Temperature compensation angle encoder

Abstract

The invention relates to the field of angle encoders, in particular to a temperature compensation angle encoder. On the basis of an original angle encoder, a new dimension concept of the working temperature of temperature compensation is provided for the first time, the heating part and the refrigerating part are automatically triggered according to the working environment temperature measured by the temperature sensor, so that the actual working temperature environment of the original angle encoder is adjusted, the angle encoder can work more accurately, and the working efficiency is improved. The external environment change can be dealt with. On one hand, the encoder can be in a relatively stable working temperature interval when working in an environment with high and low temperature changes, so that reduction of measurement precision caused by temperature changes is avoided, and high-precision measurement of the encoder is ensured; on the other hand, due to the design of the angle encoder, more material selection redundancy can be stored when the angle encoder body is designed; according to the invention, a new solution thought is provided for ensuring high-precision measurement of the angle encoder.

Description

Technical Field

[0001] The present invention relates to the field of angle encoders, in particular to a temperature-compensated angle encoder. Background Art

[0002] An angle encoder is a device that detects an object's rotation as a physical variable through a sensor element and transmits this rotational and angular information to the outside world in the form of an electrical signal. Angle encoders can measure both rotational speed and direction of rotation and are generally used in speed or position control systems. They have a wide range of applications in industry, agriculture, defense, and military, playing a key role in position and speed measurement and control in various fields.

[0003] Existing angle encoders have a certain temperature tolerance range. However, when used in specific scenarios, large temperature differences, frequent high and low temperature fluctuations, and particularly harsh temperatures can significantly affect the encoder's accuracy, preventing accurate measurement tasks and thus hindering the proper operation of the corresponding equipment and systems. For example, aircraft flying at high altitudes or even in space are prone to encountering low-temperature environments. Accurate angle encoders are particularly important for aircraft's angular positioning, steering, and mid-air docking.

[0004] In the industry, the solution to the impact of temperature on angle encoders is often the selection of materials, or the degree to which the accuracy of the prepared materials is affected by temperature changes, and redundancy is calculated in advance. These problem-solving directions will lead to relatively limited materials available for the device and relatively simple means of solving the problem. Summary of the Invention

[0005] In response to the above-mentioned problems or shortcomings, and to solve the problem that the accuracy of existing angle encoders is reduced or even unable to complete measurement tasks when subjected to temperature changes (extreme temperatures, large temperature differences, and environments with frequent high and low temperature changes), the present invention provides a temperature-compensated angle encoder.

[0006] To achieve the above objectives, the present invention adopts the following specific technical solutions:

[0007] A temperature-compensated angle encoder comprises an angle encoder body and a temperature control module.

[0008] The angle encoder body realizes angle measurement and outputs measurement signals to the outside through cables.

[0009] The temperature control module includes a heating part, a cooling part, a temperature sensor and a control part.

[0010] The heating part and the cooling part are attached to the back of the angle encoder body; the temperature sensor is used to measure the working environment temperature of the angle encoder body.

[0011] The control unit controls whether the heating unit and the cooling unit are working according to whether the measurement result of the temperature sensor meets the preset operating temperature of the angle encoder body (the temperature range for high-precision operation); if the measurement result exceeds the preset operating temperature, the cooling unit is controlled to work to lower the current operating temperature of the angle encoder body; if the measurement result is lower than the preset operating temperature, the heating unit is controlled to work to increase the current operating temperature of the angle encoder body.

[0012] Furthermore, the angle encoder body is an absolute encoder, an incremental encoder or a Hall encoder.

[0013] Furthermore, the heating part and the cooling part are distributed on the back of the angle encoder body in the following manner: the cooling part is arranged in the middle area of ​​the back of the angle encoder body; the heating part is arranged in the two side areas of the back of the angle encoder body.

[0014] Furthermore, the refrigeration unit is also equipped with a temperature averaging plate, which makes the refrigeration unit cool the angle encoder body more evenly and efficiently.

[0015] Furthermore, the heating part is implemented by metal resistance wire to improve heating efficiency, uniformity and integration.

[0016] Furthermore, the refrigeration unit is implemented by providing microchannels on the supporting back plate of the angle encoder body to improve the refrigeration efficiency, uniformity and integration.

[0017] Furthermore, the coolant of the microchannel is an insulating coolant to prevent the coolant from overflowing and conducting electricity when the microchannel is damaged.

[0018] Furthermore, the heating part is a polyimide heating plate.

[0019] Furthermore, the refrigeration unit adopts semiconductor refrigeration plates.

[0020] Furthermore, the control unit is implemented using a circuit structure to facilitate device miniaturization.

[0021] In summary, the present invention proposes the concept of temperature compensation for the first time in the new dimension of operating temperature, in order to improve the operating temperature environment of the device, so that it can work more accurately in this dimension and cope with changes in the external environment. On the one hand, it can ensure that the encoder is in a relatively stable operating temperature range when operating in an environment with high and low temperatures, avoiding the reduction in measurement accuracy caused by temperature changes and ensuring high-precision measurement of the encoder. On the other hand, the design of the present invention allows for more material selection redundancy when designing the angle encoder body. The present invention provides a new solution for ensuring high-precision measurement of the angle encoder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the embodiment;

[0023] Figure 2 This is a structural diagram of the functional control device of the embodiment;

[0024] Figure markings: 1. Encoder housing, 2. Function control device, 3. Heating plate, 4. Refrigeration plate, 5 Temperature equalizer, 6. Encoder cover, 7. Outlet connector seat, 8. Outlet connector, 9. Encoder cable, 2.1 Photoelectric control module, 2.2 Temperature control function module, 2.3 Fixed seat. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] The temperature controllable angle encoder of this embodiment includes an angle encoder body and a temperature control module. Figure 1 shown.

[0027] The angle encoder body includes: an encoder housing 1, a function control device 2, an encoder cover 6, an outlet connector seat 7, an outlet connector 8 and an encoder cable 9.

[0028] The temperature control module includes two polyimide heating plates 3 (heating part), a semiconductor cooling plate 4 (cooling part), a temperature equalizing plate 5, a temperature sensor and a temperature control function module 2.2 (control part).

[0029] In this embodiment, considering a certain degree of device integration and miniaturization, a photoelectric control module (for angle measurement), a temperature sensor (not shown in the figure), and a temperature control function module (control unit) are integrated on a fixed base to form the entire functional control device. Figure 2 This is a schematic diagram of the structure of the function control device in an embodiment. A positioning structure is provided on the fixing base, and a positioning surface is provided within the encoder housing to cooperate with the positioning structure, thereby stably fixing the function control device to the imaging plane. The photoelectric control module 2.1 is also equipped with a function indicator light for fault detection.

[0030] The function control device is fixedly installed in the encoder housing, two polyimide heating plates are respectively bonded to the two sides of the back of the function control device, and the semiconductor refrigeration plate is bonded to the middle area of ​​the back of the function control device; both sides of the temperature equalizing plate are coated with thermal grease and fixed to the encoder cover; the encoder cover is also equipped with heat dissipation fins, which are covered on the slots of the encoder housing. After covering, the temperature equalizing plate and the refrigeration plate form good contact.

[0031] The encoder cover is also equipped with air holes for balancing air pressure. The encoder cover and the encoder housing have an interference fit, which is secured with glue after connection. The outlet connector is equipped with welding terminals for the welding cable. The cable of the function control device is welded to the outlet connector. The outlet connector is fixedly connected to the encoder housing. The outlet connector and the encoder cable are welded together and fixed to the outlet connector.

[0032] Whether the heating plate and the cooling plate in this embodiment are working is determined by the temperature control function module (control unit) 2.2 according to the measurement results of the integrated temperature sensor.

[0033] In specific use, since all the parameters of the angle encoder body have been determined, its preset operating temperature (temperature range for high-precision operation) has also been determined; we set the threshold conditions for whether the heating plate and the cooling plate are working by the temperature control function module:

[0034] If the temperature sensor's measurement exceeds the preset operating temperature, the cooling unit is activated to lower the angle encoder's current operating temperature. If the temperature sensor's measurement is lower than the preset operating temperature, the heating unit is activated to raise the angle encoder's current operating temperature. By alternating between the heating and cooling units, the angle encoder consistently operates within its corresponding high-precision operating temperature range.

[0035] Taking into account the temperature control efficiency and capacity of the heating plate and the cooling plate, the specific heating part and the cooling part can also be changed according to the actual application scenario of the angle encoder body.

[0036] Furthermore, the threshold conditions for whether the heating unit and the cooling unit are working are provided with advance amounts, specifically:

[0037] For the heating part, the measurement result of the temperature sensor continues to drop and reaches X% of the preset lower limit of the operating temperature, which triggers it to work in advance.

[0038] For the refrigeration unit, the measurement result of the temperature sensor continues to rise and reaches Y% of the preset operating temperature upper limit, triggering it to work in advance.

[0039] Furthermore, the X% is determined according to the heating efficiency of the heating unit used, so as to avoid the angle encoder body from operating at a non-preset operating temperature as much as possible through the early triggering mechanism, so as to cope with high-precision application scenarios with high temperature sensitivity.

[0040] Furthermore, the Y% is determined according to the cooling efficiency of the refrigeration unit used, so as to avoid the angle encoder body from operating at a non-preset operating temperature as much as possible through an early triggering mechanism, so as to cope with high-precision application scenarios with high temperature sensitivity.

[0041] It can be seen from the above embodiments that the present invention, based on the original angle encoder, has for the first time proposed a new dimension concept of temperature-compensated working temperature. By automatically triggering the heating part and the cooling part according to the working environment temperature measured by the temperature sensor, the actual working temperature environment of the original angle encoder is adjusted, so that it can work more accurately and respond to changes in the external environment. It also further provides the concept of pre-operation, so that the angle encoder can be suitable for high-temperature sensitivity and high-precision application scenarios. On the one hand, it can achieve a relatively stable working temperature range when the encoder is working in an environment with high and low temperature fluctuations, avoiding the reduction of measurement accuracy due to temperature changes and ensuring the high-precision measurement of the encoder; on the other hand, the design of the present invention can allow more material selection redundancy when designing the angle encoder body; the present invention provides a new solution to ensure the high-precision measurement of the angle encoder.

Claims

1. A temperature-compensated angle encoder, comprising an angle encoder body, characterized in that: Also included is a temperature control module; The angle encoder body realizes angle measurement and outputs the measurement signal to the outside through the cable; The temperature control module includes a heating part, a cooling part, a temperature sensor and a control part; The heating part and the cooling part are attached to the back of the angle encoder body; the temperature sensor is used to measure the working environment temperature of the angle encoder body; The control unit controls whether the heating unit and the cooling unit are working according to whether the measurement result of the temperature sensor meets the preset working temperature of the angle encoder body; if the measurement result exceeds the preset working temperature, the cooling unit is controlled to work to lower the current working temperature of the angle encoder body; if the measurement result is lower than the preset working temperature, the heating unit is controlled to work to increase the current working temperature of the angle encoder body.

2. The temperature-compensated angle encoder according to claim 1, wherein: The angle encoder body is an absolute encoder, an incremental encoder or a Hall encoder.

3. The temperature-compensated angle encoder according to claim 1, wherein: The heating part and the cooling part are distributed on the back of the angle encoder body as follows: the cooling part is arranged in the middle area of ​​the back of the angle encoder body; the heating part is arranged in the two side areas of the back of the angle encoder body; the cooling part is also equipped with a temperature equalizing plate, and the heating part uses a metal resistance wire.

4. The temperature-compensated angle encoder according to claim 1, wherein: The refrigeration unit is realized by arranging a micro-channel on the supporting back plate of the angle encoder body.

5. The temperature-compensated angle encoder according to claim 4, wherein: The cooling liquid of the microchannel is insulating cooling liquid.

6. The temperature-compensated angle encoder according to claim 1, wherein: The control unit is implemented using a circuit structure.

7. The temperature-compensated angle encoder according to claim 1, wherein: The threshold conditions for whether the heating unit and the cooling unit are working are set in advance, specifically: For the heating part, if the measurement result of the temperature sensor continues to drop and reaches X% of the preset lower limit of the operating temperature, it will be triggered to work in advance; For the refrigeration unit, the measurement result of the temperature sensor continues to rise and reaches Y% of the preset operating temperature upper limit, triggering it to work in advance.

8. The temperature-compensated angle encoder according to claim 7, wherein: The X% is determined according to the temperature raising efficiency of the heating unit used.

9. The temperature-compensated angle encoder according to claim 7, wherein: The Y% is determined according to the cooling efficiency of the refrigeration unit used.

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