Rotating electrical machine

1. A rotating electrical machine comprising:

a field generator that includes a magnet unit, the magnet unit having a plurality of magnetic poles whose polarities are alternately arranged in a circumferential direction;

an armature that includes a multi-phase armature winding member, one of the field generator and the armature serving as a rotor of the rotating electrical machine,

the armature winding member including a plurality of conductive members that face the armature and are arrayed at given intervals away from each other in the circumferential direction;

a power converter electrically connected to the armature winding member; and

a processor configured to:

control the power converter to thereby adjust a q-axis current flowing through the armature winding member to a q-axis command current;

determine a value of the q-axis command current in accordance with requirement information and an input command value for a controlled variable of the rotating electrical machine, the requirement information including a relationship between values of the q-axis command current and corresponding command values for the controlled variable;

perform a task of correcting the determined value of the q-axis command current to thereby restrict temperature change in the magnet unit from having an influence on the relationship between the command values for the controlled variable and the corresponding values of the q-axis command current; and

control the power converter to thereby adjust a value of the q-axis current flowing through the armature winding member to the corrected value of the q-axis command current,

wherein the armature has any one of a first configuration and a second configuration,

the first configuration has conductor-to-conductor members, each of the conductor-to-conductor members being disposed between a corresponding adjacent pair of the conductive members of the armature winding member,

the second configuration has no conductor-to-conductor member between each adjacent pair of the conductive members of the armature winding member,

each of the conductor-to-conductor members are made of any one of a magnetic material and a non-magnetic material, and

the magnetic material satisfies the following relation:

Wt×Bs≤Wm×Br

where:

Wt represents a total circumferential width of one or more of the conductor-to-conductor members lying within a range of one of the magnetic poles of the magnet unit;

Bs represents a saturation magnetic flux density of the conductor-to-conductor members;

Wm represents a circumferential width of a portion of the magnet unit equivalent to one of the magnetic poles of the magnet unit; and

Br represents the remanent flux density of the magnet unit.

2. A rotating electrical machine system comprising:

a plurality of the rotating electrical machines of claim 1 , each of the rotating electrical machines being applied to a vehicle equipped with a plurality of driving wheels, the rotating electrical machines being respectively provided for at least two driving wheels in the plurality of driving wheels, each of the rotating electrical machines serving as a power source for rotating the corresponding one of the at least two driving wheels,

wherein the plurality of the processors are individually provided for the respective rotating electrical machines.

3. The rotating electrical machine system according to claim 2 , wherein the plurality of processors are programmed to:

obtain information about a temperature of the corresponding magnet unit; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained temperature information.

4. The rotating electrical machine system according to claim 2 , wherein the plurality of processors are configured to:

obtain an electrical angular velocity of the corresponding one of the rotating electrical machines;

obtain information about a voltage induced in the corresponding armature winding member; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained electrical angular velocity and the information about the induced voltage.

5. A rotating electrical machine system comprising:

a plurality of rotating electrical machines of claim 1 , each of the rotating electrical machines being applied to an aerial vehicle, the rotating electrical machines serving as a power source for flying the aerial vehicle,

the aerial vehicle comprising:

a vehicle body; and

a plurality of thrusters mounted to the vehicle body, each of the thrusters including a propeller,

wherein:

the rotating electrical machines are respectively provided for the propellers; and

the plurality of the processors are individually provided for the respective rotating electrical machines.

6. The rotating electrical machine system according to claim 5 , wherein the plurality of processors are programmed to:

obtain information about a temperature of the corresponding magnet unit; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained temperature information.

7. The rotating electrical machine system according to claim 5 , wherein the plurality of processors are configured to:

obtain an electrical angular velocity of the corresponding one of the rotating electrical machines;

obtain information about a voltage induced in the corresponding armature winding member; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained electrical angular velocity and the information about the induced voltage.

8. The rotating electrical machine according to claim 1 , wherein the processor is configured to:

obtain information about a temperature of the magnet unit; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained temperature information.

9. The rotating electrical machine according to claim 8 , wherein the processor is configured to:

obtain an electrical angular velocity of the rotating electrical machine;

obtain information about a voltage induced in the armature winding member; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained electrical angular velocity and the information about the induced voltage.

10. The rotating electrical machine according to claim 1 , wherein the processor is configured to:

obtain an electrical angular velocity of the rotating electrical machine;

obtain information about a voltage induced in the armature winding member; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained electrical angular velocity and the information about the induced voltage.

11. A rotating electrical machine system comprising:

a plurality of rotating electrical machines, each of the rotating electrical machines being applied to a vehicle equipped with a plurality of driving wheels, the rotating electrical machines being respectively provided for at least two driving wheels in the plurality of driving wheels, each of the rotating electrical machines serving as a power source for rotating the corresponding one of the at least two driving wheels, each of the rotating electrical machines comprising:

a field generator that includes a magnet unit, the magnet unit having a plurality of magnetic poles whose polarities are alternately arranged in a circumferential direction;

an armature that includes a multi-phase armature winding member, one of the field generator and the armature serving as a rotor of the rotating electrical machine, the armature including conductor-to-conductor members that are made of any one of a magnetic material and a non-magnetic material; and

a power converter electrically connected to the armature winding member; and

a plurality of processors individually provided for the respective rotating electrical machines, the plurality of processors being each configured to:

control the respective power converter to thereby adjust a q-axis current flowing through the armature winding member to a q-axis command current;

determine a value of the q-axis command current in accordance with requirement information and an input command value for a controlled variable of the corresponding rotating electrical machine, the requirement information including a relationship between values of the q-axis command current and corresponding command values for the controlled variable;

perform a task of correcting the determined value of the q-axis command current to thereby restrict temperature change in the corresponding magnet unit from having an influence on the relationship between the command values for the controlled variable and the corresponding values of the q-axis command current; and

control the corresponding power converter to thereby adjust a value of the q-axis current flowing through the armature winding member to the corrected value of the q-axis command current,

wherein the magnetic material satisfies the following relation:

Wt×Bs≤Wm×Br

where:

Wt represents a total circumferential width of one or more of the conductor-to-conductor members lying within a range of one of the magnetic poles of the magnet unit;

Bs represents a saturation magnetic flux density of the conductor-to-conductor members;

Wm represents a circumferential width of a portion of the magnet unit equivalent to one of the magnetic poles of the magnet unit; and

Br represents the remanent flux density of the magnet unit.

12. The rotating electrical machine system according to claim 11 , wherein the plurality of processors are programmed to:

obtain information about a temperature of the corresponding magnet unit; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained temperature information.

13. The rotating electrical machine system according to claim 11 , wherein the plurality of processors are configured to:

obtain an electrical angular velocity of the corresponding one of the rotating electrical machines;

obtain information about a voltage induced in the corresponding armature winding member; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained electrical angular velocity and the information about the induced voltage.

14. A rotating electrical machine system comprising:

a plurality of rotating electrical machines, each of the rotating electrical machines being applied to an aerial vehicle, the rotating electrical machines serving as a power source for flying the aerial vehicle, the aerial vehicle comprising: a vehicle body; and a plurality of thrusters mounted to the vehicle body, each of the thrusters including a propeller, the rotating electrical machines being respectively provided for the propellers, each of the rotating electrical machines comprising:

a field generator that includes a magnet unit, the magnet unit having a plurality of magnetic poles whose polarities are alternately arranged in a circumferential direction;

an armature that includes a multi-phase armature winding member, one of the field generator and the armature serving as a rotor of the rotating electrical machine, the armature including conductor-to-conductor members that are made of any one of a magnetic material and a non-magnetic material; and

a power converter electrically connected to the armature winding member; and

a plurality of processors individually provided for the respective rotating electrical machines, the processors being each configured to:

control the power converter to thereby adjust a q-axis current flowing through the armature winding member to a q-axis command current;

determine a value of the q-axis command current in accordance with requirement information and an input command value for a controlled variable of the corresponding rotating electrical machine, the requirement information including a relationship between values of the q-axis command current and corresponding command values for the controlled variable; and

a corrector configured to perform a task of correcting the determined value of the q-axis command current to thereby restrict temperature change in the corresponding magnet unit from having an influence on the relationship between the command values for the controlled variable and the corresponding values of the q-axis command current; and

control the power converter to thereby adjust a value of the q-axis current flowing through the armature winding member to the corrected value of the q-axis command current,

wherein the magnetic material satisfies the following relation:

Wt×Bs≤Wm×Br

where:

Wt represents a total circumferential width of one or more of the conductor-to-conductor members lying within a range of one of the magnetic poles of the magnet unit;

Bs represents a saturation magnetic flux density of the conductor-to-conductor members;

Wm represents a circumferential width of a portion of the magnet unit equivalent to one of the magnetic poles of the magnet unit; and

Br represents the remanent flux density of the magnet unit.

15. The rotating electrical machine system according to claim 14 , wherein the plurality of processors are programmed to:

obtain information about a temperature of the corresponding magnet unit; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained temperature information.

16. The rotating electrical machine system according to claim 14 , wherein the plurality of processors are configured to:

obtain an electrical angular velocity of the corresponding one of the rotating electrical machines; and

obtain information about a voltage induced in the corresponding armature winding member; and

perform, as the task of correcting the value of the q-axis command current, a task of correcting the value of the q-axis command current in accordance with the obtained electrical angular velocity and the information about the induced voltage.