Circuit arrangement and electric machine
A circuit arrangement ( 10 ) for controlling a stator winding ( 11 ) of a stator ( 12 ) of an electric machine ( 13 ) is provided. The stator winding ( 11 ) has at least four electrical phases (φ), which are designed to be supplied with a separate phase current (I n ), respectively. A modulation signal (M) is assigned to each electrical phase (φ) and the modulation signals (M) are out of phase with respect to one another so that the stator winding ( 11 ) is designed to generate a rotary field. At least two carrier signals (T) are provided for generating the phase currents (I n ), and the electrical phases (φ) are divided into at least two groups, each of which is assigned a carrier signal (T). The carrier signals (T) have a phase shift (θ) relative to one another. Furthermore, an electric machine ( 13 ) comprising a circuit arrangement ( 10 ) is provided.
1. A circuit arrangement for controlling a stator winding of a stator of an electric machine, wherein:
the stator winding has at least four electrical phases, which are designed to be supplied with a separate phase current, respectively,
a modulation signal is assigned to each electrical phase and the modulation signals are out of phase with respect to one another so that the stator winding is designed to generate a rotary field,
at least two carrier signals are provided for generating the phase currents,
the electrical phases are divided into at least two groups, each of which is assigned a carrier signal, and
the carrier signals have a phase shift relative to one another.
2. The circuit arrangement for controlling a stator winding of a stator of an electric machine according to claim 1 , wherein the modulation signals are shifted relative to one another by
360
N
*
p
degrees and N denotes the number of electrical phases and p is a natural number.
3. The circuit arrangement for controlling a stator winding of a stator of an electric machine according to claim 1 , wherein the frequency of one of the carrier signals is greater than the frequency of the respective modulation signal.
4. The circuit arrangement for controlling a stator winding of a stator of an electric machine according to claim 1 , wherein the respective phase currents are generated by pulse width modulation.
5. The circuit arrangement for controlling a stator winding of a stator of an electric machine according to claim 1 , wherein during operation of the circuit arrangement no voltage occurs which is greater than 60 V.
6. The circuit arrangement for controlling a stator winding of a stator of an electric machine according to claim 1 , wherein the circuit arrangement is designed to be used in hybrid or battery electric vehicles.
7. The circuit arrangement for controlling a stator winding of a stator of an electric machine according to claim 1 , wherein the stator winding is formed by at least four electrically conductive bars, which are each located in a slot in the stator, and wherein each bar forms an electrical phase.
8. The circuit arrangement for controlling a stator winding of a stator of an electric machine according to claim 1 , wherein the at least two groups of the electrical phases each comprise the same number of electrical phases.
9. The circuit arrangement for controlling a stator winding of a stator of an electric machine according to claim 1 , wherein the at least two groups of the electrical phases each comprise different numbers of electrical phases.
10. An electric machine, comprising:
a stator, which comprises at least four slots, in each of which an electrically conductive bar is located, wherein the bars form a stator winding, and each of the bars forms an electrical phase and is designed to be supplied with a separate phase current in each case,
a modulation generator, which is designed to generate a modulation signal for each electrical phase, wherein the modulation signals are out of phase with respect to one another so that the stator winding is designed to generate a rotary field,
a carrier signal generator, which is designed to provide at least two carrier signals for generating the phase currents, wherein:
the electrical phases are divided into at least two groups, each of which is assigned a carrier signal, and
the carrier signals have a phase shift relative to one another.