Rotating electrical machine system
In a rotating electrical machine, a field element includes a field element core to which magnets are fixed. The magnet has a pair of first acting surfaces opposing each other and through which a magnetic flux flows in or flows out, and a second acting surface serving as an inflow surface or an outflow surface for magnetic flux in a q-axis-side end portion. Between an acting surface on the armature side of the pair of first acting surfaces and the second acting surface, the magnet has a magnet magnetic path that extends from one acting surface to the other. The field element core has a q-axis-side portion adjacent in the circumferential direction to the acting surface of the magnet. A controller controls an energization phase of phases of an armature winding to cause a state of magnetic saturation of the q-axis-side portion of the field element core to be variable.
1. A rotating electrical machine system comprising:
a rotating electrical machine that includes a field element that has a magnet portion that includes a plurality of magnetic poles of which polarities alternate in a circumferential direction, and an armature that has a multiple-phase armature winding, in which the field element is a rotor; and
a controller that controls energization of the armature winding and an armature core having a teeth-less structure that does not have teeth in the armature core, wherein
the field element includes a field element core to which magnets that configure the magnet portion are fixed,
each magnet comprises:
a pair of first acting surfaces that oppose each other and through which a magnetic flux flows in or flows out, and a second acting surface that serves as an inflow surface or an outflow surface for magnetic flux in a q-axis-side end portion; and
between an acting surface on the armature side of the pair of first acting surfaces and the second acting surface, a magnet magnetic path that extends from one acting surface to the other,
the field element core has a q-axis-side portion that is adjacent in the circumferential direction to the second acting surface of the magnet,
in two magnets of the magnets that oppose each other via the q-axis-side portion between two magnetic poles of the plurality of magnetic poles that are adjacent in the circumferential direction, the magnet magnetic path extends from the second acting surface of one of the two magnets to the second acting surface of the other of the two magnets via the q-axis-side portion,
the controller controls an energization phase of the phases of the armature winding to cause a state of magnetic saturation of the q-axis-side portion of the field element core to be variable,
the armature winding includes conductor portions that are arranged at predetermined intervals in the circumferential direction in a position opposing the field element, and
in the armature,
an inter-conductor member is provided between the conductor portions in the circumferential direction, and a magnetic material is used as the inter-conductor member, the magnetic material meeting a relation of Wt×Bs≤Wm×Br, where Wt is a width dimension in the circumferential direction of the inter-conductor member for a single magnetic pole, Bs is a saturation magnetic flux density of the inter-conductor member, Wm is a width dimension in the circumferential direction of the magnet portion for a single magnetic pole, and Br is a remanent flux density of the magnet portion, and
the inter-conductor member is provided integrally with the armature core as a protruding portion that extends in the radial direction.
2. The rotating electrical machine system according to claim 1 , wherein:
the second acting surface includes a pair of second acting surfaces;
the magnets of the magnetic poles that are adjacent in the circumferential direction are arranged such that the second acting surfaces oppose each other with a q-axis therebetween;
in the field element core, the q-axis-side portion that is between the magnets that are adjacent in the circumferential direction and includes the q-axis serves as a variable magnetic saturation area that can be magnetically saturated by energization magnetic flux of the armature winding; and
the controller produces magnetic saturation in the variable magnetic saturation area by performing energization control of the armature winding so that a rotating magnetic flux at an orientation that intersects the q-axis is generated.
3. The rotating electrical machine system according to claim 2 , wherein:
a flux barrier is provided in a portion in a radial direction in the q-axis-side portion of the field element core.
4. The rotating electrical machine system according to claim 2 , wherein:
a q-axis-side end surface of the magnet is configured by a first portion that is on the armature side and a second portion that is closer to a counter-armature side than to the first portion, and the first portion is configured to have a greater separation distance in the circumferential direction from the q-axis, compared to the second portion.
5. The rotating electrical machine system according to claim 2 , wherein:
the magnet is a circular-arc-shaped magnet that is provided along a circle that is concentric with the field element core; and
the magnet is configured such that, in a magnet end portion that includes a q-axis-side end surface of the magnet, a separation distance in a radial direction from the armature is greater and a magnet thickness in the radial direction is thinner, compared to that in a portion that is closer to a d-axis side than to the magnet end portion.
6. The rotating electrical machine system according to claim 5 , wherein:
a flux barrier is provided on the q-axis of the field element core, in a position that is closer to the armature side than to the variable magnetic saturation area.
7. The rotating electrical machine system according to claim 2 , wherein:
the field element is a rotor; and
a recessing portion is provided on a peripheral surface on the armature side of the field element core, on the q-axis, in a position that is closer to the armature side than to the variable magnetic saturation area.
8. The rotating electrical machine system according to claim 1 , wherein:
in the magnet, a magnet magnetic path thereof has a circular arc shape that protrudes towards a side opposite the armature.
9. The rotating electrical machine system according to claim 1 , wherein:
in the magnet, portions of the magnet near the second acting surface have a magnet magnetic path orientation that is closer to the circumferential direction than portions located closer to a d-axis.
10. The rotating electrical machine system according to claim 1 , wherein:
the field element includes, as the magnets, a first magnet that is provided on a d-axis of each magnetic pole and a second magnet that is provided on a q-axis that is between the first magnets of the magnetic poles in the circumferential direction;
in the second magnet, one of end surfaces on both sides in the circumferential direction opposing a q-axis-side end surface of the first magnet is a magnetic flux inflow surface through which the magnetic flux flows in and the other is a magnetic flux outflow surface through which the magnetic flux flows out; and
in the field element core, a portion between the first magnet and the second magnet in the circumferential direction is the q-axis-side portion.
11. The rotating electrical machine system according to claim 10 , wherein:
in the field element core, the q-axis-side portion protrudes closer to the armature side than to the first magnet.