Motor and Motor Control Method

• US 20170222589A1
• Filed: 10/01/2015
• Published: 08/03/2017
• Est. Priority Date: 10/21/2014
• Status: Active Grant

• Current Assignee: Leagic Corporation
• Original Assignee: Leagic Corporation
• Inventors: MATSUNOBU, Toshimi
• Granted Patent: US 10,505,486 B2
• Time in Patent Office: Days
• CPC Class Codes: H02P 25/08 Reluctance motors
• CPC Class Codes: H02P 25/092 Converters specially adapted for controlling reluctance motors
• CPC Class Codes: H02P 3/065 for stopping or slowing a reluctance motor
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

A motor and a control method for making the generating and regeneration efficiency higher than before are provided. A motor including a rotor, a storage battery and a capacitor (a source) is provided to charge a produced electrical energy, a SR motor portion rotates the rotor by magnetic force produced with a current supplied by the source and generates by converting rotational energy of the rotor into electrical energy, current sensors measure the currents supplied to excitation coils, and a semiconductor switching control circuit for driving and generation to maintain the rotation by increasing the current with supply of electrical energy from the source to the excitation coils if the currents measured by the current sensors fall below a predetermined lower limit for making the rotor rotate due to the charging.

Claims

1. A motor comprising:

a rotor;

a source;

rotation element to rotate the rotor by magnetic force produced with a current supplied by the source and to make a generating operation for converting rotational energy of the rotor into electrical energy;

charge element to charge the electrical energy generated by the generating operation;

current quantity measuring element to measure the current supplied to said rotation element; and

control element to increase the current with supply of electrical energy from the source to said rotation element so as to maintain the generating operation if the current measured by said current quantity measuring element falls below a predetermined lower limit for making the generating operation due to the charging.

2. The motor according to claim 1,

wherein, if the current measured by said current quantity measuring element falls below a lower limit for maintaining a regenerating operation, said control element further increases the current by the generation of said rotation element without supplying the current from the source so as to maintain the regenerating operation.

3. The motor according to claim 1,

wherein said source serves as said charge element.

5. The motor according to claim 1,

wherein the motor is a switched reluctance motor, and

wherein said rotation element consists of a three-phase coil and generates the electrical energy with a change of flux in the coil by the rotation of said rotor.

11. The motor according to claim 1,

wherein the motor is a switched reluctance motor, and

wherein said rotation element consists of a three-phase coil and generates the electrical energy with a change of flux in the coil by the rotation of said rotor.

4. A motor comprising:

a rotor;

a source;

rotation element to rotate the rotor by magnetic force produced with a current supplied by the source and to generate by converting rotational energy of the rotor into electrical energy;

current quantity measuring element to measure the current supplied to said rotation element; and

control element to increase the current by the generation of said rotation element without supplying the current from the source so as to maintain a regenerating operation if the current measured by said current quantity measuring element falls below a lower limit for maintaining the regenerating operation.

6. A motor control method for controlling a motor comprising a rotor, a source, rotation element to rotate the rotor by magnetic force produced with a current supplied by the source and to make a generating operation for converting rotational energy of the rotor into electrical energy, and charge element to charge the electrical energy generated by the generating operation, the motor control method comprising:

measuring the current flowing through said rotation element; and

increasing the current with supply of electrical energy from the source to said rotation element so as to maintain the generating operation if the measured current falls below a predetermined lower limit for making the generating operation due to the charging.

7. The motor control method according to claim 6,

wherein the method further comprises increasing the current by the generation of said rotation element without supplying the current from the source so as to maintain a regenerating operation if the measured current falls below a lower limit for maintaining the regenerating operation.

8. The motor control method according to claim 6,

wherein said source serves as said charge element.

12. The motor control method according to claim 6,

wherein the motor is a switched reluctance motor, and

wherein said rotation element consists of a three-phase coil and generates the electrical energy with a change of flux in the coil by the rotation of said rotor.

9. A motor control method for controlling a motor comprising a rotor, a source, and rotation element to rotate the rotor by magnetic force produced with a current supplied by the source and to generate by converting rotational energy of the rotor into electrical energy, the motor control method comprising:

measuring the current flowing through said rotation element;

judging whether the measured current falls below a lower limit for maintaining a regenerating operation; and

increasing the current by the generation of said rotation element without supplying the current from the source so as to maintain the regenerating operation if it is judged to fall below the lower limit in the second step.

10. The motor control method according to claim 9,

wherein the motor is a switched reluctance motor, and

wherein said rotation element consists of a three-phase coil and generates the electrical energy with a change of flux in the coil by the rotation of said rotor.