Power supply unit and electric machine
The invention relates to a power supply unit for supplying multiple conductor portions ( 3 ) of a stator winding of an electric machine which are inserted in respective slots ( 2 ), wherein the power supply unit is configured to supply a first conductor portion and a second conductor portion with at least one different operating parameter of a respective current function and/or the power supply unit is configured to supply a conductor portion with at least two superimposed current functions, which in each case have at least one different operating parameter. Furthermore, the invention relates to an electric machine having such a power supply unit.
1. A power supply unit for supplying multiple conductor portions of a stator winding of an electric machine inserted in respective slots, wherein
the power supply unit is configured to supply a first conductor portion and a second conductor portion with at least one different operating parameter of a respective current function, and/or
the power supply unit is configured to supply a conductor portion with at least two superimposed current functions, which in each case have at last one different operating parameter.
2. The power supply unit according to claim 1 , wherein the conductor portions each have a terminal connected to the power supply unit, and another terminal
which is connected to a short circuit device, wherein the conductor portions are short-circuited to one another, or
which is connected to another power supply unit.
3. The power supply unit according to claim 1 or 2 , wherein the operating parameters include at least one of a pole pair number, frequency, phase position and amplitude.
4. The power supply unit according to claim 1 , which includes a superposition of at least two pole pairs.
5. The power supply unit according to claim 4 , wherein the current function comprises different amplitudes for different pole pairs.
6. The power supply unit according to claim 4 or 5 , wherein the current function comprises different frequencies for different pole pairs.
7. The power supply unit according to claim 1 , which uses synchronous and asynchronous portions for generation of torque at the same time.
8. The power supply unit according to claim 1 , wherein the number of pole pairs is changeable during operation.
9. The power supply unit according to claim 1 , wherein the number of active phases is changeable during operation.
10. The power supply unit according to claim 1 wherein the number of the actively supplied conductor portions is changeable during operation.
11. The power supply unit according to claim 1 , which is configured to supply the conductor portions of the stator winding with a pattern of active phases, wherein said pattern may be fixed, alternating or rotating, or a combination thereof.
12. The power supply unit according to claim 1 , which is configured to supply the conductor portions with asymmetric distributions of the magnetomotive force.
13. The power supply unit according to claim 1 , which is configured to generate time-dependent current courses for supplying the conductor portions, which conform to the following function:
I
S
,
k
(
t
)
=
∑
i
=
p
0
p
max
∑
j
=
f
0
f
max
A
i
,
j
,
k
(
t
)
·
cos
(
2
π
jt
-
i
(
k
-
1
)
2
π
Q
s
+
φ
i
,
j
,
k
(
t
)
)
with I s,k (t) being the time-dependent current course, corresponding to the time-dependent current function in a conductor portion of the stator having consecutive numbering k,
A i,j,k (t) being the time-dependent amplitude of each spectral component of the conductor portion k, wherein the spectral component refers to a component of the current function for example in the case of a Fourier decomposition,
j being the frequency of the spectral component; with f o being a first frequency and f max being the maximum occurring frequency,
i being the pole pair number of the spectral component; with p o being a first pole pair number and p max being the maximum occurring pole pair number,
Q s being the number of slots in the stator and thus also the number of conductor portions in the stator, and
φ i,j,k (t) being the time-dependent phase angle of each spectral component of the conductor portion k.
14. An electric machine having a stator, comprising a power supply unit according to claim 1 , wherein:
the stator comprises a multitude of slots for accommodating the stator winding,
in each case one conductor portion of the stator winding is inserted per slot,
the conductor portions are each connected to a terminal of the power supply unit on a second side of the stator, and
on a first side of the stator opposite the second side the conductor portions are short-circuited or connected to another power supply unit.
15. The electric machine according to claim 14 , wherein each of the conductor portions inserted in the slots is straight.
16. The electric machine according to claim 14 or 15 , wherein each of the conductor portions inserted in the slots include aluminum rods, cooper rods or bronze rods or alloys thereof.