Adjustment device for adjusting a relative rotational angle position of two shafts and method for operating an actuator, particularly of such an adjustment device

1. A method of temperature-dependent regulation of energization of an adjusting device for adjusting a relative rotational angle position of a first shaft and a second shaft using an adjusting gear configured as a multi-shaft gear, comprising a driving part connected to the first shaft; a driven part connected to the second shaft; an electric servomotor having a servomotor shaft and temperature sensor; an adjusting shaft connected to the servomotor shaft of the electric servomotor in a rotationally fixed manner; and a control unit having a regulator for energizing the servomotor as a function of temperature determined by the temperature sensor, the method comprising the following steps:

determining a temperature value in the adjusting device via the temperature sensor;

comparing the temperature value with deposited temperature limit values, which distinguish different operation modes of the servomotor from one another; and

regulating a current or a pulse-duty factor of the servomotor as a function of a result of the step of comparing to operate the servomotor in the operation modes.

2. The method according to claim 1 , wherein the step of regulating switches operating modes when a first temperature limit value is exceeded.

3. The method according to claim 1 , wherein the step of regulating comprises providing a separate current regulation or pulse-duty factor regulation for each of a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range.

4. The method according to claim 3 , wherein, when the step of comparing determines the temperature value in the second temperature range, the step of regulating performs a linear, degressive or progressive reduction of the current, which results in a reduced adjusting speed and/or an adjusting magnitude of the servomotor.

5. The method according to claim 4 , wherein, when the step of comparing determines the temperature value in the third temperature range, the step of regulating regulates the current to a reduced value at which the servomotor is adjustable with a minimal adjusting speed.

6. The method according to claim 5 , wherein, when the step of comparing determines the temperature value in the fourth temperature range, the step of regulating regulates the current to a holding current at which the actuator is no longer adjustable but is held at a constant position.

7. The method according to claim 6 , wherein, when the step of comparing determines the temperature value above the fourth temperature range, the electromotor is switched off in order to prevent a destruction of the electromotor.

8. The method according to claim 3 , wherein, when the step of comparing determines the temperature value in the third temperature range, the step of regulating regulates the current to a reduced value at which the servomotor is adjustable with a minimal adjusting speed.

9. The method according to claim 3 , wherein, when the step of comparing determines the temperature value in the fourth temperature range, the step of regulating regulates the current to a holding current at which the actuator is no longer adjustable but is held at a constant position.

10. The method according to claim 3 , wherein, when the step of comparing determines the temperature value above the fourth temperature range, the electromotor is switched off it order to prevent a destruction of the electromotor.

11. The method according to claim 1 , wherein, when the step of comparing determines the temperature value below or around 0° C., the step of regulating performs a temperature gradient limitation in order to prevent a destruction of the electromotor.

12. In a servomotor for an adjusting device for adjusting a relative rotational angle position of a first shaft and a second shaft using, an adjusting gear configured as a multi-shaft gear having a driving part connected to the first shaft, a driven part connected to the second shaft, and an adjusting shaft, the servomotor having a stator, a rotor, and a servomotor shaft connected to the rotor, the adjusting shaft being connected to the servomotor shaft in a rotationally fixed manner, the improvement comprising:

a temperature sensor; and

a control unit having a regulator for energizing the servomotor as a function of a temperature determined by the temperature sensor, the regulator performing a comparison of the temperature determined by the temperature sensor with deposited temperature limit values, which distinguish different operating modes of the servomotor from one another, and regulating a current or pulse-duty factor of the servomotor as a function of a result of the comparison to operate the servomotor in the operation modes.

13. The servomotor according to claim 12 , wherein the temperature sensor is a low-temperature conductor or a high-temperature conductor.

14. The servomotor according to claim 12 , wherein the temperature sensor is arranged adjacent to temperature-critical components and/or at a hottest point in the servomotor.

15. The servomotor according to claim 12 , wherein the servomotor is a brushless DC motor having, at least one Hall sensor arranged on a circuit board, the temperature sensor being arranged adjacent to the Hall sensor on the circuit board.

16. The servomotor according to claim 15 , wherein the Hall sensor and the temperature sensor, which are integrated in the servomotor, are configured as surface-mounted components and/or as wired components.

17. The servomotor according to claim 15 , wherein the temperature sensor is fixed, uncoupled from vibrations, on the circuit board or on the stator.