Method for controlling the rotational speed or the torque of a motor, rotational speed control system and control device
AssigneeAUMOVIO Germany GmbH
InventorsChristian Gunselmann, Bogdan Budianu, Andreas Donner, Albert Cimpoesu
Life of this patent
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Abstract
A method for controlling the rotational speed or the torque of a motor to protect a suppressor diode in a control device of a vehicle, wherein the suppressor diode converts recuperation energy of the motor into thermal energy comprises determining the current junction temperature and/or diode voltage of the suppressor diode; and controlling the rotational speed or the torque of the motor by means of the current junction temperature and/or diode voltage in such a way that the junction temperature of the suppressor diode does not exceed a predetermined junction temperature limit value.
Claims20
A method for controlling rotational speed or torque of a motor in order to protect a suppressor diode in a control device of a vehicle, wherein the suppressor diode converts recuperation energy of the motor into thermal energy, the method comprising:
- determining at least one of a current junction temperature and a diode voltage of the suppressor diode when current is in a reverse current direction through the diode;
- determining derating information based on the dependency between a power factor and the at least one of the current junction temperature and the diode voltage;
- controlling one of the rotational speed and the torque of the motor based on the derating information such that the junction temperature of the suppressor diode does not exceed a predetermined junction temperature limit value and converting hydraulic energy back into electrical energy by the motor via a spindle screw drive when the motor is operated in recuperation mode.
A rotational speed control system comprising:
- a control loop;
- and
- a computing unit, wherein the computing unit has instructions for:
- determining one of a current junction temperature and a diode voltage of a suppressor diode when current is in a reverse current direction through the diode;
- determining derating information based on the dependency between a power factor and the at least one of the current junction temperature and the diode voltage;
- and
- controlling one of a rotational speed and a torque of a motor based on the derating information such that a junction temperature of the suppressor diode does not exceed a predetermined junction temperature limit value, and
- converting the hydraulic energy back into electrical energy by the motor via a spindle screw drive when the motor is operated in recuperation mode.
A rotational speed control system comprising:
- a motor,
- a suppressor diode for a control device of a vehicle, wherein the suppressor diode converts recuperation energy of the motor into thermal energy, and wherein the suppressor diode has a predetermined junction temperature limit value;
- and
- wherein one of the rotational speed and the torque of the motor are controlled by derating information based on a power factor and one of a current junction temperature and a diode voltage when measured when current is in a reverse current direction to protect the suppressor diode such that the junction temperature of the suppressor diode does not exceed the predetermined junction temperature limit value;
- and
- a spindle screw drive when the motor is operated in recuperation mode so that the hydraulic energy is converted back into electrical energy by the motor via the spindle screw drive.
Dependencies are inferred from the claim text.