US 10,536,062 B2Granted

Induction motor with series connected windings for multi-speed operation

AssigneeRegal Beloit America, Inc.

InventorWilliam Eugene Blatterman

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Abstract

An electric motor includes a main winding coupled to a first line terminal, and first and second boost windings coupled in series to the main winding. A high-speed lead wire is coupled to a first tap between the main winding and the first boost winding, a medium-speed lead wire is coupled to a second tap between the first boost winding and the second boost winding, and a low-speed lead wire is coupled to a third tap after the second boost winding. A start winding has a first end coupled to the first line terminal and a second end. A capacitor has a first end series-coupled to the second end of the start winding and a second end coupled to the second tap. A switch coupled to a second line terminal is configured to couple the second line terminal to one of the high, medium, and low-speed lead wires.

Claims20

Dependent claims

An electric motor comprising:

a main winding coupled to a first line terminal;
a first boost winding coupled in series to said main winding;
a second boost winding coupled in series to said first boost winding;
a high-speed lead wire coupled to a first tap provided between said main winding and said first boost winding;
a medium-speed lead wire coupled to a second tap provided between said first boost winding and said second boost winding;
a low-speed lead wire coupled to a third tap provided after said second boost winding;
a start winding comprising a first end coupled to said first line terminal and a second end;
a switch coupled to a second line terminal and configured to selectively couple said second line terminal to each of said high-speed lead wire, said medium-speed lead wire, and said low-speed lead wire;
and
a capacitor comprising a first end series-coupled to said second end of said start winding and a second end coupled to said second tap, such that said capacitor and said start winding are coupled in parallel with said main winding and in series with said first boost winding when said switch is coupled to said high-speed lead wire, in parallel with said main winding and said first boost winding when said switch is coupled to said medium-speed lead wire or said low-speed lead wire, and not in parallel with said second boost winding when said switch is coupled to said low-speed lead wire.

7 more elements

A method of manufacturing an electric motor comprising:

coupling a main winding to a first line terminal;
coupling a first boost winding in series to the main winding;
coupling a second boost winding in series to the first boost winding;
coupling a high-speed lead wire to a first tap provided between the main winding and the first boost winding;
coupling a medium-speed lead wire to a second tap provided between the first boost winding and the second boost winding;
coupling a low-speed lead wire to a third tap provided after the second boost winding;
providing a start winding having a first end coupled to the first line terminal and a second end;
coupling a switch to a second line terminal, the switch configured to selectively couple the second line terminal to each of the high-speed lead wire, the medium-speed lead wire, and the low-speed lead wire;
and
providing a capacitor having a first end series-coupled to the second end of the start winding and a second end coupled to the second tap, such that said capacitor and said start winding are coupled in parallel with the main winding and in series with the first boost winding when the switch is coupled to the high-speed lead wire, in parallel with the main winding and the first boost winding when the switch is coupled to the medium-speed lead wire or the low-speed lead wire, and not in parallel with the second boost winding when the switch is coupled to the low-speed lead wire.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/887,019Filed 19 Oct 2015
Published: US 2017/0110942 A120 Apr 2017
Granted: 14 Jan 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02K 17/08
For single phase current: motors with auxiliary phase obtained by externally fed auxiliary windings, e.g. capacitor motors
H02K 3/28
Windings characterised by the conductor shape, form or construction, e.g. with bar conductors: layout of windings or of connections between windings
H02K 11/28
For measuring, monitoring, testing, protecting or switching: manual switches
H02K 17/06
For single phase current: having windings arranged for permitting pole-changing