US 11,923,732 B2
Magnetic rotor unit, and apparatus and method of manufacturing a magnetic rotor unit
David Brown, Hornchurch (GB); Matthew Magee, Hornchurch (GB); Jon Swift, London (GB); Steven Roome, Leigh on Sea (GB); and John Taylor, Radlett (GB)
Assigned to SG Technologies Limited, Rainham (GB)
Appl. No. 17/423,032
Filed by SG Technologies Limited, Rainham (GB)
PCT Filed Jan. 13, 2020, PCT No. PCT/EP2020/050670
§ 371(c)(1), (2) Date Jul. 14, 2021,
PCT Pub. No. WO2020/148223, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 1900491 (GB), filed on Jan. 14, 2019.
Prior Publication US 2022/0123631 A1, Apr. 21, 2022
Int. Cl. B29C 65/32 (2006.01); B29C 65/00 (2006.01); B29C 65/46 (2006.01); H02K 15/03 (2006.01); B29L 31/00 (2006.01)
CPC H02K 15/03 (2013.01) [B29C 65/32 (2013.01); B29C 65/46 (2013.01); B29C 66/7394 (2013.01); B29C 66/742 (2013.01); B29K 2995/0008 (2013.01); B29L 2031/7498 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method of manufacturing a magnetic rotor unit, the method comprising:
providing a composite magnetic rotor body comprising magnetic particles dispersed in a polymer resin and having a hole formed therein;
inserting a shaft into the hole, an outer diameter of the shaft corresponding to an inner diameter of the hole; and,
heating the shaft,
wherein the heating is performed in a relatively cool environment so as to induce a temperature gradient across the rotor body radially outward of the shaft.