EP0193929A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for making a servomotor
Assignee: Kollmorgen Corp
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Filing: 1986-03-04
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Granted: —
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Expires: 2006-03-04
Abstract
Abstract The invention relates to permanent magnet rotor brushless high performance servo motors and to the design and manufacture of such motors making efficient use of high energy product magnets having an energy product in excess of 20 MGOe. The interpole distance to the radial air gap is greater than 1.3 and the ratio of permanent magnet length to air gap length is in the range of from 0.5 to 2.0. The winding is arranged in the air gap and secured to the inner surface of the slotless back iron cylindrical stator shell by encapsulation in a resin having a flexural strength of at least 140 kg/em" at 250°C and high thermal conductivity and a coefficient of thermal expansion in the range of the other materials of the stator structure. The stator winding is formed on a cylindrical temporary support with reduced diameter on one side using preformed coils. The end turns at the end of the temporary support with reduced diameter flare inwardly, whereas the end turns at the other end flare outwardly. The support with the winding is inserted into the stator shell starting with the inwardly flared end turns and is withdrawn from the side of the stator shell with the outwardly flared end turns. The motor of the invention, compared to a servo motor of approximately the same physical dimensions, produces an increase of about 70% in continuous performance and with respect to intermit- tant performance an increase of 80% with only 30% increase of the permanent magnet material.
Inventors
- 👤 Roy D. Schultz
- 👤 Thomas R. England
- 👤 Clark C. Altizer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 06:04
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K15/00; H02K15/06; H02K15/061; H02K1/00; H02K1/02; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; H02K3/00; H02K3/46; H02K3/47; H02K2213/00; H02K2213/03; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
102 words
A dynamoelectric machine comprising a permanent magnet rotor, a cylindrical outer stator shell of magnetic material defining, an air gap between said magnets and said stator shell, and a winding located in said air gap and affixed to said shell, characterized in that the permanent magnets of said permanent magnet rotor have an energy product in excess of 26 MGOe and that said winding is secured to the inside surface of said stator shell by means of an encapsulating resin having a flexural strength in excess of 140 kg/cm l at 250°C, and having a thermal conductivity in excess of 6 (cal)(cm)/(sec)(cm')(°C).
Claim 2
Dependent Claim
102 words
A dynamoelectric machine comprising a permanent magnet rotor, a cylindrical outer stator shell of magnetic material defining, an air gap between said magnets and said stator shell, and a winding located in said air gap and affixed to said shell, characterized in that the permanent magnets of said permanent magnet rotor have an energy product in excess of 26 MGOe and that said winding is secured to the inside surface of said stator shell by means of an encapsulating resin having a flexural strength in excess of 140 kg/cm l at 250°C, and having a thermal conductivity in excess of 6 (cal)(cm)/(sec)(cm')(°C).
Claim 3
Dependent Claim
12 words
The dynamoelectric machine of claim 1 wherein said resin encapsulates said winding.
Claim 4
Dependent Claim
28 words
The dynamoelectric machine of claim 2 wherein the motor further includes a thermally conductive housing and wherein said resin encapsulating said winding is thermally coupled to said housing.
Claim 5
Dependent Claim
22 words
4 . The dynamoelectric machine of claim 2 wherein said resin has a viscosity below 50 000 cps in the uncured state.
Claim 6
Dependent Claim
20 words
The dynamoelectric machine of claim 1 wherein said resin is a ceramic filled epoxy and preferably is non-magnetic and non-conductive.
Claim 7
Dependent Claim
17 words
The dynamoelectric machine of claim 1 wherein said winding consists of a plurality of lapped flat coils.
Claim 8
Dependent Claim
19 words
The dynamoelectric machine of claim 1 wherein said permanent magnets have an energy product in excess of 30 MGOe.
Claim 9
Dependent Claim
17 words
The dynamoelectric machine of claim 7 wherein said permanent magnets are made from neodymium, iron and boron.
Claim 10
Dependent Claim
38 words
The dynamoelectric machine of claim 1 wherein said resin has a thermal expansion coefficient equal to or greater than that of surrounding stator materials, and preferably in the range of 23 to 30 x 1 0- 6 /°C.
Claim 11
Dependent Claim
82 words
1 0. A dynamoelectric machine comprising a rotor including a plurality of radially extending permanent magnets each having an energy product in excess of 26 MGOe; a cylindrical outer stator shell of magnetic material defining an air gap between said magnets and said stator shell; the ratio of the interpolar spacing between adjacent pole faces and the air gap length being at least 1.3; and a multiphase winding in said air gap secured to the inner surface of said cylindrical stator shell.
Claim 12
Dependent Claim
82 words
1 0. A dynamoelectric machine comprising a rotor including a plurality of radially extending permanent magnets each having an energy product in excess of 26 MGOe; a cylindrical outer stator shell of magnetic material defining an air gap between said magnets and said stator shell; the ratio of the interpolar spacing between adjacent pole faces and the air gap length being at least 1.3; and a multiphase winding in said air gap secured to the inner surface of said cylindrical stator shell.
Claim 13
Dependent Claim
22 words
The dynamoelectric machine of claim 10 wherein said winding is encapsulated and secured by epoxy resin, preferably a ceramic filled epoxy resin.
Claim 14
Dependent Claim
42 words
The dynamoelectric machine of claims 1 to 11 wherein the ratio of the length of said permanent magnets to the radial lenth of said air gap is in the range of from 0.5 to 2.0 and the winding is a multiphase winding.
Claim 15
Independent Claim
103 words
A method for making a dynamoelectric machine with the stator winding inside a cylindrical stator shell of magnetic material comprising the steps of creating a generally cylindrical support with a reduced diameter portion at one end; forming the winding around said support from preformed coils such that the coil end turns at the reduced diameter portion of said support flare inwardly, and the coil end turns at the other end of said support flare outwardly; inserting said winding into said cylindrical stator shell starting with said inwardly flared end coils; and removing said supprt from said end of said outwardly flared end coils.
Claim 16
Independent Claim
103 words
A method for making a dynamoelectric machine with the stator winding inside a cylindrical stator shell of magnetic material comprising the steps of creating a generally cylindrical support with a reduced diameter portion at one end; forming the winding around said support from preformed coils such that the coil end turns at the reduced diameter portion of said support flare inwardly, and the coil end turns at the other end of said support flare outwardly; inserting said winding into said cylindrical stator shell starting with said inwardly flared end coils; and removing said supprt from said end of said outwardly flared end coils.
Claim 17
Dependent Claim
17 words
The method of claim 13 wherein said winding is impregnated with resin prior to removing said support.
Claim 18
Dependent Claim
26 words
The method of claim 14 wherein said resin has a flexural strength in excess of 140 kg/cm', and preferably in excess of 280 kg/cm' at 250°C.
Claim 19
Dependent Claim
19 words
The method of claim 14 wherein said resin has a thermal conductivity in excess of 6 (cal)(cm)/(sec)(cm 2 )(°C).
Claim 20
Dependent Claim
25 words
The method of claim 14 wherein said resin has a coefficient of thermal expansion equal to or greater than that of the cylindrical stator shell.
Claim 21
Dependent Claim
22 words
1 8. The method of claim 1 4 wherein said resin has a viscosity below 50 000 cps in the uncured state.
Claim 22
Dependent Claim
18 words
The method of claim 14 wherein said resin is an epoxy filled with a non-conductive and non-magnetic ceramic.
References Cited (Backward Citations)
No citation records indexed.
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