# US 2014/0196277 A1 · Rotor Having a Squirrel Cage

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- Number: US 2014/0196277 A1
- Document ID: US20140196277A1
- Status: Published application
- Kind: A1
- Application number: 14/211,316
- Filed: 2014-03-14
- Published: 2014-07-17
- Earliest claimed: 2009-12-22
- Assignees: KSB Aktiengesellschaft
- Applicants: KSB Aktiengesellschaft
- Inventors: Gerhard HUTH; Sven URSCHEL; Ralf FISCHER
- Web page: https://patentgrep.com/patent/US20140196277A1

## CPC

- H02K 15/03: having permanent magnets
- H02K 1/278: Surface mounted magnets; Inset magnets
- H02K 17/20: having deep-bar rotors
- H02K 21/46: Motors having additional short-circuited winding for starting as an asynchronous motor
- Y10T 29/49012: Rotor
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A rotor (11) with a squirrel cage and permanent magnets (19) mounted on and distributed around the circumference of the rotor, including a core stack extending over the entire rotor region with longitudinally continuous rotor slots extending over the length of the core stack. The squirrel cage is constructed with cage bars disposed, and preferably cast, in the rotor slots; short circuit rings connect the cage bars at both end faces of the core; and the radius of the rotor region is reduced by at least the radial thickness of the magnets. The radius of rotor (11) is reduced over the entire length between short circuit rings (17) such that the radial height of cage bars (15, 29) or cage webs (27) connected thereto is reduced. Also an electric motor or a radial pump having such a rotor, and methods of producing or operating such devices.

## Claims

### Claim 1

A method for producing a rotor having a squirrel cage and permanent magnets distributed around the circumference, said rotor having a laminated core which extends over the entire rotor region and is provided with longitudinally continuous rotor slots, wherein the squirrel cage passes through the rotor slots over the entire length of the laminated core and is formed with cage bars which are disposed in the rotor slots and with short-circuiting rings which connect the cage bars on both end faces of the laminated core, comprising the acts of:
reducing a radius of the rotor including a radial height of the cage bars or cage webs which are connected to the cage bars over the entire length of the rotor between the short-circuiting rings by at least the radial thickness of the permanent magnets; and
mounting the permanent magnets on the rotor in a region of the rotor having the reduced radius.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the permanent magnets are adhesively bonded in a clearance or groove produced by reducing the radius of the rotor.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the permanent magnets are magnetized before being fitted to the rotor.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the permanent magnets are magnetized with a magnetizing yoke after being fitted to the rotor.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein a binding or a non-magnetic sleeve for securing the permanent magnets to the rotor is mounted on the permanent magnets.

### Claim 6 (depends on 5)

The method as claimed in claim 5, further comprising the act of:
reducing a radius of the short-circuiting rings,
wherein the binding or non-magnetic sleeve is fixed in place by the short-circuiting rings.