Capacitance reductions
Assigneeebm-papst Mulfingen GmbH & Co. KG
InventorRalph Wystup
Life of this patent
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Abstract
The disclosure relates to a method for reducing the torque ripple and noise evolution in an EC motor with single-phase feed by buffer-storing electrical energy in the EC motor, which is embodied with a power factor correction circuit (PFC) having a capacitor (Cz) at the power supply system input for a specific power supply system AC voltage UN, wherein the capacitance of the capacitor is dimensioned such that when the power supply system AC voltage UN is applied, a pulsating DC voltage is generated in a link circuit (Z), wherein the pulsating electrical energy generated as a result is stored by means of a primary regulation of the id current component as magnetic energy in the EC motor at least for a predefined time period.
Claims11
A method for reducing torque ripple and noise evolution in an electronically commutated (EC) motor with single-phase feed and a power factor correction circuit (PFC) having a capacitor at a power supply system input for a specific power supply system AC voltage UN, the method comprising:
- dimensioning the capacitance of the capacitor (CZ) such that when the power supply system AC voltage UN is applied, a pulsating DC voltage is generated in a link circuit (Z);
- and
- buffer-storing electrical energy in the EC motor, wherein the pulsating electrical energy generated in the link circuit (Z) is stored by means of a primary regulation of an id current component as magnetic energy in the EC motor at least for a predefined time period.
A circuit arrangement for an electronically commutated (EC) motor having a link circuit (Z) and which can be supplied with a single-phase feed, comprising:
- a. a power supply system input for connecting to at least one specific power supply system voltage UN,
- b. a power factor correction circuit (PFC) having a capacitor (CZ) on the side of the power supply system input, wherein the capacitance of the capacitor (CZ) is dimensioned such that when a power supply system voltage UN is applied, a pulsating DC voltage UZK is generated in the link circuit (Z),
- c. a primary regulating device comprising a trajectory plan (TP) and a flatness-based state regulator (FZ) which is configured to regulate an id current component in such a manner that the pulsating electrical energy can be stored as magnetic energy in the EC motor at least for a predefined period of time.
Dependencies are inferred from the claim text.