DE20120932U1 - Motor-sensor system - Google Patents

Description

PWB-Ruhlatec Industrieprodukte GmbH 21 December 2001

Siegburger Straße 39 MW/gro (2002779)

53757 St. Augustin. Q01613DE20

Engine sensor system

Description

The invention relates to motor sensor systems, consisting of an electric motor (1) with an encoder-side shaft end (2), a fastening device for the motor, connections for the power supply and a circuit board with electronic components for the control and regulation of an encoder unit.

Encoder systems have to meet high requirements in terms of reliability under fluctuating temperature conditions, positioning accuracy and resolution quality. Since these are mass-produced parts, designs suitable for production are required that use as few components as possible, are as simple and trouble-free as possible.

These requirements are met in an excellent manner by a new motor sensor system, which is assembled from two prefabricated components using a new fastening device.

The two components consist of an electric motor with an encoder-side shaft end and a circuit board equipped with electronic components. The motor component contains precisely

measured bore connections for contact pins are molded in. The contact pins are in turn attached to the circuit board in a precise position. When the contact pins are pushed into the bore connections of the motor, the motor/circuit board assembly is initially positioned in the x-y plane of the components.

A sensor emitter unit is also arranged on the circuit board in such a way that when the contact pins are pushed in, it is precisely positioned in relation to the encoder-side shaft end onto which a timing disk will later be placed. An angled fastening clamp can then be pushed over the motor from above in the z-plane and its ends inserted into appropriately prepared slots in the circuit board connected from below. Due to the special shape of the clamp (three-sided positive locking), both the front side and one long side of the electric motor can be used as a guide surface. The force-fitting connection between the roof surface (top side) of the motor and the base surface (bottom side) is made via mechanical and/or thermal processing/deformation between the pin ends and the slots in the circuit board. A radial recess on the front side of the fastening clamp improves positioning accuracy and enables centering in the front plane (x,y,z plane).

The invention is explained in more detail below using an exemplary embodiment. Shown are:

Figure 1 shows the engine sensor system according to the invention before
assembly

Figure 2 Motor sensor system according to the invention in side view
after assembly

Figure 3 Front view of the motor sensor system according to the invention

Figure 4 perspective view of the motor sensor system according to the invention

In Figure 1, motor 1 is shown with the encoder-side shaft end 2 as a cylindrical component with a flattened top and bottom side 1a, 1b. On the flattened side 1b, two bore connections 3, 4 are introduced into the motor housing for the connection to the circuit board 5.

In addition to the two contact pins 6, 7 for insertion into the bore connections 3, 4, the circuit board 5 also includes electronic components such as resistor 8, sensor emitter unit 9 and connector 10. Other components such as the conductor tracks are arranged on the non-visible back of the circuit board.

After the contact pins and the bore connections have been fitted together, the clamp-like fastening device 11 is inserted from above - i.e. from the side of the motor 1a opposite the circuit board 5 - in the direction of the arrow onto the motor 1 and joined with the pin ends 12, 13, 14 in correspondingly designed guide slots 15, 16, 17 on the circuit board 5. The actual strength of the connection is achieved by mechanically twisting or bending the pin ends 12, 13, 14 or thermally by soldering, which can be achieved in one operation.

A semi-circular cutout 18 ensures self-centering positioning of the sensor emitter unit 9 in relation to the shaft end 2. A cylindrical flange 19 on the shaft serves as a stop surface for precise insertion.

end 2. A side surface 20 of the electric motor 1 is provided as a further stop surface, which is encompassed by an angled end 21 of the clamp-like fastening 11.

Figures 2, 3 and 4 show the motor sensor system according to the invention in the assembled state from three different perspectives. In Figure 2, the motor 1 with the clamp-like fastening device 11 is shown in a side view, with a gear side 22 with shaft and pinion 23, 24 for mechanical connection to other control units of the encoder system also being indicated.

On the underside of the motor 1 there is the circuit board 5 with the sensor emitter unit 9 as well as a foot end of the contact pin 7 and the pin ends 12, 14 of the holding device 11. Furthermore, a timing disk 25 'with timing disk hub 26 is shown in side view.

The timing disk and the timing disk hub 25, 26 can also be seen in the front view of the motor 1 according to Figure 3. In addition, the front side of the holding device 11 with the front pin ends 12, 13 and - somewhat hidden - the rear pin end 14 is shown.

The above statements reveal a space-saving and thus particularly weight-reduced design of the holding device 11. This allows additional labeling surfaces 27 to be used on the top of the motor 1. From the perspective view according to Figure 4 it can be seen that the motor sensor system according to the invention is composed of three components, namely the motor 1, the holding device 11 and the circuit board 5, with production only taking place in one preferred direction, which is indicated in Figure 1 with the arrows 28, 29.

All guide surfaces are self-centering, so that no additional auxiliary equipment is required for completion. There is also no need for readjustment, as the prefabricated components were individually visually inspected beforehand.

Claims (5)

1. Motor sensor system, consisting of an electric motor ( 1 ) with an encoder-side shaft end ( 2 ), a fastening device for the motor, connections for the power supply and a circuit board with electronic components for the control and regulation of an encoder unit, characterized in that
that at least two contact pins ( 6 , 7 ) for the energy supply of the motor and for the formation of contact guides with correspondingly shaped bore connections ( 3 , 4 ) are positioned on a stable circuit board ( 5 ) in the motor,
that the electric motor ( 1 ) is surrounded by an angular fastening clamp ( 11 ) at the encoder-side shaft end ( 2 ), the clamp ends being designed as pins ( 12 , 13 , 14 ) which anchor the motor on the front side and at least on one long side in the circuit board ( 5 )
and that the angle-shaped fastening clamp has a stop surface for the encoder-side shaft end of the electric motor in the plane of the motor front face. 2. Motor sensor system according to claim 1, characterized in that the electric motor ( 1 ) has at least one flattened base surface for the connection to the circuit board ( 5 ) and the angle-shaped fastening clamp is connected to the circuit board by gripping around the motor. 3. Motor sensor system according to one of the preceding claims, characterized in that the angle-shaped fastening clamp ( 11 ) together with the circuit board ( 5 ) represents an open housing which surrounds the electric motor ( 1 ) on at least four sides. 4. Motor sensor system according to one of the preceding claims, characterized in that the 4 sides of the open housing are formed by an end face which rests on the encoder-side shaft end ( 2 ) of the electric motor ( 1 ), and three interconnected stop surfaces for the upper, lower and side surfaces of the electric motor ( 1 ). 5. Motor sensor system according to one of the preceding claims, characterized in that the stop surface of the angle-shaped fastening clamp on the front side is designed as a circle or circle segment surface.