Current supply system, electric power supply system, and control device

Patent metadata

Field	Value
Publication number	US-10493833-B2
Application number	US-201715587520-A
Country	US
Kind code	B2
Filing date	May 5, 2017
Priority date	Nov 25, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A current supply system configured to receive a rotational driving force and supply a current for driving an electrical load device in accordance with a current requirement. The current supply system includes a rotor, including a permanent magnet, configured to receive the rotational driving force, and a stator including a stator core with a winding wound thereon, a magnetic circuit for the winding passing through the stator core, the rotational driving force causing the rotor and the stator to generate the current. The current supply system further includes a supply current adjustment device configured to change magnetic resistance of the magnetic circuit for the winding in accordance with the current requirement, to thereby change an inductance of the winding to adjust the generated current.

First claim

The invention claimed is:

1. A current supply system configured to receive a rotational driving force and supply a current for driving an electrical load device in accordance with a current requirement, the current supply system comprising:
a rotor, including a permanent magnet, configured to receive the rotational driving force;
a stator including
a stator core, and
a winding wound around the stator core, at least one portion of the stator core and the winding being movable relative to each other,

a magnetic circuit for the winding passing through the stator core, the rotational driving force causing the rotor and the stator to generate the current; and
a supply current adjustment device configured to change magnetic resistance of the magnetic circuit for the winding in accordance with the current requirement, to thereby switch between a low-resistance state and a high-resistance state, and to thereby change an inductance of the winding to adjust the generated current, wherein
for each rotation speed of the rotational driving force, the current generated by the stator is of a first amount and a second amount when the supply current adjustment device is in the low-resistance state and the high-resistance state, respectively, the first amount being larger than the second amount when said each rotation speed is lower than a threshold, and smaller than the second amount when said each rotation speed is higher than the threshold, and
the supply current adjustment device is configured to, responsive to receipt of the current requirement,
switch from the low-resistance state to the high-resistance state when a rotation speed of the received rotational driving force is higher than the threshold, and
switch from the high-resistance state to the low-resistance state when the rotation speed of the received rotational driving force is lower than the threshold.

2. The current supply system according to claim 1 , wherein
the magnetic circuit for the winding passes through the stator core, and includes at least a non-magnetic gap between the winding and the rotor, and
the supply current adjustment device adjusts the current to be supplied to the electrical load device, by changing magnetic resistance of the non-magnetic gap between the winding and the rotor, to thereby change the inductance of the winding.

3. The current supply system according to claim 1 , wherein
the magnetic circuit for the winding passes through the stator core, and includes at least one non-magnetic gap, and
the supply current adjustment unit adjusts the current to be supplied to the electrical load device, by changing the inductance of the winding, the inductance of the winding being changed by changing magnetic resistance of, among the at least one non-magnetic gap, a non-magnetic gap whose magnetic resistance is highest when the inductance of the winding is set to a highest settable value.

4. The current supply system according to claim 3 , wherein
the rotor generates a magnetic flux linked with the winding, and
the supply current adjustment device adjusts the supply current by changing the inductance of the winding at a change rate that is higher than a change rate of the magnetic flux linked with the winding.

5. The current supply system according to claim 4 , wherein the supply current adjustment device adjusts the current to be supplied to the electrical load device, by changing the magnetic resistance of the magnetic circuit for the winding, the winding passing through the stator core, the change of the magnetic resistance being implemented by moving at least a portion of the stator core relative to the winding in accordance with the current requirement.

6. The current supply system according to claim 3 , wherein the supply current adjustment device adjusts the current to be supplied to the electrical load device, by changing the magnetic resistance of the magnetic circuit for the winding, the winding passing through the stator core, the change of the magnetic resistance being implemented by moving at least a portion of the stator core relative to the winding in accordance with the current requirement.

7. The current supply system according to claim 2 , wherein
the rotor generates a magnetic flux linked with the winding, and
the supply current adjustment device adjusts the supply current by changing the inductance of the winding at a change rate that is higher than a change rate of the magnetic flux linked with the winding.

8. The current supply system according to claim 7 , wherein the supply current adjustment device adjusts the current to be supplied to the electrical load device, by changing the magnetic resistance of the magnetic circuit for the winding, the winding passing through the stator core, the change of the magnetic resistance being implemented by moving at least a portion of the stator core relative to the winding in accordance with the current requirement.

9. The current supply system according to claim 2 , wherein the supply current adjustment device adjusts the current to be supplied to the electrical load device, by changing the magnetic resistance of the magnetic circuit for the winding, the winding passing through the stator core, the change of the magnetic resistance being implemented by moving at least a portion of the stator core relative to the winding in accordance with the current requirement.

10. The current supply system according to claim 1 , wherein
the magnetic circuit for the winding passes through the stator core, and includes at least one non-magnetic gap, and
the supply current adjustment unit adjusts the current to be supplied to the electrical load device, the adjustment being implemented by changing the inductance of the winding, the inductance of the winding being changed by changing magnetic resistance of, among the at least one non-magnetic gap, a non-magnetic gap whose magnetic resistance is highest when the inductance of the winding is set to a highest settable value.

11. The current supply system according to claim 10 , wherein
the rotor generates a magnetic flux linked with the winding, and
the supply current adjustment device adjusts the supply current by changing the inductance of the winding at a change rate that is higher than a change rate of the magnetic flux linked with the winding.

12. The current supply system according to claim 11 , wherein the supply current adjustment device adjusts the current to be supplied to the electrical load device, by changing the magnetic resistance of the magnetic circuit for the winding, the winding passing through the stator core, the change of the magnetic resistance being implemented by moving at least a portion of the stator core relative to the winding in accordance with the current requirement.

13. The current supply system according to claim 10 , wherein the supply current adjustment device adjusts the current to be supplied to the electrical load device, by changing the magnetic resistance of the magnetic circuit for the winding, the winding passing through the stator core, the change of the magnetic resistance being implemented by moving at least a portion of the stator core relative to the winding in accordance with the current requirement.

14. The current supply system according to claim 1 , wherein
the rotor generates a magnetic flux linked with the winding, and
the supply current adjustment device adjusts the supply current by changing the inductance of the winding at a change rate that is higher than a change rate of the magnetic flux linked with the winding.

15. The current supply system according to claim 14 , wherei

Assignees

• Yamaha Motor Co Ltd

Inventors

• Hino Haruyoshi

Classifications

• B60K1/00

  Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) · CPC title

• B60W20/19

  for achieving enhanced acceleration · CPC title

• B60W2510/083

  Torque · CPC title

• H02P2101/25

  for combustion engines · CPC title

• B60L50/14

  using DC generators and AC motors · CPC title