# US 10,122,307 B2 · Doubly stator-fed synchronous generator

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,122,307 B2
- Document ID: US10122307B2
- Status: Granted
- Kind: B2
- Application number: 14/932,183
- Filed: 2015-11-04
- Published: 2017-05-04
- Granted: 2018-11-06
- Earliest claimed: 2015-11-04
- Assignees: Hamilton Sundstrand Corporation
- Applicants: Hamilton Sundstrand Corporation
- Inventors: Jacek F. Gieras
- Web page: https://patentgrep.com/patent/US10122307B2

## CPC

- H02P 9/007: {Control circuits for doubly fed generators}
- H02K 1/246: {Variable reluctance rotors}
- H02K 19/20: with variable-reluctance soft-iron rotors without winding
- H02K 3/20: for auxiliary purposes, e.g. damping or commutating
- H02K 19/14: having additional short-circuited windings for starting as asynchronous motors
- H02K 19/24: with variable-reluctance soft-iron rotors without winding
- H02P 9/302: {Brushless excitation}
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

According to an aspect of the disclosure herein, a generator is provided herein. The generator includes a rotor that further includes a plurality of slots. The generator also includes a three-phase winding configured to produce a first magnetic field and an excitation winding. The excitation winding is a material filling in the plurality of slots and produces a second magnetic field. In turn, a rotation of the generator induces alternating voltage in the stator three-phase winding and the stator excitation winding excites the magnetic flux in the rotor.

## Claims

### Claim 1

A brushless synchronous machine comprising a doubly-fed alternating current generator and an excitation system, the doubly-fed alternating current generator comprising:
a rotor comprising a plurality of slots and a ferromagnetic core, plurality of slots being filled in by a material comprising aluminum or an alloy to form a plurality of magnetic flux barriers to provide no rotor excitation losses by dissipating power losses to a stator;
a three-phase winding configured to produce a first magnetic field; and
an excitation winding comprising a same material as the material filling in the plurality of slots and configured to produce a second magnetic field,
wherein a rotation of the generator induces alternating voltage in the three-phase winding, and
wherein the excitation winding excites a magnetic flux in the rotor,
wherein the generator is coupled to the excitation system,
wherein the excitation system comprises a controlled rectifier, a current control, and a microcontroller, the current control being configured to adjust a direct current field excitation current based on a control signal from the microcontroller to produce an output current to the excitation winding, the microcontroller being configured to monitor a real time voltage and a current of the three-phase winding and the excitation winding and provide a control signal to the current control based on the monitoring, the control signal cause the current control to adjust the direct current field excitation current so the excitation system provides a stable current to the excitation winding during excitation, and the controlled rectifier being configured to convert alternating current power from a three-phase grid to a direct current field excitation current that is fed to the current control.

### Claim 2 (depends on 1)

The doubly-fed alternating current generator of claim 1, further comprising a prime mover of the generator drives the rotor.