Multi-turn absolute encoder

Abstract

The utility model discloses a multi-turn absolute encoder, and relates to the technical field of encoders. The multi-turn absolute type encoder comprises a code disc, a code reading part, an encoder circuit and an induction circuit, the code disc is arranged on an internal rotating shaft part of the multi-turn absolute type encoder, and the internal rotating shaft part is in transmission connection with a rotating shaft to be detected so as to synchronously rotate; the code reading part is arranged opposite to the code disc, and the encoder circuit is electrically connected with the code reading part; the induction circuit comprises a permanent magnet and an induction coil, and the induction coil is connected with the encoder circuit; the permanent magnet is fixedly connected with the coded disc, and the induction coil and the permanent magnet are fixedly arranged oppositely; the to-be-tested piece can drive the code disc to rotate relative to the code reading part so that the permanent magnet can move relative to the induction coil, and the code reading part is used for obtaining the number of rotation turns and the single-turn rotation angle of the code disc. The multi-turn absolute encoder can still stably and continuously identify the number of rotation turns and the rotation direction after the encoder is powered off, so that the measurement reliability is improved, and the miniaturization of the device is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to encoder technical field, specifically, relate to a kind of multi-turn absolute encoder. BACKGROUND

[0002] Multi-turn absolute encoder is widely applied in industrial automation, precision instrument measurement and other fields, it can accurately measure and record the rotation number of the measured piece, and the absolute angle is obtained by multiplying the number of turns by 360 °, which provides key data for equipment position feedback.

[0003] In order to realize that the encoder can still identify the absolute value of the rotation number after power failure, so as to directly obtain the multi-turn absolute angle when starting. The existing solution usually has the following two kinds: one is battery power supply, and the encoder enters low-power mode when power failure, and measures the absolute angle in a circle after waking up regularly. If the wake-up interval time is T (s), the maximum rotation speed is W (° / s), W*T<180° must be met, so as to ensure that the rotation angle during sleep is less than half a circle, avoid losing the rotation direction and realize the zero point multi-turn splicing. However, this scheme increases the cost, and the battery life is limited, which needs to be replaced regularly, affecting the stable operation of the equipment. The other is to use mechanical parts to store the maximum number of turns. But this way makes the encoder heavy, not suitable for scenes with high volume and weight requirements, and the maximum number of turns is limited, which is difficult to meet the large number of measurement requirements. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of multi-turn absolute encoder, which can still stably and continuously identify the absolute value of the rotation number after the encoder power failure, improve the measurement reliability, and ensure the miniaturization of the device.

[0005] The embodiment of the utility model is realized as follows:

[0006] In one aspect of the utility model, a kind of multi-turn absolute encoder is provided, including code disc, read code part, encoder circuit and induction circuit, code disc is set on the internal rotating shaft component of multi-turn absolute encoder, internal rotating shaft component is transmission connection with the measured rotating shaft to rotate synchronously;Read code part is oppositely arranged with code disc, and the encoder circuit is electrically connected with read code part;Induction circuit includes permanent magnet and induction coil, and induction coil is connected with the encoder circuit;Permanent magnet is fixedly connected with code disc, and induction coil is oppositely fixedly arranged with permanent magnet;The measured rotating shaft can drive code disc to rotate relative to read code part, so that permanent magnet moves relative to induction coil, and read code part is used to obtain the rotation number and single-turn rotation angle of code disc.

[0007] Optionally, the inductive circuit further comprises a rectifier circuit, the rectifier circuit being connected with the inductive coil and the encoder circuit respectively, and the alternating current generated by the movement of the permanent magnet relative to the inductive coil being able to be transmitted to the encoder circuit through the rectifier circuit.

[0008] Optionally, the multi-turn absolute encoder further comprises a power supply battery, the power supply battery being connected with the encoder circuit.

[0009] Optionally, the multi-turn absolute encoder further comprises an energy storage capacitor, the energy storage capacitor being connected with the encoder circuit.

[0010] Optionally, the number of the permanent magnets comprises at least one, and when the number of the permanent magnets is a plurality, the plurality of permanent magnets are arranged at intervals.

[0011] Optionally, the reading part comprises a light source and a photoelectric detector, the code disc is alternately provided with a plurality of light-transmitting regions and a plurality of light-blocking regions in the circumferential direction; the light emitted by the light source is able to pass through the light-transmitting regions and the light-blocking regions, and the light passing through the light-transmitting regions is received by the photoelectric detector and converted into an electric signal.

[0012] Optionally, the number of the light sources comprises at least one, and when the number of the light sources is a plurality, the plurality of light sources are arranged at intervals in the rotation direction of the code disc.

[0013] Optionally, the light source and the photoelectric detector are oppositely arranged, and the code disc is arranged at intervals between the light source and the photoelectric detector, the light emitted by the light source being received by the photoelectric detector after being transmitted through the light-transmitting regions.

[0014] Optionally, the light source and the photoelectric detector are arranged at intervals, and are both located on the side of the code disc away from the shaft to be measured, the light emitted by the light source being received by the photoelectric detector after being reflected by the light-transmitting regions.

[0015] Optionally, the multi-turn absolute encoder further comprises a signal processing circuit, the signal processing circuit being connected with the reading part, and the electric signal converted by the photoelectric detector being able to be amplified, filtered and shaped through the signal processing circuit.

[0016] The beneficial effects of the utility model include:

[0017] The application provides a multi-turn absolute encoder, which comprises a code disc, a code reading part, an encoder circuit and a sensing circuit. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 Fig. 1 is a structural schematic diagram of a multi-turn absolute encoder according to an embodiment of the present application;

[0020] Figure 2 Fig. 2 is another structural schematic diagram of a multi-turn absolute encoder according to an embodiment of the present application;

[0021] Figure 3 Fig. 3 is an assembly schematic diagram of a code disc and a permanent magnet according to an embodiment of the present application;

[0022] Figure 4 Fig. 4 is a structural schematic diagram of a multi-turn absolute encoder according to another embodiment of the present application.

[0023] Fig. 1 is a structural schematic diagram of a multi-turn absolute encoder according to an embodiment of the present application; Fig. 2 is another structural schematic diagram of a multi-turn absolute encoder according to an embodiment of the present application; Fig. 3 is an assembly schematic diagram of a code disc and a permanent magnet according to an embodiment of the present application; and Fig. 4 is a structural schematic diagram of a multi-turn absolute encoder according to another embodiment of the present application. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Please refer toFigure 1 and Figure 2 This embodiment provides a multi-turn absolute encoder 100, including a code disk 110, a code reader 120, an encoder circuit, and a sensing circuit. The code disk 110 is disposed on an internal rotating shaft component of the multi-turn absolute encoder 100, and the internal rotating shaft component is drivenly connected to the shaft under test for synchronous rotation. The code reader 120 is disposed opposite to the code disk 110, and the encoder circuit is electrically connected to the code reader 120. The sensing circuit includes a permanent magnet 131 and an induction coil 132, and the induction coil 132 is connected to the encoder circuit. The permanent magnet 131 is fixedly connected to the code disk 110, and the induction coil 132 is fixedly disposed opposite to the permanent magnet 131. The shaft under test can drive the code disk 110 to rotate relative to the code reader 120, so that the permanent magnet 131 moves relative to the induction coil 132. The code reader 120 is used to obtain the number of rotations of the code disk 110 and the rotation angle per rotation.

[0031] Specifically, such as Figure 1 and Figure 2 As shown, the multi-turn absolute encoder 100 mainly consists of four key parts: a code disk 110, a code reader 120, an encoder circuit, and a sensing circuit. The code disk 110 is mounted on an internal rotating shaft component of the multi-turn absolute encoder 100. This internal rotating shaft component is connected to the shaft under test for synchronous rotation. The shaft under test can be any mechanical component that requires measurement of rotation angle and number of turns, such as a motor shaft or a robotic arm joint. The code disk 110 serves as an information carrier, carrying unique encoded information. This encoded information is read by the code reader 120 during rotation to measure the rotation angle and number of turns.

[0032] The code reader 120 is positioned opposite the code disk 110 to ensure effective reading of information from the code disk 110. Through this relative position, the code reader 120 acquires information from the code disk 110, including the number of rotations and the rotation angle per rotation. The number of rotations reflects the rotation of the shaft under test across multiple complete circles, while the rotation angle per rotation indicates the specific angular position within a complete circle. Combining these two information allows for precise determination of the overall rotational position of the shaft under test.

[0033] The encoder circuit is electrically connected to the code reader 120, thereby providing power to the multi-turn absolute encoder 100. The induction coil 132 is connected to the encoder circuit, wherein the induction circuit consists of a permanent magnet 131 and an induction coil 132, so that the current generated by the induction coil 132 can be transmitted to the encoder circuit, providing the encoder circuit with the required power.

[0034] The permanent magnet 131 and the induction coil 132 are arranged in a relative rotational configuration, as described in one specific embodiment of this application. Figure 1As shown, the permanent magnet 131 is fixedly connected to the code disk 110, and the induction coil 132 is fixedly arranged relative to the permanent magnet 131. In this case, the permanent magnet 131 rotates with the rotation of the code disk 110. Since the permanent magnet 131 has a stable magnetic field, when the permanent magnet 131 moves relative to the induction coil 132, it will cause the induction coil 132 to be in a constantly changing magnetic field environment.

[0035] For the induction circuit, as long as the permanent magnet 131 moves relative to the induction coil 132, according to the principle of electromagnetic induction, the induction coil 132 will cut the magnetic field generated by the permanent magnet 131. This cutting motion of the magnetic field will generate an induced electromotive force, which in turn generates an induced current or induced voltage, thereby powering the encoder circuit and ensuring that the encoder can still stably and continuously identify the number of rotations and the direction of rotation after power failure.

[0036] As for the code reading unit 120, due to the rotation of the code disk 110, the encoded information on the code disk 110 changes continuously during the rotation process, which enables the code reading unit 120 to accurately sense this change and convert it into an electrical signal, thereby obtaining the number of rotations and the rotation angle of the code disk 110 per rotation.

[0037] It should be noted that, in one possible embodiment of this application, firstly, the sensing circuit further includes a rectifier circuit, which is connected to the induction coil 132 and the encoder circuit respectively. The alternating current generated by the movement of the permanent magnet 131 relative to the induction coil 132 can be transmitted to the encoder circuit through the rectifier circuit.

[0038] Specifically, a rectifier circuit is a circuit used to change the direction characteristics of current. It is a component that converts the alternating current generated by the induction coil 132 into direct current that can be effectively utilized by the encoder circuit.

[0039] The induction coil 132 serves as the element generating induced electromotive force. When the permanent magnet 131 moves relative to the induction coil 132, according to the principle of electromagnetic induction, the induction coil 132 cuts the magnetic field of the permanent magnet 131, thereby generating alternating current. Connecting the induction coil 132 to a rectifier circuit allows the alternating current generated by the induction coil 132 to be smoothly input into the rectifier circuit, providing an input source for subsequent current conversion. Furthermore, the rectifier circuit is connected to the encoder circuit. This connection ensures that the rectified current can be delivered to the encoder circuit, providing the necessary power for the normal operation of the encoder circuit, thus guaranteeing the efficient and stable operation of the encoder system.

[0040] Second, in some cases, the code disk 110 rotates at a slower speed, so the induction coil 132 generates very little power, which may not be enough to make the encoder work once. In order to ensure that the induction coil 132 can continue to supply power to the encoder circuit, the multi-turn absolute encoder 100 also includes a power supply battery, which is connected to the encoder circuit.

[0041] Specifically, to ensure stable encoder operation even when the code disk 110 rotates at a slow speed and the induction coil 132 generates insufficient power, the induction coil 132 can still continuously supply power to the encoder circuit. This multi-turn absolute encoder 100 is also equipped with a power supply battery. This battery is specifically designed to provide necessary electrical power to the encoder circuit when the induction coil 132's power supply is insufficient.

[0042] For each relative rotation of the permanent magnet 131 and the induction coil 132, the angle of the absolute code track needs to be measured at least twice to determine the current rotation number and direction of rotation. The induction coil 132 has limited power supply capacity at extremely low speeds, so additional energy storage devices, such as batteries, are required to supplement its power. However, because of the low speed, the reader's operating frequency can be significantly reduced, thereby decreasing the capacity requirements of the energy storage devices.

[0043] The power supply battery and encoder circuit are connected via a specific circuit connection method, such as using wires. Preferably, a suitable control circuit can also be included in the connection line between the power supply battery and encoder circuit, such as a diode to prevent backflow and a voltage regulator to ensure stable output voltage. This connection method allows the power supply battery to be connected to the circuit in a timely manner when the electrical energy generated by the induction coil 132 is insufficient to meet the needs of the encoder circuit, providing a stable power supply to the encoder circuit, thereby ensuring that the encoder can work continuously and accurately, and avoiding measurement errors or equipment failures caused by insufficient power supply.

[0044] Third, similarly, in order to ensure that the induction coil 132 can continue to power the encoder circuit even when the code disk 110 rotates slowly and the induction coil 132 generates insufficient power, in addition to setting up a power supply battery, the multi-turn absolute encoder 100 also includes an energy storage capacitor, which is connected to the encoder circuit.

[0045] Specifically, while ensuring that the induction coil 132 continuously supplies power to the encoder circuit, this multi-turn absolute encoder 100 innovatively incorporates an energy storage capacitor in addition to using a battery. An energy storage capacitor is an electronic component capable of storing electrical energy. When the induction coil 132 generates sufficient power, a portion of the energy is supplied to the encoder circuit for immediate use, while another portion charges the energy storage capacitor, allowing it to store energy. When the code disk 110's rotational speed decreases and the induction coil 132's power generation is insufficient to meet the encoder circuit's needs, the energy storage capacitor can quickly release its previously stored energy, seamlessly connecting to the circuit to power the encoder circuit. This ensures that the encoder operates stably and continuously under various speed conditions, effectively preventing measurement errors or equipment malfunctions caused by unstable power supply.

[0046] If the multi-turn absolute encoder 100 is equipped with a power supply battery, the code reader 120 can wake up only once in a long period of time. Since the power supply battery can provide the power required by the multi-turn absolute encoder 100, the code reader 120 will not lose the absolute count during encoder power failure. Therefore, when the code disk 110 rotates at a sufficiently high speed, the induction coil 132 is mainly powered; when the speed is very low, the power supply battery or capacitor is mainly used, allowing for ultra-low power consumption operation. Thus, by using both in combination, the induction coil 132 can greatly extend battery life or reduce the capacity of the power supply battery or energy storage capacitor, thereby reducing costs and improving measurement efficiency and reliability.

[0047] The aforementioned multi-turn absolute encoder 100 ensures that the encoder can still stably and continuously identify the absolute value of the number of rotations after power failure, thereby improving measurement reliability and ensuring the miniaturization of the device.

[0048] For example, such as Figure 3 As shown, the number of permanent magnets 131 includes at least one, and when the number of permanent magnets 131 is multiple, the multiple permanent magnets 131 are evenly distributed at intervals.

[0049] Specifically, such as Figure 3 As shown, the three permanent magnets 131 are evenly distributed, thus ensuring the diversity and stability of the magnetic field distribution. Compared to a single permanent magnet 131, multiple permanent magnets 131 can form a more complex and uniform magnetic field environment, which is beneficial to improving the induction effect of the induction coil 132 in different positions and rotational states. The magnetic fields of multiple permanent magnets 131 superimpose and interact with each other, making the spatial distribution of the magnetic field more complex, which can provide the induction coil 132 with richer magnetic field information, thereby enhancing the induction effect.

[0050] When the induction coil 132 and the permanent magnet 131 rotate relative to each other, the induction coil 132 passes through the magnetic field of the permanent magnet 131 three times for each revolution, generating an AC voltage waveform. This induced voltage can be used for power supply and also serves as a synchronization signal to transmit the signal required to complete a detection cycle to the encoder. Simultaneously, when the encoder is fully rotated, the induction coil 132 will be attracted to one of the permanent magnets 131, thus achieving a certain locking effect.

[0051] Optionally, such as Figure 1 and Figure 2 As shown, the code reading unit 120 includes a light source 121 and a photodetector 122. The code disk 110 is arranged with multiple light-transmitting areas 111 and multiple opaque areas 112 alternately along the circumferential direction. The light emitted by the light source 121 can pass through the light-transmitting areas 111 and the opaque areas 112 in sequence. The light passing through the light-transmitting areas 111 is received by the photodetector 122 and converted into an electrical signal.

[0052] Specifically, the light source 121 is an important component of the code reading unit 120, and can be a light-emitting diode or other light source 121 device capable of stable light emission. The photodetector 122 can convert the received light signal into an electrical signal and is placed at a position corresponding to the light source 121 in order to effectively receive the light reflected or transmitted from the code disk 110.

[0053] like Figure 1 and Figure 2 As shown, the code disk 110 has light-transmitting areas 111 and opaque areas 112. Multiple light-transmitting areas 111 and multiple opaque areas 112 are arranged alternately along the circumference. The shapes of the light-transmitting areas 111 and opaque areas 112 can be fan-shaped, rectangular, or trapezoidal, etc. This alternating distribution of light-transmitting areas 111 and opaque areas 112 forms a unique optical pattern, which can change the state of light passing through the code disk 110 when the code disk 110 rotates. The light-transmitting areas 111 allow light to pass through, while the opaque areas 112 block the propagation of light.

[0054] When light source 121 emits light, the light propagates towards the code disk 110. Due to the alternating distribution of transparent areas 111 and opaque areas 112 on the code disk 110, the light passes through these areas. When the light passes through the transparent area 111, it can pass smoothly, and the light passing through the transparent area 111 is received by the photodetector 122. As the code disk 110 rotates with the shaft under test, the transparent area 111 and the opaque area 112 continuously alternate between the light source 121 and the photodetector 122, causing the light signal received by the photodetector 122 to continuously change. This change is periodic and corresponds to the rotation angle of the code disk 110. The photodetector 122 converts this periodic change in light signal into corresponding electrical signals. The changing patterns of these electrical signals can reflect the rotation information of the code disk 110, including the number of rotations and the angle of rotation per rotation.

[0055] It should be noted that, in one possible implementation of this application, firstly, the number of light sources 121 is at least one, and when the number of light sources 121 is multiple, the multiple light sources 121 are spaced apart along the rotation direction of the code disk 110.

[0056] Specifically, in the code reading section 120 of the multi-turn absolute encoder 100, the number of light sources 121 is designed to be at least one. One light source 121 can meet the basic code reading requirements. The light emitted by it can be used to illuminate the light-transmitting area 111 and the opaque area 112 on the code disk 110, and then the conversion of light signals to electrical signals is realized through the subsequent photodetector 122.

[0057] When multiple light sources 121 are present, they can provide more sufficient and uniform illumination to the code disk 110. The interval distribution of multiple light sources 121 along the rotation direction of the code disk 110 can ensure that at any moment when the code disk 110 is rotating, at least one light source 121 can effectively illuminate the key area on the code disk 110, ensuring that the photodetector 122 can continuously and stably receive the corresponding light signal. At the same time, by setting multiple light sources 121, pulse light can be emitted to the code disk 110 from different angles. By comprehensively processing the signals received by different light sources 121, the position and rotation angle information of the code disk 110 can be obtained more accurately.

[0058] Second, such as Figure 1 and Figure 2As shown, the light source 121 and the photodetector 122 are positioned opposite each other, ensuring that light emitted from the light source 121 can be effectively transmitted to the photodetector 122, and providing a good optical path for subsequent signal detection and conversion processes. The code disk 110 is spaced between the light source 121 and the photodetector 122. Light emitted from the light source 121 is transmitted through the light-transmitting area 111 and then received by the photodetector 122. On one hand, the code disk 110 is located on the propagation path of the light emitted from the light source 121, enabling it to modulate the light; on the other hand, it ensures that the light emitted from the light source 121 and modulated by the code disk 110 reaches the photodetector 122 smoothly, improving measurement reliability.

[0059] like Figure 4 As shown, a collimating lens 130 can also be provided on the light-emitting side of the light source 121. The light emitted by the light source 121 can be collimated by the collimating lens 130 and then vertically incident into the code disk 110. After being transmitted through the light-transmitting area 111, it is received by the photodetector 122.

[0060] Third, such as Figure 2 As shown, the light source 121 and the photodetector 122 are arranged at intervals and are both located on the side of the code disk 110 away from the rotating shaft to be measured. The light emitted by the light source 121 is reflected by the light-transmitting area 111 and then received by the photodetector 122. Through reflection, the light emitted from the light source 121 and modulated by the code disk 110 can reach the photodetector 122 smoothly, which improves the reliability of the measurement.

[0061] In one embodiment of this application, the multi-turn absolute encoder 100 further includes a signal processing circuit, which is connected to the code reading unit 120. The electrical signal converted by the photodetector 122 can be amplified, filtered, and shaped by the signal processing circuit.

[0062] Specifically, the multi-turn absolute encoder 100 also includes a signal processing circuit, which is connected to the code reading unit 120. In the actual encoder manufacturing process, this connection is usually made by electrical connection, such as using wires on a printed circuit board, or by soldering to ensure the stability and low resistance of the connection, thereby reducing loss and interference during signal transmission.

[0063] The electrical signal converted by the photodetector 122 can be amplified by the signal processing circuit. When the photodetector 122 converts the optical signal into an electrical signal, the output electrical signal is often relatively weak due to various factors such as its own sensitivity, ambient light interference, and transmission distance. The amplification module in the signal processing circuit uses electronic components such as amplifiers to increase the amplitude of these weak electrical signals to meet the signal amplitude requirements of subsequent circuits, ensuring that the signal can be effectively transmitted and processed throughout the encoder system.

[0064] Simultaneously, the signal processing circuit also performs filtering operations on the electrical signal. In actual industrial environments, various interference sources exist, such as electromagnetic interference generated by nearby motors, transformers, and other equipment. This interference can mix into the electrical signal output by the photodetector 122, affecting the signal's authenticity and accuracy. The filtering module in the signal processing circuit, through specific filters such as low-pass filters, high-pass filters, and band-pass filters, can specifically remove this noise, improving signal quality and stability.

[0065] The signal processing circuit also has a shaping function, which can convert the signal into a standard digital signal form, such as a square wave signal. This standard digital signal form facilitates subsequent encoder circuits to perform counting, decoding and other operations, and helps to accurately obtain information such as the number of rotations of the code disk 110 and the rotation angle per rotation, thereby greatly improving the accuracy and reliability of the encoder output information.

[0066] The above description is merely an optional embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. A multi-turn absolute encoder, characterized in that, The application relates to a multi-turn absolute encoder, which comprises a code disc, a code reading part, an encoder circuit and an induction circuit, wherein the code disc is arranged on an inner rotating shaft part of the multi-turn absolute encoder, the inner rotating shaft part is in transmission connection with a rotating shaft to be measured to rotate synchronously, the code reading part is arranged opposite to the code disc, the encoder circuit is electrically connected with the code reading part, the induction circuit comprises a permanent magnet and an induction coil, the induction coil is connected with the encoder circuit, the permanent magnet is fixedly connected with the code disc, the induction coil is fixedly arranged opposite to the permanent magnet, the rotating shaft to be measured can drive the code disc to rotate relative to the code reading part, so that the permanent magnet moves relative to the induction coil, and the code reading part is used for acquiring the rotating turns and the single-turn rotating angle of the code disc.

2. The multi-turn absolute encoder of claim 1, wherein, The induction circuit further comprises a rectifier circuit, the rectifier circuit is connected with the induction coil and the encoder circuit respectively, and alternating current generated by the movement of the permanent magnet relative to the induction coil can be transmitted into the encoder circuit through the rectifier circuit.

3. The multi-turn absolute encoder of claim 2, wherein, The multi-turn absolute encoder further comprises a power supply battery, and the power supply battery is connected with the encoder circuit.

4. The multi-turn absolute encoder of claim 2, wherein, The multi-turn absolute encoder further comprises an energy storage capacitor, and the energy storage capacitor is connected with the encoder circuit.

5. The multi-turn absolute encoder of claim 1, wherein, The number of the permanent magnets is at least one, and when the number of the permanent magnets is multiple, the multiple permanent magnets are uniformly distributed.

6. The multi-turn absolute encoder of claim 1, wherein, The code reading part comprises a light source and a photoelectric detector, the code disc is alternately provided with multiple light-transmitting regions and multiple light-blocking regions along a circumferential direction, light emitted by the light source can pass through the light-transmitting regions and the light-blocking regions, and the light passing through the light-transmitting regions is received by the photoelectric detector and converted into an electric signal.

7. The multi-turn absolute encoder of claim 6, wherein, The number of the light sources is at least one, and when the number of the light sources is multiple, the multiple light sources are arranged at intervals along the rotating direction of the code disc.

8. The multi-turn absolute encoder of claim 6, wherein, The light source and the photoelectric detector are arranged opposite to each other, and the code disc is arranged at intervals between the light source and the photoelectric detector, the light emitted by the light source is transmitted through the light-transmitting regions and then received by the photoelectric detector.

9. The multi-turn absolute encoder of claim 6, wherein, The light source and the photoelectric detector are arranged at intervals and are located on the side, away from the rotating shaft to be measured, of the code disc, the light emitted by the light source is reflected through the light-transmitting regions and then received by the photoelectric detector.

10. The multi-turn absolute encoder of claim 6, wherein, The multi-turn absolute encoder further comprises a signal processing circuit, the signal processing circuit is connected with the code reading part, and the electric signal converted by the photoelectric detector can be amplified, filtered and shaped through the signal processing circuit.

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