# US 4,393,339 A · Motor apparatus

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- Number: US 4,393,339 A
- Document ID: US4393339A
- Status: Granted
- Kind: A
- Application number: 06/239,496
- Filed: 1981-03-02
- Granted: 1983-07-12
- Earliest claimed: 1980-03-07
- Assignees: Olympus Optical Co., Ltd.
- Inventors: Kenji Kimura
- Web page: https://patentgrep.com/patent/US4393339A

## CPC

- H02P 6/08: Arrangements for controlling the speed or torque of a single motor (H02P6/10, H02P6/28 take precedence)
- H02P 6/185: using inductance sensing, e.g. pulse excitation
- Y02P 80/10: Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Disclosed is a motor apparatus in which the rotation speed of the rotor is controlled by pulse width changes of drive currents which provide a rotating magnetic field around the rotor. A non-saturated type amplifier with poor efficiency can be removed from the motor power supply circuit, thus enabling the motor power supply circuit to be formed only by a circuit having a switching operation.

## Claims

### Claim 1

A motor apparatus comprising:
a motor including a rotor;
detection means coupled to said motor for providing a detection signals corresponding to a position of said rotor;
converter means coupled to said detection means for providing multiphase pulse signals by slicing off said detection signal at a predetermined threshold level, said multiphase pulse signals being either high or low in level and overlapped with one another in the high level thereof; and
changing means coupled to said converter means for changing said threshold level;
wherein the rotation speed of said rotor is controlled in accordance with said threshold level.

### Claim 2 (depends on 1)

A motor apparatus according to claim 1, wherein said motor comprises exciting coils, and further comprising means coupled to said motor and to said converter means, for driving said exciting coils of said motor according to said multiphase pulse signals.

### Claim 3

A motor apparatus comprising:
a motor including a rotor;
detection means coupled to said motor for providing detection signals corresponding to respective positions of said rotor;
converter means coupled to said detection means for providing multiphase pulse signals by slicing off said detection signals at a predetermined threshold level; and
changing means coupled to said converter means for changing said threshold level;
said converter means including comparators for comparing said detection signals with at least one predetermined threshold level and providing said multiphase pulse signals when said detection signals exceed said at least one predetermined threshold level;
wherein the rotation speed of said rotor is controlled in accordance with said threshold level.

### Claim 4

A motor apparatus comprising:
a motor including a rotor;
detection means coupled to said motor for providing a detection signal corresponding to a position of said rotor;
converter means coupled to said detection means for providing multiphase pulse signals by slicing off said detection signal at a predetermined threshold level; and
changing means coupled to said converter means for changing said threshold level;
said detection means including means for converting a magnitude of a magnetic field corresponding to a position of said rotor to an electrical field;
wherein the rotation speed of said rotor is controlled in accordance with said threshold level.

### Claim 5 (depends on 1, 2, 4)

A motor apparatus according to any one of claims 1, 2 or 4 wherein said converter means includes comparators for comparing said detection signals with predetermined threshold levels and providing said multiphase pulse signals when said detection signals exceed said threshold levels.

### Claim 6 (depends on 1, 2, 3)

A motor apparatus according to any one of claims 1, 2 or 3 wherein said detection means includes means for converting a magnitude of a magnetic field corresponding to a position of said rotor to an electrical signal.

### Claim 7 (depends on 5)

A motor apparatus according to claim 5 wherein said detection means includes means for converting a magnitude of a magnetic field corresponding to a position of said rotor to an electrical signal.

### Claim 8

A motor apparatus comprising:
a motor including a rotor and exciting coils;
detection means coupled to said motor for providing first and second detection signals corresponding to the positions of said rotor;
amplifier means coupled to said detection means for providing first and second output signals, said first output signal corresponding to said first detection signal and said second output signals corresponding to said second detection signal;
a first comparator for comparing said first output signal with a first threshold level to provide a first pulse signal;
a second comparator for comparing said first output signal with a second threshold level to provide a second pulse signal; p1 a third comparator for comparing said second output signal with said second threshold level to provide a third pulse signal;
a fourth comparator for comparing said second output signal with said first threshold level to provide a fourth pulse signal;
changing means for generating a reference level corresponding to said first and second threshold levels and changing said reference level; and
driver means for applying exciting currents, which correspond to said first through fourth pulse signals, to said exciting coils of said motor, respectively.

### Claim 9 (depends on 8)

A motor apparatus according to claim 8, wherein said first through fourth pulse signals are either high or low in level and are sequentially overlapped with one another in the high level thereof.

### Claim 10

A motor apparatus comprising:
a motor including a rotor and exciting coils;
detection means coupled to said motor for providing first and second detection signals corresponding to the positions of said rotor;
amplifier means coupled to said detection means for providing first and second output signals, said first output signal corresponding to said first detection signal and said second output signal corresponding to said second detection signal;
a first comparator for comparing said first output signal with a first threshold level to provide a first pulse signal;
a second comparator for comparing said first output signal with a second threshold level to provide a second pulse signal;
a third comparator for comparing said second output signal with said second threshold level to provide a third pulse signal;
a fourth comparator for comparing said second output signal with said first threshold level to provide a fourth pulse signal; and
said first through fourth pulse signals being either high or low in level and being sequentially overlapped with one another in the high level thereof.