Control device and method for reducing the commutation angle error of an EC motor
Assigneeebm-papst Mulfingen GmbH & Co. KG
InventorsJens Krotsch, Thomas Ley, Hiren Gondaliya
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Abstract
A control device (1) is configured to reduce the commutation angle error ε of a three-phase (u, v, w) EC motor (2.2) connected via a y-configuration. The three phases (u, v, w) are commutated via a motor control (3) including a rotor position sensor (4) and a control circuit (10). The rotor position sensor (4) senses the relative angular position of the rotor using the neutral-point potential at the neutral point of the y-configuration. The control circuit (10) is configured to impose a desired field weakening current component on the motor control (3) for reducing the commutation angle error ε.
Claims14
A control device configured to reduce the commutation angle error ε of a three-phase EC motor connected in a y-configuration, the three phases being commutated via a motor control, including a rotor position sensor for sensing the relative angular position of the rotor using the neutral-point potential at the neutral point of the y-configuration as well as a control circuit configured to impose a desired field weakening current component on the motor control for reducing the commutation angle error ε, and a FCC calculating unit operably connected to a measurement obtaining unit and a target value specification for inputting a variable field weakening current component to impose a specific field weakening current component on the motor control for reducing the commutation angle error ε.
A method for reducing the commutation angle error ε of a three-phase EC motor connected via a y-configuration, the three phases being commutated via a motor control, comprising:
- sensing a rotor position from the neutral-point potential at the neutral point of the y-configuration of the motor phases;
- imposing a field weakening current component for reducing the commutation angle error ε of a commutation device for commutating the EC motor;
- and
- providing a field weakening current component of constant magnitude.
A method for reducing the commutation angle error ε of a three-phase EC motor connected via a y-configuration, the three phases being commutated via a motor control, comprising:
- sensing a rotor position from the neutral-point potential at the neutral point of the y-configuration of the motor phases;
- and
- imposing a field weakening current component for reducing the commutation angle error ε of a commutation device for commutating the EC motor,
- wherein the field weakening current component is a linear or non-linear function of an operating parameter (Pi) of the EC motor, specifically a function of the torque M or the current of the EC motor.
Dependencies are inferred from the claim text.