Rotor including segmented yoke
Rotor for motor or generator, which rotor ( 11 ) includes a rotor ring ( 12 ), which rotor includes a yoke formed by yoke segments ( 13 ) which by arrangement to the rotor ring ( 12 ) forms a complete yoke. The yoke segments ( 13 ) are provided with one or more magnet blanks ( 19 ), which magnet blanks ( 19 ) are formed by one or more permanent magnets ( 18 ).
1. A rotor ( 11 ) for a motor or generator, comprising a rotor ring ( 12 ) defining a central axis A and having a radially inner portion and a radially outer portion, a yoke formed by a plurality of separate yoke segments ( 13 ) arranged adjacent to one another to the outer portion of the rotor ring ( 12 ) to form a complete yoke, the yoke segments ( 13 ) including a substantially planar base ( 20 ) having ends defining opposite side surfaces ( 21 a , 21 b ) extending from the base ( 20 ) to an upper surface ( 22 ), each of the opposite side surfaces extending upwards and slightly inclined outwards from the base ( 20 ) in the direction towards an upper surface ( 22 ), the upper surface thereby having a longer extension than the base ( 20 ), wherein
the upper surface comprises a planar central section ( 22 a ) that is substantially parallel to the base ( 20 ) between opposite inclined sections ( 22 b , 22 c ) and each of the respective inclined sections ( 22 b , 22 c ) is inclined from the central section ( 22 a ) downward in the direction toward the respective side surfaces ( 21 a , 21 b ),
a magnet blank ( 19 ) comprising a plurality of magnets ( 18 ) is mounted on each of the central section ( 22 a ) and opposite inclined sections ( 22 b , 22 c ) with space between each magnet blank ( 19 ) such that there is space between each magnet blank ( 19 ) around the rotor ring ( 12 ), and
the rotor ring ( 12 ) has a width W 1 in the direction of the central axis A and a centrally protruding section ( 15 ) that protrudes radially and has a width W 2 that is less than W 1 , and
the centrally protruding section ( 15 ) extends around the entire circumference of the rotor ring ( 12 ) with the yoke segments ( 13 ) secured to the centrally protruding section ( 15 ).
2. The rotor of claim 1 , wherein the yoke segments ( 13 ) are provided with one or more magnet blanks ( 19 ) formed by one or more permanent magnets ( 18 ).
3. The rotor of claim 2 , wherein the permanent magnets ( 18 ) of the magnet blanks ( 19 ) are glued together or formed by permanent magnets ( 18 ) arranged to a carrier for fastening to the yoke segments ( 13 ).
4. The rotor of claim 2 , wherein the magnet blanks ( 19 ) are arranged to the yoke segments ( 13 ) via gluing or magnetic force.
5. The rotor of claim 2 , wherein the permanent magnets ( 18 ) of the magnet blanks ( 19 ) are provided with corrosion protection in the form of an encapsulation of suitable material.
6. The rotor of claim 5 , wherein the suitable material for encapsulation is selected from the group consisting of stainless steel, composite, elastomer and glass fiber.
7. The rotor of claim 6 , wherein a gasket or sealing means is positioned between the encapsulation and yoke segments ( 13 ) after arrangement of the encapsulation and yoke segments ( 13 ) to completely seal the rotor.
8. The rotor of claim 5 , wherein the encapsulation and the yoke segment ( 13 ) are welded to one another with a gasket or sealing means applied for secure sealing.
9. The rotor of claim 2 , wherein the yoke segment ( 13 ) and magnet blanks ( 19 ) are encapsulated in the same material forming an encapsulated unit ( 50 ).
10. The rotor of claim 1 , wherein the upper surface ( 22 ) has a mainly planar central section ( 22 a ) which extends in parallel to the base ( 20 ), and slightly inclined surfaces ( 22 b - c ) at each side of the central section ( 22 a ) that transition down towards the sides ( 21 a - b ).
11. The rotor of claim 1 , wherein at least one yoke segment ( 13 ) includes at least one guiding pin ( 17 ) configured for cooperative engagement with one or more holes in the rotor ring ( 12 ) for positioning the yoke segments ( 13 ) in relation to the rotor ring ( 12 ) and in relation to the other yoke segments ( 13 ).
12. The rotor of claim 1 , wherein the rotor ring ( 12 ) includes at least one guiding pin ( 17 ) configured for cooperative engagement with one or more holes in a yoke segment ( 13 ) for positioning the yoke segments ( 13 ) in relation to the rotor ring ( 12 ) and in relation to the other yoke segments ( 13 ).
13. The rotor of claim 1 , wherein the rotor ring ( 12 ) and yoke segments ( 13 ) are provided with cooperative first and second fasteners ( 14 , 16 ) for fastening of the yoke segments ( 13 ) to the rotor ring ( 12 ).
14. The rotor of claim 2 , wherein the permanent magnets ( 18 ) are demagnetized or magnetized during the assembly.
15. The rotor of claim 1 , wherein the yoke segments ( 13 ) are secured to the ring via pins ( 17 ) through the yoke segments ( 13 ) positioned outside the width W 2 of the protruding part ( 15 ).
16. The rotor of claim 15 , wherein the pins ( 17 ) do not penetrate the rotor ring ( 12 ) past the radially inner portion.
17. The rotor of claim 1 , wherein the ring ( 12 ) has a circumferential surface that extends transversally, each yoke segment ( 13 ) extends longitudinally in the transverse direction.
18. A rotor for motor or generator, comprising a rotor ring ( 12 ) defining a central axis A and having a radially inner portion and a radially outer portion, a yoke formed by yoke segments ( 13 ) arranged to the radially outer portion of the rotor ring ( 12 ) to form a complete yoke, the yoke segments ( 13 ) including a substantially planar base ( 20 ) having ends defining opposite side surfaces ( 21 a , 21 b ) extending from the base ( 20 ) to an upper surface ( 22 ), each of the opposite side surfaces extending upwards and slightly inclined outwards from the base ( 20 ) in the direction towards the upper surface ( 22 ), the upper surface thereby having a longer extension than the base ( 20 ), wherein
the yoke segments ( 13 ) include one or more magnet blanks ( 19 ) formed by one or more permanent magnets ( 18 ), wherein the magnet blanks ( 19 ) are arranged in an encapsulation with a gasket or sealing means between the encapsulation of the magnet blanks ( 19 ) and yoke segments ( 13 ), or wherein the magnet blanks ( 19 ) are arranged in an encapsulation, a sealing means is applied to the encapsulation of the magnet blanks ( 19 ) and completely seals the rotor,
the upper surface comprises a planar central section ( 22 a ) that is substantially parallel to the base ( 20 ) between opposite inclined sections ( 22 b , 22 c ) and each of the respective inclined sections ( 22 b , 22 c ) is inclined from the central section ( 22 a ) downward in the direction toward the respective side surfaces ( 21 a , 21 b ),
a magnet blank ( 19 ) comprising a plurality of magnets ( 18 ) is mounted on each of the central section ( 22 a ) and opposite inclined sections ( 22 b , 22 c ) with space between each magnet blank ( 19 ) such that there is space between each magnet blank ( 19 ) around the rotor ring ( 12 ), and
the rotor ring ( 12 ) has a width W 1 in the direction of the central axis A and a centrally protruding section ( 15 ) that protrudes radially and has a width W 2 that is less than W 1 , and
the centrally protruding section ( 15 ) extends around the entire circumference of the rotor ring ( 12 ) with the yoke segments ( 13 ) secured to the centrally protruding section ( 15 ).
19. The rotor of claim 18 , wherein the yoke segments ( 13 ) are secured to the ring via pins ( 17 ) through the yoke segments ( 13 ) positioned outside the width of the protruding part ( 15 ).