# US 11,309,812 B1 · Motor system

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- Number: US 11,309,812 B1
- Document ID: US11309812B1
- Status: Granted
- Kind: B1
- Application number: 17/033,960
- Filed: 2020-09-28
- Published: 2022-03-31
- Granted: 2022-04-19
- Earliest claimed: 2020-09-28
- Assignees: Global Mixed-mode Technology Inc.
- Applicants: Global Mixed-mode Technology Inc.
- Inventors: Ching-Feng Lai
- Web page: https://patentgrep.com/patent/US11309812B1

## CPC

- H02P 6/153: {wherein the commutation is advanced from position signals phase in function of the speed}
- H02P 6/16: Circuit arrangements for detecting position
- H02P 6/187: {using the star point voltage}
- H02P 6/26: Arrangements for controlling single phase motors
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

The present invention discloses a motor system without a hall sensing element. The motor system comprises a first output pin, a second output pin, an auxiliary pin, a stator, a rotor, a primary coil, and an auxiliary coil. Both the primary coil and the auxiliary coil surround the stator. The primary coil is coupled to the first output pin and the second output pin. The auxiliary coil is coupled to the auxiliary pin. The auxiliary coil is configured to determine a phase switching time point. The motor system detects the zero point of the voltage of the auxiliary pin, so as to detect the position of the rotor and determine the phase switching time point.

## Claims

### Claim 1

A motor system comprising:
a first output pin;
a second output pin;
an auxiliary pin;
a primary coil, coupled to the first output pin and the second output pin;
an auxiliary coil, coupled to the auxiliary pin; and
a stator, wherein both the primary coil and the auxiliary coil surround the stator, and the motor system determines a phase switching time point based on a zero point of the voltage of the auxiliary pin.

### Claim 2 (depends on 1)

The motor system of claim 1, wherein the motor system determines the phase switching time point by detecting the zero point of the voltage of the auxiliary pin.

### Claim 3 (depends on 1)

The motor system of claim 1, wherein the motor system further comprises a rotor, and the motor system detects a position of the rotor by detecting the zero point of the voltage of the auxiliary pin.

### Claim 4 (depends on 1)

The motor system of claim 1, wherein the primary coil has a first turn number N1, the auxiliary coil has a second turn number N2, and N1/N2 is greater than 1 or equal to 1.

### Claim 5 (depends on 1)

The motor system of claim 1, wherein the motor system is applied to a single-phase brushless DC motor.

### Claim 6 (depends on 1)

The motor system of claim 1, wherein the auxiliary coil is coupled to the first output pin or the second output pin.

### Claim 7 (depends on 1)

The motor system of claim 1, wherein the auxiliary coil is coupled to a reference voltage.

### Claim 8

A motor system comprising:
a first terminal;
a second terminal;
a first auxiliary terminal;
a rotor;
a primary coil, coupled to the first terminal and the second terminal;
an auxiliary coil, coupled to the first auxiliary terminal;
a stator, wherein both the primary coil and the auxiliary coil surround the stator;
a switch circuit, configured to supply a driving current to the primary coil; and
a control unit, configured to generate a plurality of control signals to control the switch circuit, wherein the motor system determines a phase switching time point based on a zero point of the voltage of the first auxiliary terminal.

### Claim 9 (depends on 8)

The motor system of claim 8, wherein the motor system determines the phase switching time point by detecting the zero point of the voltage of the first auxiliary terminal.

### Claim 10 (depends on 8)

The motor system of claim 8, wherein the motor system determines the phase switching time point by detecting a zero point of the driving current.

### Claim 11 (depends on 8)

The motor system of claim 8, wherein the motor system determines the phase switching time point by detecting the zero point of the voltage of the first auxiliary terminal and a zero point of the driving current.

### Claim 12 (depends on 8)

The motor system of claim 8, wherein the motor system detects a position of the rotor by detecting the zero point of the voltage of the first auxiliary terminal.

### Claim 13 (depends on 8)

The motor system of claim 8, wherein the primary coil has a first turn number N1, the auxiliary coil has a second turn number N2, and N1/N2 is greater than 1 or equal to 1.

### Claim 14 (depends on 8)

The motor system of claim 8, wherein the motor system further comprises:
a current detecting unit, configured to detect a zero point of the driving current; and
a voltage detecting unit, configured to detect the zero point of the voltage of the first auxiliary terminal.

### Claim 15 (depends on 8)

The motor system of claim 8, wherein the motor system is applied to a single-phase brushless DC motor.

### Claim 16 (depends on 8)

The motor system of claim 8, wherein the auxiliary coil is coupled to the first terminal or the second terminal.

### Claim 17 (depends on 8)

The motor system of claim 8, wherein the auxiliary coil is coupled to a reference voltage.