D-C commutator motor with means for interference suppression
AssigneeSiemens Aktiengesellschaft
InventorsHeinz-Ulrich Gaebel, Heinrich Kirchner, Vladimir Maxa, Udo Winter
Life of this patent
Estimating the term…
Abstract
In order to improve the interference suppression of an electric-motor auxiliary motor-vehicle drive, particularly in the direction of electromagnetic compatibility (EMV), a protective circuit branch (2, 3) with two Zener diodes (D1; D2) or with one varistor (V1) is provided parallel to the armature circuit branch (1) of the commutator motor (M), where, for reducing the number of external solder joints, the Zener-diodes (D1; D2) or the varistor (V1) are combined with the interference suppression capacitors (C1; C2) in common integration component (6) which has only three external terminals.
Claims7
In a d-c commutator motor having interference suppression means and wherein reversal of the direction of rotation is effected by polarity reversal of the operating voltage of an armature winding supplied from a d-c network, the improvement in interference suppression means comprising
- (a) a protective circuit branch electrically connected in parallel to the armature winding, including at least two zener diodes (D1;
- D2) connected in anti-series;
- the breakthrough voltage of said at least two zener diodes in each direction of current being higher than the operating voltage;
- (b) a plurality of interference suppression inductances each electrically connected in series with each lead of the armature winding;
- (c) at least two interference suppression capacitors connected in series to one another and then electrically connected in parallel to the armature winding;
- and
- (d) said protective circuit branch being connected between the series-connected capacitors (C1;
- C2) and the terminals of the interference suppression inductance (L1;
- L2) on the side of the operating voltage.
In a d-c commutator motor having interference suppression means and wherein reversal of the direction of rotation is effected by changing the polarity of the supply voltage to the armature winding fed from a d-c network, the improvement in interference suppression means comprising
- (a) a protective circuit branch electrically connected in parallel to the armature winding, including at least one varistor (V1), the threshold voltage of said at least one variator in each direction of current being higher than the supply voltage;
- (b) a plurality of interference suppression inductances each electrically connected in series with each lead of the armature winding;
- (c) at least two interference suppression capacitors connected in series to one another and then electrically connected in parallel to the armature winding;
- and
- (d) said protective circuit branch being connected between the series-connected capacitors (C1;
- C2) and the terminals of the interference suppression inductances (L1;
- L2) on the side of the supply voltage.
Dependencies are inferred from the claim text.