SI26024A - Insulation ring for stators with contact plate for electric motors - Google Patents

Abstract

The subject of the invention is an insulating ring (1) for stators with a contact plate for motors, whereby the entire motor, i.e. the stator with the rotor, is immersed in the medium. The insulating ring (1) is made as a single element essentially in the form of a low cylinder and has an outer circumference (1a) at the bottom with a step (2) for abutting the step (4a) of the front insulation (4) sprayed on the stator , and on the lower part of the inner circumference (1b) it has teeth (3) made at regular intervals for receiving conductors (5). After winding the conductors (5), contacting the conductors (5) with the bus bars (7) and after welding the bus bars (7) and conductors (5), the insulating ring (1) is inserted into the slot (8) between the step (4a) insulation (4) and the front surface (6a) of the contact carrier (6), thus ensuring fully insulated contacts on the contact plate before filling with epoxy resin.

Description

Insulating ring for stators with a contact plate for electric motors

The subject of the invention is an insulating ring for stators with a contact plate for motors, where the entire motor, i.e. the stator with the rotor, is immersed in the medium. Preferably, the mentioned motors are used to drive a hermetically sealed gas pump, for example for air conditioning compressors in the automotive industry. Preferably, the electric motors are EC (electronically commutated) electric motors. The medium can be various refrigerants that are permitted by law to be used for air conditioning compressors in the automotive industry. Since the entire motor is immersed in the medium, it is necessary to ensure that the contacts on the contact plate are immersed and completely insulated. The contact plate consists of a contact carrier and "bus bars", whereby the contact carrier has grooves in which the "bus bars" are placed to make contacts with the conductors.

This is made possible by a special form of insulating ring, which, after winding the conductors, contacting the conductors with the bus bars and after welding the bus bars and the conductors together, is mounted on the contact side of the motor, in the gap between the front insulation of the stator and the contact holder. The insulating ring closes the openings between the conductors and the contact carrier, which are created as a result of the technological processes of manufacturing electric motors.

The technical problem solved by the mentioned invention is to provide sealed and completely insulated contacts on the contact plate on the stator side, where the conductors are connected to the bus bars mounted on the contact carrier. The rest of the stator winding has insulated wire and this is not soldered. Non-insulated contacts, i.e. bus bars and conductor contacts with bus bars, which are made from part of the stripped conductors, i.e. purposely stripped insulation from the conductors to carry out contacting (welding), are filled with a two-component epoxy compound that prevents electrical breakdown between phases, on the housing stator or other conductive parts.

Since the technology of manufacturing stators with a contact plate does not ensure sufficient tightness of non-insulated contacts before pouring with epoxy mass, it is necessary to provide additional conditions for sealing the space around non-insulated contacts with a structural solution.

From the state of the art, the applicant is not aware of solutions for the implementation of electric motors with a contact plate, where the entire motor is immersed in a medium, which would ensure sufficient tightness of non-insulated contacts.

The stated technical problem is solved with a special form of insulating ring, which after winding, contacting the conductors with the bus bars and after welding the bus bars and conductors is inserted into the gap between the frontal insulation of the stator and the contact carrier, and which ensures sufficient tightness of the non-insulated contacts before watering with epoxy mass to yourself.

The invention will be described below and presented in the figures showing:

Figure 1 shows the insulating ring

Figure 2 shows the installation of the insulating ring on the stator, front section

Figure 3 shows the installation of the insulating ring on the stator in a cross section

Figure 4 shows the tooth shape of the insulating ring.

The insulating ring 1 is made as a single element, essentially in the form of a low cylinder, and on its lower part, the outer circumference la is made with a step 2 for abutting on the step 4a of the frontal insulation 4, which is sprayed on the stator, and on the lower part of the inner circumference lb, it has in evenly spaced teeth 3 for receiving conductors 5, whereby the number of teeth 3 is equal to the number of conductors 5.

The width and height of the step 2 is defined in such a way that a tight fit of the insulating ring 1 is enabled on the step 4a of the frontal insulation 4 and on the contact carrier 6.

The height H of the insulating ring 1 is determined so that the insulating ring 1 extends above the level of the bus bars 7 and the level of the conductors 5, so that a sufficient height of the application of the two-component epoxy mass is ensured, with which, after inserting the insulating ring 1 in the gap 8 between step 4a front insulation 4 and the front surface 6a of the contact carrier 6, covers non-insulated contacts and connections. This ensures fully isolated contacts on the contact plate.

Optionally, the insulating ring 1 has an additional step 2a implemented on the upper part of the outer circumference la, when this is necessary due to additional spatial limitations of the electric motor construction.

The tooth 3 is designed as a flat body that protrudes in the radial direction from the inner circumference lb of the insulating ring 1 towards the center, whereby the height L of the tooth 3 is such that the width D of the insulating ring 1 in the part where the insulating ring 1 has in the radial direction teeth 3, at least such that it completely seals the openings 9 between the conductors 5 and the contact carrier 6. Namely, the insulating ring 1 with the step 2 rests on the step 4a of the frontal insulation, with its lower surface it only rests on the surface of the gap 8 between the step 4a of the frontal insulation 4 and the front surface 6a of the contact carrier 6 and thus seals the openings 9 next to the conductors 5.

The side of the tooth 3, which is adapted to receive the conductor 5, as seen from the inner circumference lb of the insulating ring 1 in the radial direction towards the center of the ring 1, is first made with a ramp 3a, which continues into a cut-out 3b.

Optionally, the cut-out 3b can continue into section 3c, when the conductors 5 are slightly removed from the front surface 6a of the contact holder 6, with the aim of the section 3c additionally sealing the opening 9 next to the individual conductor 5 on the front surface 6a and stretching to part of the gap 8 between the front surface 6a of the contact holder 6 and conductors 5.

The inclination a of the ramp 3a is between 30 and 40 degrees and allows the conductors 5 to slide down the ramp 3a to the desired place, i.e. into the cut-out 3b, when the insulating ring 1 is installed.

The dimension of the cut-out 3b is each time adjusted to the dimension of the conductor 5, so that it is possible to fix the conductor 5 in the cut-out 3b. In a preferred embodiment, the cut-out 3b is made as a substantially semicircular cutout, the radius of the semicircular cutout 3b being substantially the same as the radius of the conductor 5.

When making the stator, i.e. after winding the conductors, contacting the conductors 5 with the bus bars 7 and after welding the bus bars 7 and the conductors 5, the insulating ring 1 is inserted into the gap 8 between the front surface 6a of the contact carrier 6 and the step 4a of the frontal insulation 4, which is injected on the stator, so that each tooth 3 is located essentially in the middle of the distance between two adjacent conductors 5. After inserting the insulating ring 1 into the slot 8, the insulating ring 1 is rotated in the direction of the ramp 3a, whereby the conductors 5 slide down the ramp 3a into the recess 3b . The shape of the insulating ring 1 ensures that all the conductors 5 are correctly positioned each in its cut-out 3b and seals the openings 9 next to the conductors 5. Then follows the filling of the gap 8 with the inserted insulating ring 1 with two-component epoxy resin. The height H of the insulating ring 1 also determines the height of the application of the two-component epoxy mass, which is used to cover the uninsulated contacts and connections.

A stator with a contact plate is usually designed in such a way that the contact carrier 6 with its outer circumference rests closely on the inner circumference of the step 4a of the frontal insulation 4. In the event that during the manufacture of the stator there is a defective fit, the construction of the insulating ring also allows for the sealing of any gap thus created .

Claims (8)

Patent claims Insulation ring (1) for stators with contact plate for electric motors, wherein the contact plate is connected to the conductors (5) to the bus bar (7) mounted in grooves made on the contact carrier (6), characterized in that the insulating ring (1) is designed as a single element essentially in the form of a low cylinder and has an outer circumference (1a) made in the lower part with a step (2) for abutting the step (4a) of the front insulation (4) sprayed on the stator , on the lower part of the inner circumference (lb) it has teeth (3) for receiving conductors (5) at regular intervals, whereby the number of teeth (3) is equal to the number of conductors (5). Insulating ring according to Claim 1, characterized in that the tooth (3) is designed as a flat body projecting in a radial direction from the inner circumference (lb) of the insulating ring (1) towards the center, the height (L) of the tooth (3) such that the width (D) of the insulating ring (1) in the part where the insulating ring (1) has teeth in the radial direction (3) is at least such that it completely seals the openings (9) between the conductors (5). ) and contact carriers (6). Insulating ring according to Claims 1 and 2, characterized in that the side of the tooth (3) adapted to receive the conductor (5) is viewed from the inner circumference (lb) of the insulating ring (1) in a radial direction towards the center of the ring. (1), first made with a ramp (3a), which continues into the cutout (3b). Insulation ring according to the preceding claims, characterized in that the slope (a) of the ramp (3a) is between 30 and 40 degrees. Insulation ring according to the preceding claims, characterized in that the dimension of the cut-out (3b) is in each case adapted to the dimension of the conductor (5), in order to allow the conductor (5) to be fixed in the cut-out (3b). Insulation ring according to the preceding claims, characterized in that the cut-out (3b) is designed as a substantially semicircular cut-out, the radius of the semicircular cut-out (3b) being substantially equal to the radius of the conductor (5). Insulating ring according to the preceding claims, characterized in that the width and height of the step (2) are defined so as to allow the insulating ring (1) to fit snugly on the step (4a) of the front insulation (4) and on the contact carrier (6). ). Insulating ring according to the preceding claims, characterized in that the height (H) of the insulating ring (1) is determined so that the insulating ring (1) extends above the level of the bus bars (7) and the level of conductors (5) to ensure sufficient the application height of the two-component epoxy mass, which, after inserting the insulating ring (1) into the gap (8) between the step (4a) of the front insulation (4) and the front surface (6a) of the contact carrier (6), seals uninsulated contacts and connectors.