RADIAL FLUX PERMANENT MAGNET ELEVATOR MOTOR

Abstract

A radial flux permanent magnet elevator motor includes a motor frame forming the stator frame having fixing points to be fixed to an elevator guide rail, which frame has a back wall facing and/or abutting with the guide rail, which motor frame includes an axially extending flange protruding away from the back wall in the direction of the rotor, and which motor frame includes at least one axially extending first wall section in a defined radial distance from the axis of the motor frame, which first wall section is configured to support a stator winding of the motor. The rotor includes a central hub protruding into the flange of the motor frame and is rotatively supported within the flange via bearings, which rotor includes a traction sheave in a first radial distance from the motor axis and a ring-like support wall in a second radial distance from the motor axis for supporting permanent magnets, which second distance is larger than the first distance, and whereby the stator winding and the permanent magnets form a radial air gap.

Claims

1. A radial permanent magnet elevator motor, comprising: a motor frame forming a stator frame and having fixing points to be fixed to an elevator guide rail, which said motor frame having a back wall facing and/or abutting with the elevator guide rail, said motor frame comprising: an axially extending flange protruding away from the back wall in the direction of a rotor of the motor; and at least one axially extending first wall section in a first radial distance from an axis of the motor frame, the first wall section being configured to support a stator winding of the motor, a central hub protruding into the flange of the motor frame, the central hub being rotatively supported within the flange via bearings; and a traction sheave as well as a ring-like support wall in a second radial distance from the axis of the motor frame for supporting permanent magnets, wherein the second distance is larger than the first distance, and whereby the stator winding and the permanent magnets form a radial air gap.

2. The motor according to claim 1, wherein the motor frame and the rotor each form trough-like cavities having openings facing each other.

3. The motor according to claim 1, wherein the rotor comprises an outer ring like support wall forming a brake surface for at least one elevator brake.

4. The motor according to claim 1, wherein several wall sections are located at the motor frame in an equidistant spacing.

5. The motor according to claim 1, wherein at least one of the permanent magnets is at least partially embedded into the rotor iron of the rotor.

6. The motor according to claim 1, wherein the rotor comprises a first rotor portion surrounding the hub and extending radially and a second rotor portion extending at an angle of 10 to 45 degrees in the direction of the back wall of the motor frame, whereby at the outer circumference of the second rotor portion the traction sheave is located.

7. The motor according to claim 6, wherein the rotor has a third rotor portion extending from the traction sheave radially outwards and away from the back wall of the motor frame, at an angle of 45 to 90 degrees from the radial plane, the third rotor portion having a ring-like support wall on an outer rim thereof.

8. The motor according to claim 3, wherein the support wall forms a brake surface for at least one elevator brake on an outer surface thereof.

9. The motor according to claim 5, wherein at least one of the permanent magnets is at least partially embedded into an inner surface of the ring-like support wall.

10. The motor according to claim 5, wherein the permanent magnets are arranged in uniform or approximately uniform angular intervals around the axis of the motor frame in the inner surface fully circumferential of the ring-like support wall.

11. The motor according to claim 1, wherein the thickness of the motor is 20 to 40% of its diameter.

12. The motor according to claim 1, wherein the back wall has a longitudinal radially extending recess with the width of the guide rail, whereby the recess is arranged to accommodate the guide rail.

13. The motor according to claim 1, wherein the motor frame comprises mounting points for at least one elevator brake.

14. The motor according to claim 1, wherein the flange extends 5 to 20 cm from the back wall.

15. The motor according to claim 1, wherein the motor frame faces the rotor only from one side facing the guide rail.

16. The motor according to claim 1, wherein the rotor is made from light weight metal.

17. The motor according to claim 1, wherein the hub is born in the flange with two axially spaced apart bearings.

18. The motor according to claim 1, wherein the diameter of the traction sheave is smaller than the second diameter.

19. An elevator comprising the motor according to claim 1 and having at least one guide rail and a roping running over the traction sheave for supporting and/or moving an elevator car.

20. The elevator according to claim 19, being a machine-room less elevator, wherein the motor is located between one guide rail and a shaft wall.

21. The elevator according to claim 19, wherein the motor is mounted to the guide rail with a mounting flange which on one hand is fastened to the guide rail and on the other hand is fixed to the flange of the motor frame.

22. The elevator according to claim 21, wherein the mounting flange, the flange, the traction sheave and the stator winding and the permanent magnets are located in a common vertical plane.

Description

[0029] The invention is now described by means of an embodiment in connection with the enclosed drawings.

[0030] FIG. 1 shows a side view from the elevator guide rail,

[0031] FIG. 2 shows a top view of FIG. 1,

[0032] FIG. 3 shows a partly sectioned top view of the motor of FIG. 1,

[0033] FIG. 4 shows a side view of the motor of FIG. 1, and

[0034] FIG. 5 shows a vertical section through the center of the motor of FIG. 1.

[0035] FIG. 1 shows an elevator motor 10 comprising a motor frame 12 which is fixed via balls 14 to a guide rail 18 of an elevator.

[0036] The motor frame 12 comprises a back wall 16 having in its center a ring-like flange 20 for taking up a rotor. Further, the motor frame 12 comprises several spaced apart first wall sections 22 which are configured to support at least one stator winding 24. The motor 10 further comprises a rotor 26 having an axial central hub 28 which is supported on bearings 30a, 30b against the flange 20 of the motor frame 12. The hub 28 is connected to a radially extending first rotor portion 29 which is at its outer circumference connected to a slightly inclined second rotor portion 31. At the outer circumference of the second rotor portion 31 the traction sheave 32 is extending in the direction of the back wall 16. The first rotor portion 29, the second rotor portion 31 as well as the traction sheave 32 may be made of separate parts but preferably are a forming a one piece part preferably made of metal. At the outer edge of the traction sheave 32 opposing the back wall 16, a third rotor portion 33 protrudes axially away from the back wall 16 and radially outwards. This this rotor portion 33 carries at its outside a ring-like support wall 34 which carries at its inner surface 37 the permanent magnets 36 of the elevator motor. The permanent magnets 36 can be embedded into the inner surface 37 of the ring-like support wall 34. Thus, the stator windings 24 and the permanent magnets 36 are forming a radial air gap. The outer surface 38 of the ring-like support wall 34 of the rotor forms a brake surface for two elevator brakes 40a, 40b.

[0037] Thus, the overall construction of the elevator motor is very flat and very compact and integrated so that only a minimal unused space is left inside the closed area between the motor frame 12 and the rotor 26. With respect to the guide rail 18, it has to be mentioned that it is preferably a T-shaped guide rail with the central vertical member 41 of the guide rail 18 extends in axial direction and where the horizontal member 42 of the guide rail 18 extends in radial direction. The horizontal member 42 of the guide rail 18 has a width w which fits to the width of a recess 44 in the back wall 16 of the motor frame 12. This recess 44 extends radially and goes through the axis of the motor 10. When the motor 10 is fixed to the guide rail 18, the horizontal member 42 of the guide rail 18 with the width w is accommodated within the recess 44 so that the thickness of the back wall 16 does not add up to the thickness of the horizontal member 42 of the guide rail 18 as now the horizontal member 42 of the guide rail 18 is now located within the wall thickness of the back wall 16. Thus, a reduced thickness of the mounted construction of guide rail and elevator motor is obtained.

[0038] In FIG. 3, it can clearly be seen that the horizontal member 42 of the T-profile guide rail 18 is within the thickness area of the back wall 16 which reduces the thickness of the complete construction.

[0039] FIG. 5 further shows a mounting flange 46 mounted to the guide rail 18 with bolts 14 whereby the mounting flange 46 surrounds and supports the flange 20 of the motor frame 12 preferably via a resilient support material or noise insulating elements 48 which also provides a noise isolation of the elevator motor 10 with respect to the guide rail 18. This reduces the noise in the elevator shaft and thus improves the traveling comfort for the passengers. Furthermore, an upper and a lower mounting shoe 50, 52 is mounted to the guide rail 18 which mounting shoes 50, 52 form-fit with corresponding mounting protrusions 54 located at the upper and lower end of the motor frame 12. Thus, the elevator motor 10 is kept in place on the guide rail 18 and is on the other hand noise-isolated with respect to the guide rail.

[0040] The above-mentioned embodiment shall not be restricting for the scope of protection of the invention as it is apparent from the appended patent claims.

LIST OF REFERENCE NUMBERS

[0041] 10 radial flux permanent magnet elevator motor [0042] 12 motor framestator frame [0043] 14 fastening bolts [0044] 16 back wall of the motor frame [0045] 18 guide rail [0046] 20 flange of the motor frame [0047] 22 first wall section of the motor frame [0048] 24 stator winding(s) [0049] 26 rotor [0050] 28 central hub of the rotor [0051] 29 first rotor portion [0052] 30a,b bearings between stator flange and rotor hub [0053] 31 second rotor portion [0054] 32 traction sheave [0055] 33 third rotor portion [0056] 34 ring-like support wall of the rotor [0057] 35 mounting points of the motor frame for the brakes [0058] 36 permanent magnets [0059] 37 inner surface of the ring-like support wall [0060] 38 outer surface of the ring-like support wall [0061] 40a,b elevator brakes [0062] 41 horizontal member of T-profile guide rail [0063] 42 vertical center member of T-profile guide rail [0064] 44 recess in the back wall for accommodating the guide rail [0065] 46 mounting flange mounted to the guide rail for supporting the motor on the guide rail [0066] 48 resilient support material between the mounting flange and the flange of the motor framenoise insulating elements [0067] 50 upper mounting shoe [0068] 52 lower mounting shoe [0069] 54 mounting protrusion