The present invention relates to an arrangement for mounting the stator in a flat elevator motor having a motor body, a stator fastened to it and a rotor. The physical dimensions of the elevator machine have a relevance to the size of the elevator shaft and/or building, depending on where the machine is placed. When the elevator machine is placed in the elevator shaft or beside it, the thickness of the elevator machine has an essential importance regarding the
space required. US patent specification 5,962,948 discloses an elevator machine designed to be placed in the elevator shaft and having a flat, discoid elevator motor comprising a stator and a rotor. The rotor comprises a rotor disc provided with permanent magnets a traction sheave mounted on it. The stator has a stator core and windings. The stator is fastened between the motor body and the rotor by a
screw fastening technique. The object of the present invention is to achieve a new type of mounting structure for fastening the stator to the body of the motor, by means of which it is
possible to improve the cooling of the stator and to achieve a stator structure that is very compact as compared with priorart solutions.
In the mounting structure of the invention, the stator is fitted inside a trough-like
mounting part, wherein the space between the stator winding and the mounting part is filled with a thermally conducting filler serving to conduct heat from the stator to the mounting part. The characteristic features of the invention are described hereinafter.
The invention makes it possible to achieve an economical, simple and reliable
stator fastening arrangement. In addition, efficient cooling and consequently a
high power density as well is achieved. In the solution of the invention, the insu-
lating gaps can be smaller than in prior-art solutions, allowing the elevator motor
to be made shorter in the axial direction than prior-art motors, which is very im-
portant especially in the case of elevator motors designed to be placed in the el-
evator shaft. In addition, the use of a filler prevents soiling of the stator wind-
ings. Therefore, the protection rating of the motor can be relatively easily raised.
Moreover, the mounting part and the stator form a single unit, which leads to a

Brief Description of the Accompanying Drawing
Figure 1 shows the arrangement for mounting the stator in a flat elevator motor
according to the present invention.
In the following, the invention will be described in detail by the aid of an ex-
ample with reference to the attached drawing, which illustrates the stator mount-
ing arrangement of the invention.
The figure 1 presents a flat, discoid elevator motor 2 used in a gearless elevator
machine placed close to a guide rail 1. It comprises a disc 4 formed in the motor
body 3 and a stator 5 fastened to said disc. The stator comprises a winding core
51 and windings 52. Mounted with bearings 3 on the body 3 are a round rotor
disc 7 and a traction sheave 8. The disc 4 has on its inner side a recess 41
formed for the rotor.
The stator 5 is mounted outside the rotor 7, i.e. on the opposite side of the disc
4 in the trough 91 of a trough-shaped mounting part 9 made of e.g. aluminum.
The mounting part 9 is fastened to the disc 4 with screws 10 at the outer edge.
The mounting part 9 is provided with cooling fins 92 on the outside. The space
11 between the winding 52 and the mounting part 9 is filled with resin 12, which
has a good thermal conductivity. Thus, the winding 52 and especially its ends
are effectively cooled inside the mounting part 9. The resin also binds the stator
fast to the mounting part 9, no other fastening elements being thus needed.
It is obvious to the person skilled in the art that different embodiments of the in-
vention are not limited to the example described above, but that they may be
varied within the scope of the claims presented below.

We claim:
1. Stator fastening arrangement in a flat elevator motor (2) having a motor body (4)
provided With a stator (5) comprising a stator core (51) and a winding (52), and a rotor (7)
fitted in conjunction with the stator, and in that the stator (5) is fitted within a substantially
trough like mounting part (9) fastened to the motor body (4), and that the space between
the mounting part (9), and the stator (5) is filled with a thermally conductive filling material
(12) serving to conduct heat from the stator to the mounting part (9), characterized in that
the stator (5) is fastened to the mounting part (9) by means of the filling material.
2. Stator fastening arrangement as claimed in claim 1, wherein the filling material is a
castable material, preferably resin.
3. Stator fastening arrangement as claimed in claim 1, in an elevator motor having a
discoid body (4) and a rotor (7), wherein the trough-like mounting part (9) is fastened to the
motor body (4) at the outer edge by means of fastening elements (10), the stator being dis-
posed on the opposite side of the motor body (4) relative to the rotor.

4. Stator fastening arrangement as claimed in claim 1, wherein the mounting part (9) is
made of aluminum.
5. Stator fastening arrangement as claimed in claim 1, wherein the mounting part (9) is
provided with cooling fins (92).
6. Stator fastening arrangement as claimed in claim 1, wherein the electric motor is a
discoid elevator motor.