset is determined at two different reference rotational speeds and a mean value is formed.
2. The method according to claim 1 , wherein the reference rotational speeds have the same absolute value, but are in different rotation directions.
3. The method according to claim 1 , wherein applying the current as an end-of-line test in a case of series production.
4. A method for determining an offset of an angular position encoder, which is associated with a rotor of an electric machine, wherein a reference offset of a reference angular position encoder of a reference electric machine is known at a reference rotational speed and at a reference current with a reference phase angle and a reference absolute value, said method comprising the following steps:
applying a current having the reference absolute value;
setting a phase angle of the current to achieve the reference rotational speed;
comparing the phase angle with the reference phase angle and the reference offset; and
determining the offset on a basis of this comparison,
wherein the reference rotational speed lies in a range between one third and two thirds of a nominal motor rotational speed.