Control device and method for controlling a power converter, and electrical drive system
AssigneeRobert Bosch GmbH
InventorsHelge Sprenger, Thomas Zeltwanger
Life of this patent
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Abstract
The invention relates to an expanded control scheme for an electrical machine (2). In particular, it is provided to change specifically into a freewheeling state in the event that only a low torque or a low phase current is to be set at the electrical machine (2). In order to change into the freewheeling state, additionally the actual rotational speed of the electrical machine (2) is taken into consideration.
Claims8
A control device (10) for controlling a power converter (1) in an electrical drive system, wherein the control device (10) is configured to:
- detect a target value (S) for controlling the power converter (1), the target value (S) including a torque to be set in an electrical machine (2) of the drive system,
- determine a speed or an electrical frequency of the electrical machine (2) of the drive system, and
- activate a freewheeling state in the electrical power converter (1) if the detected target value (S) for controlling the power converter (1) falls below a predetermined first threshold value and the determined speed or electrical frequency of the electrical machine (2) falls below a predetermined maximum threshold value.
An electrical drive system comprising:
- an electrical machine (2);
- an electrical power converter (1) configured to control the electrical machine (2) using a target value (S);
- and a control device (10) configured to
- detect a target value (S) for controlling the power converter (1), the target value (S) including a torque to be set in the electrical machine (2) of the drive system,
- determine a speed or an electrical frequency of the electrical machine (2) of the drive system, and
- activate a freewheeling state in the electrical power converter (1) if the detected target value (S) for controlling the power converter (1) falls below a predetermined first threshold value and the determined speed or electrical frequency of the electrical machine (2) falls below a predetermined maximum threshold value.
A method for controlling a power converter (1) in an electrical drive system, with the steps of:
- detecting (S1) a target value (S) for controlling the power converter (1), the target value (S) including a torque to be set in an electrical machine (2) of the drive system,
- determining (S2) a speed or an electrical frequency of an electrical machine (2) of the drive system, and
- activating (S3) a freewheeling state in the electrical power converter (1) if the detected target value (S) and/or actual value for controlling the power converter (1) falls below a predetermined first threshold value and the determined speed or electrical frequency of the electrical machine (2) falls below a predetermined threshold value.
Dependencies are inferred from the claim text.