Positioning motors by means of capacitive measuring
A technology of electric motor and measurement arrangement, which is applied in the direction of measuring device, linear/angular velocity measurement, velocity/acceleration/impact measurement, etc., and can solve problems such as complex methods
Pending Publication Date: 2020-07-07
WEBASTO AG
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Problems solved by technology
The disadvantage of this measurement method is that the method is relatively complex, especially with regard to the required processing of the required measurement signals and the computing power of the evaluation electronics
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[0043] In the following description of the present invention, the same reference numerals are used for elements having the same and same functions.
[0044] Figure 1A with 1B A measurement arrangement 100 for determining the rotational position, speed and / or rotational direction of the rotatable shaft 10 in the first and second rotational positions according to the present invention is shown. The first electrode 20 and the second electrode 30 respectively forming the capacitor element are arranged in the electrode plane PE in a symmetrical manner with respect to the central plane PM (perpendicular to the electrode plane PE or the drawing plane in the drawing). The electrodes 20, 30 form a capacitor element which is flat at the ends and is here formed of an electrically conductive, in particular metallic material, for example copper, in the form of a plate with a rectangular basic shape. The shaft axis 12 of the shaft 10 is perpendicular to the electrode plane PE and extends in th...
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The invention relates to a measuring assembly (100) for determining the rotational position, rotational speed and / or direction of rotation of a shaft (10), in particular of an electric motor of a device of a vehicle that can be adjusted using an electric motor, and a corresponding method. The measuring assembly (100) comprises: at least one first electrode (20) and at least one second electrode (30), each forming capacitor elements, wherein an electrical voltage can be applied at the electrodes (20, 30) in such a way that the electrodes (20, 30) generate an electric field (EF); a rotatable shaft (10), in particular a motor shaft, having a measuring section (11) with an out-of-roundness, wherein the measuring section (11) is arranged relative to the electrodes (20, 30) in such a way that arotation of the shaft (10) brings about a change in the electric field (EF); and an evaluation unit (40) which is conductively connected to an electrode (20, 30), and which is designed to capacitivelydetect a change in the electric field (EF), in particular in the form of a change in a voltage applied at an electrode (20, 30).
Description
Technical field [0001] The present invention relates to a shaft for determining the shaft, especially the shaft of the electric motor of a vehicle's electric adjustable device (such as a sliding roof, window regulator, exterior mirror, seat, convertible roof or locking mechanism) The arrangement and method of measuring the rotation position, speed and / or direction of rotation. Background technique [0002] A number of electric motors are installed in modern vehicles, such as for driving pumps or fans and for actuating electric adjustable devices of the vehicle, such as window lifters, exterior mirrors or seats. In order to control the vehicle device, a number of sensors for automatically acquiring the position and speed of the rotational movement of the corresponding drive motor are installed in the vehicle today. A non-contact sensor for acquiring the rotational position and rotational speed of the drive or output shaft of a motor is known from the prior art. [0003] Generally,...
Claims
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IPC IPC(8): G01D5/24
CPCG01D5/24G01P3/483G01P13/04
Inventor E·埃里希J·霍万
Owner WEBASTO AG