# US 11,909,343 B2 · Motor-driving apparatus

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- Number: US 11,909,343 B2
- Document ID: US11909343B2
- Status: Granted
- Kind: B2
- Application number: 17/842,939
- Filed: 2022-06-17
- Published: 2022-10-06
- Granted: 2024-02-20
- Earliest claimed: 2020-03-30
- Assignees: Hyundai Motor Company; Kia Corporation
- Applicants: Hyundai Motor Company; Kia Corporation
- Inventors: Kang Ho Jeong; Jong Kyong Lim; Suk Hyun Lim; Ji Woong Jang; Beom Sik Kim; Sang Cheol Shin
- Web page: https://patentgrep.com/patent/US11909343B2

## CPC

- H02P 27/08: with pulse width modulation
- B60L 15/007: {Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles}
- B60L 15/08: using pulses
- B60L 15/2045: {for optimising the use of energy}
- B60L 50/51: characterised by AC-motors
- G01R 19/16538: {in AC or DC supplies (G01R19/16519 and G01R19/16528 take precedence)}
- H02M 7/53871: {with automatic control of output voltage or current}
- H02P 25/184: {wherein the motor speed is changed by switching from a delta to a star, e.g. wye, connection of its windings, or vice versa}
- B60L 2210/40: DC to AC converters
- B60L 2220/54: Windings for different functions
- B60L 2220/56: with switched windings
- B60L 2240/421: Speed
- B60L 2240/527: Voltage
- H02M 7/493: the static converters being arranged for operation in parallel
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

A motor-driving apparatus for driving a motor having a plurality of windings respectively corresponding to a plurality of phases is provided. The motor-driving apparatus includes a first inverter having a plurality of first switching devices and connected to first ends of the plurality of windings and a second inverter having a plurality of second switching devices and connected to second ends of the plurality of windings. A third switching device is configured to selectively connect and disconnect points at which a number of turns of each of the windings is divided in a preset ratio. A controller is configured to adjust an on/off state of the first to third switching devices based on required output of the motor.

## Claims

### Claim 1

A motor-driving apparatus for driving a motor having a plurality of windings corresponding to a plurality of phases, respectively, comprising:
a first inverter including a plurality of first switching devices and connected to first ends of the plurality of windings;
a second inverter including a plurality of second switching devices and connected to second ends of the plurality of windings;
a third switching device including a plurality of switching devices; and
a controller configured to adjust an on/off state of the first to third switching devices based on a required output of the motor,
wherein the plurality of switching devices have first-side ends respectively connected to the specific points of the plurality of windings, and second-side ends connected to each other, and
when the required output of the motor is greater than a preset reference value, the controller is configured to turn off the third switching device and drive the motor by performing pulse-width modulation control on the first switching device and the second switching device;
wherein each of the plurality of switching devices of the third switching device corresponds to different one of the plurality of phases, and
wherein each of the plurality of switching devices of the third switching device comprises a power semiconductor.

### Claim 2 (depends on 1)

The motor-driving apparatus of claim 1, wherein the third switching device is configured to selectively connect and disconnect the specific points at which a number of turns of each of the windings is divided in a preset ratio.

### Claim 3 (depends on 1)

The motor-driving apparatus of claim 1, wherein, when the required output of the motor is less than the preset reference value, the controller is configured to turn on the third switching device and drive the motor by performing pulse-width modulation control on the first switching device.

### Claim 4 (depends on 3)

The motor-driving apparatus of claim 3, wherein the preset ratio is N1:N2, and a coil with a number of turns corresponding to the N1 is connected to the first inverter in a form of a Y-connection by turning on the third switching device.

### Claim 5 (depends on 4)

The motor-driving apparatus of claim 4, wherein the N1 is determined to make a region corresponding to a main driving point of a vehicle to which the motor is applied belong to a region in which a voltage utilization rate of the inverter is equal to or greater than a preset reference value, at which the voltage utilization rate of the inverter is determined to be optimized, in a motor-revolutions-per-minute (RPM)/motor-torque relationship.

### Claim 6 (depends on 1)

The motor-driving apparatus of claim 1, wherein the preset ratio is N1:N2, and opposite ends of a coil having a number of turns corresponding to N1+N2 are connected to the first and second inverters by turning off the third switching device, and the motor is driven as an open-end winding motor.

### Claim 7

A motor-driving apparatus for driving a motor having a plurality of first windings corresponding to a plurality of phases, respectively, comprising:
a first inverter including a plurality of first switching devices and connected to first ends of the plurality of first windings;
a second inverter including a plurality of second switching devices;
a plurality of third switching devices having first-side ends connected to second ends of the plurality of first windings, respectively, and having second-side ends connected to each other; and
a controller configured to form a Y-connection by turning on the plurality of third switching devices and to drive the motor by performing pulse-width modulation control on the plurality of first switching devices when a required output of the motor is less than a preset reference value, and to turn off the third switching device and to drive the motor as an open-end winding motor by performing pulse-width modulation control on the first and second switching devices when the required output of the motor is equal to or greater than the reference value;
wherein each of the plurality of switching devices of the third switching device corresponds to different one of the plurality of phases, and
wherein each of the plurality of switching devices of the third switching device comprises a power semiconductor.

### Claim 8 (depends on 7)

The motor-driving apparatus of claim 7, wherein the motor further includes a plurality of second windings corresponding to the plurality of phases, respectively, and
wherein first-side ends of the plurality of second windings are connected to the first-side ends of the plurality of third switching devices, respectively, and second-side ends of the plurality of second windings are connected to the second inverter.

### Claim 9 (depends on 8)

The motor-driving apparatus of claim 8, wherein a first number of turns of the plurality of the first windings and a second number of turns of the plurality of the second windings meet a preset ratio.

### Claim 10 (depends on 9)

The motor-driving apparatus of claim 9, wherein the preset ratio is N1:N2, and a coil having a number of turns corresponding to the N1 is connected to the first inverter in a form of a Y-connection by turning on the third switching device.