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Capacitance type rotary encoder and method for sensing rotation angle

A rotary encoder and capacitive technology, applied in the direction of converting sensor output, using electric/magnetic devices to transmit sensing components, instruments, etc., can solve the problems of large volume and complex structure of capacitive rotary encoders, and achieve small size, The effect of simple structure

Active Publication Date: 2012-11-28
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of capacitive rotary encoder has a complex structure and a large volume.

Method used

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  • Capacitance type rotary encoder and method for sensing rotation angle
  • Capacitance type rotary encoder and method for sensing rotation angle
  • Capacitance type rotary encoder and method for sensing rotation angle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] figure 1 It is a schematic diagram of the static plate of the capacitive rotary encoder in Embodiment 1 of the present invention. It is a transmitter and receiver used as an encoder.

[0076] Such as figure 1 As shown, the same conductive electrodes 101 are arranged on a stationary plate. Every four consecutive electrodes form a space cycle, as shown in the figure, every four electrodes A, B, C, D form a space cycle. The four electrodes in each cycle are respectively excited by four different signals. In this embodiment, there are four wires 104 on the side different from the static board (when the printed circuit board has only one layer) or on a layer of different layers (when the printed circuit board has multiple layers), corresponding to these four different wires 104 respectively. Stimulate electrical signals. The signal generator provides four AC excitations with different phases, which are respectively loaded on the four wires 104 . The phase difference of...

Embodiment 2

[0116] image 3 A schematic diagram of a static plate of a capacitive rotary encoder provided by Embodiment 2 of the present invention.

[0117] Such as image 3 As shown, the emission area is provided with 64 radially arranged electrodes 301 to form a track. The 8 signal lines A0, A1, B0, B1, C0, C1, D0, and D1 are arranged on the other layer of the static board, and are divided into two groups: 1 series (A1, B1, C1, D1) and 0 series (A0, B0, C0, D0). Note that the signal line in the embodiment of the present invention is a ring, but in other embodiments, the signal line can also be in other shapes and forms. Each electrode 301 is connected to a corresponding signal line through a via hole.

[0118] Every four consecutive electrodes A, B, C, and D constitute a space period, which are respectively excited by an orthogonal four-phase (A phase, B phase, C phase, D phase) AC voltage source. The excitation signal of each phase is respectively connected to two signal lines, fo...

Embodiment 3

[0132] Figure 7 A schematic diagram of a static plate of a capacitive rotary encoder provided by Embodiment 3 of the present invention.

[0133] Figure 7 An embodiment of a static plate with higher precision or larger diameter is given. The number of electrodes 701 is 128, but the present invention is not limited to this number. Since the number of detected code bits in absolute mode determines the maximum number of unique positions that can be distinguished in absolute mode. Increasing the accuracy of the encoder or increasing the diameter of the encoder requires more bits. The detected code bits are increased by increasing the number of sector-shaped conductive regions. Specifically, as in the above example, each sector-shaped conductive area can provide a 3-bit effective code, then three sector-shaped conductive areas can provide a 9-bit effective code, that is, 2^9=512 absolute positions can be distinguished. The ring-shaped conductive area 702 on the static plate i...

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Abstract

The invention discloses a capacitance type rotary encoder and a method for sensing a rotation angle. The encoder comprises a dead plate and a movable plate, wherein the dead plate comprises an emitting region, a first receiving region and a second receiving region which are electrically isolated from one another; the emitting region comprises a plurality of electrodes arranged axially; N electrodes are divided into one group; the phases of excitation signals of different electrodes in each group are different, and the phases of excitation signals of the Mth electrode in the electrodes of each group are the same; the movable plate can rotate around a rotating shaft and comprises a first reflecting region and a second reflecting region which are separated by an insulating region; the first reflecting region is located at the periphery of the second reflecting region and is concentric to the second reflecting region; the edges of the first reflecting region and the second reflecting region are respectively provided with a plurality of bulges facing to the opposite sides; and the bulges of the two reflecting regions are arranged in a staggered way; the first reflecting region and the second reflecting region are respectively in capacitive coupling with the first receiving region; and the second reflecting region and the emitting region are respectively in capacitive coupling with the second receiving region.

Description

technical field [0001] The invention relates to capacitive encoder technology, in particular to a capacitive rotary encoder and a method for sensing rotation angles. Background technique [0002] Rotary encoders are widely used in various fields, such as speed and position control systems of motors. Rotary encoders are devices used to measure angles and rotational speeds, including stators and rotors. The rotor is connected with the measured object, and the rotation of the measured object drives the rotor to rotate. The rotary encoder can convert mechanical quantities such as angular displacement and angular velocity of the rotor into electrical signals for output. [0003] Currently, optical rotary encoders are widely used for speed and position feedback. However, optical encoders are not durable enough for motor applications. In harsh environments, such as frequent mechanical shocks, vibrations, or high-temperature environments, the photoelectric code disc in the encod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/241H02K29/06H02K29/14
CPCG01D5/2415
Inventor 林燕凌杨艺榕杜昭辉
Owner SIEMENS AG
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