# US 10,483,899 B2 · Modulation scheme for multiphase machines

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- Number: US 10,483,899 B2
- Document ID: US10483899B2
- Status: Granted
- Kind: B2
- Application number: 15/180,242
- Filed: 2016-06-13
- Published: 2016-12-15
- Granted: 2019-11-19
- Earliest claimed: 2015-06-11
- Assignees: KSR IP Holdings, LLC
- Applicants: KSR IP Holdings, LLC
- Inventors: Eric Hustedt
- Web page: https://patentgrep.com/patent/US10483899B2

## CPC

- H02P 27/085: {wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency}
- H02P 25/22: Multiple windings; Windings for more than three phases
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

An electrical power system for a six-phase electric motor having a first set of three-phase windings and a second set of three-phase windings. A first pulse width modulator operates at a conversion frequency and at a first phase which converts a DC power source to an alternating current to power the motor. The first pulse width modulator is electrically connected to the first set of three-phase windings. Similarly, a second pulse width modulator also operates at the same conversion frequency and at a second phase which converts the DC power to alternating current to power the second set of three-phase windings. The first and second phases of the first and second pulse width modulators are offset between 80-100 degrees.

## Claims

### Claim 1

An electrical power system for a six-phase electric motor comprising:
a first set of three-phase windings,
a second set of three-phase windings,
a first pulse width modulator operating at a conversion frequency and a first phase which converts a DC power source to an alternating current, said first pulse width modulator being electrically connected to said first set of three-phase windings,
a second pulse width modulator operating at said conversion frequency and a second phase which converts said DC power source to an alternating current, said second pulse width modulator being electrically connected to said second set of three-phase windings,
wherein said first and second phases are offset from each other by between 80 and 100 degrees to thereby reduce ripple current in said windings.

### Claim 2 (depends on 1)

The invention as defined in claim 1 wherein said second phase is offset from said first phase by substantially 90 degrees.

### Claim 3 (depends on 1)

The invention as defined in claim 1 wherein said conversion frequency exceeds 10 kilohertz.