# US 2017/0288577 A1 · Device and method for switching in and out a start winding of a single phase ac motor

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- Number: US 2017/0288577 A1
- Document ID: US20170288577A1
- Status: Published application
- Kind: A1
- Application number: 15/477,241
- Filed: 2017-04-03
- Published: 2017-10-05
- Earliest claimed: 2016-04-05
- Assignees: Flint & Walling, Inc.
- Applicants: Flint & Walling, Inc.
- Inventors: Eric J. Hansen; Adam J. Cohen; Josh E. Tang
- Web page: https://patentgrep.com/patent/US20170288577A1

## CPC

- H02P 1/42: for starting an individual single-phase induction motor {(H02P27/04 takes precedence)}
- H02P 25/04: Single phase motors, e.g. capacitor motors
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A device for switching in and out a start winding of a single phase AC motor using an energizer winding to generate voltage which can be used to power a simple timing switch circuit. The AC voltage is rectified and converted to DC voltage. The DC voltage is then used to drive a normally closed solid state switch to an open state which in turn inactivates a triac connected to the start winding in the motor. The “on time” of the start winding is controlled by a RC circuit that ramps the voltage to the gate of a FET that drives current through the normally closed solid state switch.

## Claims

### Claim 1

A single phase AC motor containing a start winding circuit comprising
a rotor, and
a stator, wherein the stator is wound with a main winding, a starting winding, and an energizer winding,
wherein the energizer winding is connected to an AC-DC convertor to generate DC voltage to power a timing switch circuit to activate and inactivate the starting winding of the motor.

### Claim 2

A start winding cut-out circuit for a single phase AC electric motor including a stator, a main winding and a start winding, said main winding being adapted to be connected across AC power supply lines, said circuit comprising an electronic switch having a pair of power terminals and a gate which closes said switch in response to triggering voltage appearing thereon, said power terminals and said start winding being connected in series and connected across said main winding, timing means operating through a timing interval during current flow therethrough, said timing means being connected to said gate and forming a source of trigger current to said gate, and an auxiliary coil wound on said stator and adapted to have voltage induced therein, said auxiliary coil being connected to provide said voltage as a timing means to provide said trigger current for said time interval after initial energization of said motor.

### Claim 3 (depends on 2)

The circuit as in claim 2, wherein said coil is wound on the axis of said start winding.

### Claim 4 (depends on 2)

The circuit as in claim 2, wherein said coil is wound on the axis of said main winding.

### Claim 5 (depends on 2)

The circuit as in claim 2, wherein said coil is wound between said start and main windings.

### Claim 6 (depends on 2)

The circuit as in claim 2, wherein said coil and said trigger means are connected to one side of said start winding.

### Claim 7 (depends on 2)

The circuit as in claim 2, wherein said coil is substantially seventy electrical degrees from the main winding.