US 11,784,592 B2
Control device and method for reducing the commutation angle error of an EC motor
Jens Krotsch, Niederstetten (DE); Thomas Ley, Weikersheim-Laudenbach (DE); and Hiren Gondaliya, Baden-Baden (DE)
Assigned to ebm-papst Mulfingen GmbH & Co. KG, Mulfingen (DE)
Filed by ebm-papst Mulfingen GmbH & Co. KG, Mulfingen (DE)
Filed on Apr. 15, 2021, as Appl. No. 17/231,239.
Claims priority of application No. 10 2020 110 419.7 (DE), filed on Apr. 16, 2020.
Prior Publication US 2021/0328529 A1, Oct. 21, 2021
Int. Cl. G11B 19/28 (2006.01); H02P 6/15 (2016.01); H02P 6/16 (2016.01)
CPC H02P 6/153 (2016.02) [H02P 6/16 (2013.01)] 14 Claims
OG exemplary drawing
 
1. 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.
 
5. 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.
 
10. 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.