SI21004A - Improved bearing shield of direct current comutator motor with permanent magnets - Google Patents

Abstract

The subject of invention is the implementation of an improved bearing shield on the commutator's side of a direct-current commutator motor with permanent magnets, which - besides a simple connection of electric voltage to the motor - enables also a reliable guiding of brushes and a simple installation of the remaining necessary elements (capacitor, rectifier circuit board) without any special additional working operations. The improved bearing shield (10) on the commutator's side of the direct-current commutator motor with permanent magnets has a standard connection tab (15), the installation of which - in addition to the basic function of connection of electric voltage to the motor - enables also a function of a suitable electrical connection to a spring (13) of a brush (12) which can be put on a bolt (23) and a pin (16) of the capacitor (14) without any additional working operations. The spring (13) which is pressing the brush (12) to the commutator has been shaped in such a manner that it creates a component of the force in the direction of the arrow (F2), which is pushing the brush (12) against the walls of a guide (25), reducing thus the undesired noise and improving the commutation with the commutator. The very structure of the improved bearing shield enables also a simple upgrade of the direct-current commutator motor with the rectifier circuit board which can be mounted directly on the said bearing shield and does not increase the basic length of the motor itself due to the shield's effective consumption of space.

Description

The subject of the invention is the implementation of an improved bearing shield on the collector side in a direct current collector motor with permanent magnets, which in addition to the easy connection of electrical voltage to the motor also with reliable brush management and easy installation of other necessary elements (capacitor, rectifier circuit) without special additional operations. The invention belongs to the class H 02K 5/26 of the international patent classification.

A technical problem that the present invention successfully solves is the construction 20 and the implementation of such a bearing shield on the brushes side of a permanent collector motor with permanent magnets, which will allow to reduce the number of components and to reduce and simplify the technological operations related to the connection of the supply voltage to the motor and further electrical connection to the spring and capacitor to eliminate radio frequency interference; the design should allow the supply voltage to be connected via standard couplings and to maximize space utilization and compact engine design, keeping the brushes guided in such a way that contact with the motor manifold is as stable as possible.

The structural design according to the invention should also allow for the attachment of a directional electronic circuit with damping elements directly to the basic version of the motor, without extending the basic length of the motor itself.

Known designs of bearing shields, especially of the brush shield side bearings for DC motors, are designed to allow the pair of brushes to be guided and the springs that press the brushes to the manifold be properly positioned, while also solving the problem of connecting the electrical voltage to the motor.

For simpler designs, the brushes are mounted without special guides and their position is provided only by the position and force of the pressure springs. Such a solution does not allow for reliable brush guidance, as well as for easy connection of the electrical voltage to the motor. It is not possible to install and connect other necessary elements in such a way that such construction is only suitable for low-cost electric motors.

Better solutions have a brush shield on the side of the brushes designed so that the years have adequate guides that allow you to guide the brushes and the appropriate springs to install the spring. All electrical connections, including the electrical connections of the brushes, are designed so that they must be made by soldering, which necessitates additional work operations.

The subject of the invention is an improved collector side bearing shield for a direct current permanent magnet collector motor, in which a standard connecting tab, in addition to the basic function of connecting the electrical voltage to the motor, also enables the function of a suitable electrical connection with a brush spring and a capacitor and is a spring shape which is protruding and pushing the brush onto the manifold such that it also creates a force component that pushes the brush against the guide walls, thereby reducing unwanted noise and improving commutation with the manifold. a directional circuit which can be directly attached to said bearing shield and does not extend the basic length of the motor itself due to space utilization.

The invention will be explained in more detail on the basis of an embodiment and figures, of which:

Figure 1 is a permanent magnet collector motor with an enhanced bearing shield on the collector side according to the invention in side view in partial longitudinal section and side shield view on the collector side;

Figure 2 is an axonometric view of a part of a collector motor with an improved bearing shield on the collector side of the invention;

3 is a detail of the attachment of the connecting tab 15 to the bearing shield of the invention;

Figure 4 shows a detail of a guide 11 with a brush insert 12 and an illustration of the action of forces on the insert brush 12 due to the operation of the spring arm 24;

5 shows a spring 13 in front, rear and rear axle views;

Fig. 6 is a direct current permanent magnet collector motor with an io mounted enhanced bearing shield on the collector side of the invention with a rectifier circuit installed.

The present invention relates to a DC motor with permanent magnets. The collector motor is illustrated in Figure 1 and consists essentially of a housing 1 in which permanent magnets 2 and a rotor 3 are attached. The rotor consists of a shaft 4, rotor blades 5 with copper winding 6 and a collector 7. Bearings 8 are used for proper rotor mounting. which are mounted in the bearing shield 9 and the bearing shield 10. The bearing shield 9 lies on the drive side of the engine, while the bearing shield 10 lies on the side of the manifold 7. On the side of the manifold 7 there is a bearing

The 2o shield 10 is made of thermoplastic and also includes guides 11 brushes 12. The function of the brushes 12 is to transfer direct current to the collector 7 and through it to the rotor copper winding 6. The supply of electricity to the brushes 12 is enabled via a spring 13. Due to legal regulations on In order to eliminate interference between the supply voltage and the motor housing 1, a suitable capacitor 14 must also be connected to electromagnetic compatibility.

On the collector side 7, a connecting tab 15 is mechanically secured in the bearing shield 10, which is shown in detail in Figure 3. In addition to the basic function of connecting the supply voltage to the motor, the tab 15 also functions as an electrical connection with a spring 13 of the brush 12 and an electrical connection with the capacitor. 14. From the technical and economical point of view, the triple function of the standard connecting tab 15 is very advantageous as it does not require additional connecting elements and associated mounting procedures, but standard plugs for connecting the supply voltage can be attached to it.

The bearing shield 10 according to the invention is designed in such a way as to enable its proper attachment of the standard connecting tab 15 in such a way that all three of the above functions are enabled. The tab 15 has a connecting rod 17. The connecting tab 15 is secured to the bearing shield 10 by the legs of the connecting tab 17, which are pushed through the holes 18 in the bearing shield 10 and then mechanically overlapped on the underside to achieve sufficient mechanical strength of the joint. In addition to the connecting tab 15, a leg 16 of the capacitor 14 is inserted into the hole 18, whereby a properly selected hole size 18 enables a suitable electrical connection between the connecting tab 15 and the capacitor 14.

The bearing shield 10 has a groove 20 in the carrier 19 in which the straight arm 21 of the spring 13 is fixed, which is movably mounted on the outgrowth 23. The groove 20 protects the spring 13 against failure in use, and in combination with the position of the outgrowth 23, at the same time allows a suitable straight position arms 21 of spring 13 to obtain adequate electrical contact between the connecting tab 15 and the brush 12 via the spring 13.

The bearing shield 10 also includes a seat 22 which enables and provides the condenser 14 to be properly positioned, thus preventing the incorrect installation or subsequent displacement of the condenser 14, thereby eliminating the possibility of insufficient electrical distances between the supply voltage and the motor housing 1.

In the outgrowth 23, a spring 13, which presses on the brush 12, is arranged in such a way that, in addition to the basic force component in the direction of arrow F1, which presses the brush 12 on the manifold 7, the brush 12 also creates a transverse or lateral force component in the lateral component of the force in the direction of the arrow F2 is at least 10% and in this case is achieved by moving the working arm 24 of the spring 13 from the normal position for an angle A of at least 5 °. angle A is shown in Fig. 5. The brush 12, due to the transverse or lateral component of the force in the direction of arrow F2, also presses the wall of the guide 25 of the brush 12. This pressure reduces the vibrations of the brush 12 in the guide 11, and consequently reduces the level of unwanted noise or noise. , and better commutation of brush 12 with manifold 7.

The connecting tab 15, the condenser 14 and the spring 13 are on the outside of the motor, which makes it easier to install the brushes 12, since the spring 13 can only be mounted on the overhang 23 only in the last stage of assembly. The design allows the use of 2.8, 4.8, or 6.3 mm wide tabs, which are installed in such places that they do not extend the entire length of the motor.

Upgrading the basic engine may also include a rectifier circuit 26, which is mounted face-down on the motor housing 1 on the manifold side and centered on the bearing shield 10 as shown in Figure 6. The rectifier circuit 26 is directly and connected to its electrical terminals 27. motor 15, which also provides the necessary mechanical and electrical connection between the rectifier circuit 26 and the motor. This coupling method makes it possible to upgrade the engine easily and economically, and due to the good space utilization of the motor, the circuit elements 28 can be turned inwards towards the engine and therefore do not extend the basic length of the motor. If larger elements are required on the rectifier circuit, they must be facing outwards, extending the motor by up to 20 mm.

Claims (7)

PATENT APPLICATIONS 1. Improved manifold side bearing shield for DC permanent magnet motor 5, characterized in that the integrated brushes guides (11), the outgrowth of the outgrowth (23) and the mechanical attachment of the connecting tab (15) allow electrical connection between the leg (16) of the condenser (14) and the brush (12) io via the spring (13) and the electrical connection of the motor without additional work operations after installation, with the connecting tab (15), the capacitor (14) and the spring (13) (12) mounted on the outside of the engine. is 2. Improved manifold side bearing shield for DC permanent magnet collector motor according to claim 1, characterized in that the seat (22) provided in the bearing shield (10) provides a precisely defined position and position of the capacitor (14). 3. Improved manifold side bearing shield for one-way permanent magnet collector motor according to claims 1 and 2, characterized in that a groove (20) is provided along the guide (11) of the brush (12) into which a spring (25) is mounted (13) the straight arm (21) of the spring (13) and the connecting tab (15) rests on the overgrowth (23), while the working arm (24) of the spring (13) rests on the brush (12). 4. Improved manifold side shield for one-way permanent magnet 5 collector motor according to claims 1 to 3, characterized in that the working arm (24) and the straight arm (21) of the spring (13) are spaced apart by the angle (A ) and with their shape and in combination with their installation, in addition to the basic function of pressing the brush (12) on the collector io (7), they also create a significantly transverse or lateral force component. 5. Improved manifold side bearing shield for a permanent magnet permanent magnet motor according to claim 4, characterized in that the lateral force component in the direction of the arrow (F2) is at least 10% of the basic force component in the direction of the arrow (F1). 6. Improved manifold side shield for one-way permanent magnet collector motor according to claim 4, 20, characterized in that the angle (A) between the straight arm (21) and the working arm (24) of the spring (13) is at least 5 °. -1010 7. Improved manifold side shield for one-way permanent magnet manifold motors according to claims 1 to 6, characterized in that the frontal shield and (10) centered earthing circuit 5 (26) are connected via their electrical connections ( 27) directly connected to the connecting tabs (15).