CN113110148A - Low-power-consumption magnetic encoder and working method - Google Patents
Low-power-consumption magnetic encoder and working method Download PDFInfo
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- CN113110148A CN113110148A CN202110345640.6A CN202110345640A CN113110148A CN 113110148 A CN113110148 A CN 113110148A CN 202110345640 A CN202110345640 A CN 202110345640A CN 113110148 A CN113110148 A CN 113110148A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0426—Programming the control sequence
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/23—Pc programming
- G05B2219/23146—Programmable, reconfigurable via microprocessor or coding switches
Abstract
The invention discloses a low-power-consumption magnetic encoder and a working method thereof, wherein the low-power-consumption magnetic encoder comprises a magnetic ring, and the magnetic ring is arranged on an output shaft of a motor; the magnetic induction device is positioned on the outer side of the magnetic ring and comprises a first sensor and a second sensor; the power input circuit is connected with a first power supply and a second power supply, the first power supply is an external power supply, and the second power supply is a battery; the single chip microcomputer circuit is respectively connected with the power input circuit and the magnetic induction device and comprises an orthogonal decoding module and a power identification module, the power identification module identifies the type of the power supply and selects a working mode according to the type of the power supply, and when the power supply is a first power supply, the single chip microcomputer circuit enters the first working mode; and when the power supply is a second power supply, the second working mode is entered, and when the wake-up signal is detected, the first working mode is switched. The magnetic encoder can detect the type of the power supply in real time, and can detect the number of high-speed rotation turns of the encoder and realize lower power consumption by switching the working mode according to the type of the battery.
Description
Technical Field
The invention relates to the technical field of motor magnetic encoders, in particular to a low-power-consumption magnetic encoder and a working mode.
Background
The Encoder (Encoder) is a novel angle or displacement measuring device, has simple structure, high-speed rotation response speed, no influence of oil sediment, dust and structure, non-contact, small volume, low cost, simple structure, high reliability and the like, and is widely applied to angle measurement in the fields of industry, military, aviation, navigation, communication and the like.
When the external power supply stops supplying power, the rotation number of turns of the existing encoder is lost, and the number value of the turns of the existing encoder is classified as a default value after the encoder is electrified again. While periodic waking is required to confirm whether the encoder is spinning when the encoder is at rest or in inventory, there are two disadvantages to using the wake-up approach, although lower average power consumption can be achieved. First, when the motor shaft/encoder rotates at a fast speed, the encoder will wake up frequently and stay in a non-low power mode, and in this application, the passive wake-up mode loses its original advantages. Secondly, since a certain amount of time is consumed to wake up from the low power consumption mode and then detect the rotation speed, the detectable rotation speed of the encoder is usually limited, and the detection period is the wake-up time of the MCU + the detection signal time, which is not suitable for the case of high-speed rotation.
Therefore, there is a need for a magnetic encoder or a detection method that can detect the number of high-speed rotations of the encoder and achieve low power consumption.
Disclosure of Invention
In view of the above technical problems, embodiments of the present invention provide a low power consumption magnetic encoder and a working method thereof, which are used for a hollow structure, and can detect the number of turns of the encoder in high-speed rotation and realize low power consumption.
A first aspect of an embodiment of the present invention provides a low power consumption magnetic encoder, including a magnetic ring, which is disposed on an output shaft of a motor and rotates along with the output shaft; the magnetic induction device is positioned on the outer side of the magnetic ring and comprises a first sensor and a second sensor; the power supply input circuit is used for connecting a first power supply and a second power supply, the first power supply is an external power supply, and the second power supply is a battery; the single chip microcomputer circuit is respectively connected with the power input circuit and the magnetic induction device, and comprises an orthogonal decoding module and a power identification module, wherein the power identification module is used for identifying the type of a power supply and rotating a working mode according to the type of the power supply, and when the power supply is a first power supply, the single chip microcomputer circuit enters the first working mode; and when the power supply is a second power supply, entering a second working mode, and switching to the first working mode when the wake-up signal is detected.
Optionally, the first operating mode is a high performance mode, and the single chip microcomputer circuit acquires the orthogonal decoding signal generated by the orthogonal decoding module in real time to perform multi-turn counting.
Optionally, the second operating mode is a low power consumption mode, and the wake-up signal is a signal indicating that the magnetic ring rotates to a preset number of turns.
Optionally, the angle between the first sensor and the second sensor is between 0 ° and 180 °.
Optionally, the magnetic ring is a radially magnetized ring structure, and a pair of north and south magnetic poles are arranged in the magnetic ring.
A second aspect of the embodiments of the present invention provides a method for operating a low power consumption magnetic encoder, where the low power consumption magnetic encoder includes a magnetic ring disposed on an output shaft of a motor, a first sensor and a second sensor disposed outside the magnetic ring, a power input circuit for connecting an external power source and a battery, and a single chip circuit connected to the power input circuit, the first sensor, and the second sensor, respectively, and the method includes: identifying whether the power source is an external power source or a battery; when the power supply is an external power supply, entering a first working mode; and when the power supply is a battery, entering a second working mode, detecting whether a wake-up signal exists, and switching to the first working mode when receiving the wake-up signal.
Optionally, the first operating mode is a high performance mode, the single chip microcomputer circuit further includes an orthogonal decoding module, and the wake-up signal is a signal that the magnetic ring rotates to a preset number of turns.
Optionally, the second operating mode is a low power consumption mode, and the orthogonal decoding module performs orthogonal decoding according to a received signal transmitted by the magnetic induction device and obtains the number of rotations of the magnetic ring according to the orthogonal decoded signal.
Optionally, the angle between the first sensor and the second sensor is between 0 ° and 180 °.
Optionally, the magnetic ring is a radially magnetized ring structure, and a pair of north and south magnetic poles are arranged in the magnetic ring.
In the technical scheme provided by the embodiment of the invention, the power supply identification module identifies whether the power supply is an external power supply or a battery, the external power supply is switched to a high-performance mode, and the single chip microcomputer circuit acquires an orthogonal decoding signal generated by the orthogonal decoding module in real time to count for multiple circles; when the power supply is a battery, the power supply is switched to a low power consumption mode, waits for a wake-up signal, and is switched to a high-performance mode when the magnetic ring rotates to a preset number of turns. The magnetic encoder can detect the type of a power supply in real time, switches the working mode according to the type of a battery, and adopts an interrupt triggering mode in a low power consumption mode, so that the number of turns of high-speed rotation of the encoder can be detected, and lower power consumption can be realized.
Drawings
FIG. 1 is a schematic view of the installation of the low power magnetic encoder of the present invention;
FIG. 2 is a schematic diagram of the internal structure of a low power consumption magnetic encoder according to the present invention;
FIG. 3 is a flow chart of a method of operating a low power consumption magnetic encoder according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present application provides a low power consumption magnetic encoder, please refer to fig. 1 and fig. 2, the magnetic encoder includes a magnetic ring 10, a magnetic induction device 30, a power input circuit 40 and a single chip circuit 50, the magnetic ring 10 is disposed on an output shaft 2 of a motor and rotates synchronously with the output shaft 2; the magnetic ring 10 is a radial magnetizing ring structure, a pair of north and south magnetic poles are arranged in the magnetic ring 10, the center of the magnetic ring 10 is concentric with the axis of the output shaft 2, and the magnetic ring 10 is ensured to rotate on the same path all the time at all the positions of the outer ring in the rotating process. The magnetic induction device 30 is positioned outside the magnetic ring 10 and comprises a first sensor 31 and a second sensor 32; the first sensor 31 and the second sensor 32 are both disposed on a circuit board, the circuit board is disposed above the magnetic ring 10 or below the magnetic ring 10, and the circuit board and the output shaft 2 of the motor are in a non-contact type and can move relatively.
The circle centers of the first sensor 31 and the second sensor 32 are coaxially arranged with the circle center of the magnetic ring 10 and move relatively, the first sensor 31 and the second sensor 32 induce the magnetic field of the magnetic ring 10 and convert the magnetic field into corresponding voltage signals, and the first sensor 31 and the second sensor 32 induce the rotation position of the magnetic ring 10 by means of the rotation of the output shaft 2 and transmit the rotation position to the single chip microcomputer circuit 50.
The power input circuit 40 is used for connecting a power source, the power source includes a first power source and a second power source, the first power source is an external power source, the second power source is a battery, the battery is a standby power source, and when the external power source cannot supply power, the battery continues to supply power as the external power source.
The single chip microcomputer circuit 50 is respectively connected with the power input circuit 40 and the magnetic induction device 30, the single chip microcomputer circuit 50 comprises an orthogonal decoding module 51 and a power identification module 52, the power identification module 52 is used for identifying the type of a power supply and selecting a working mode according to the type of the power supply, when the power supply is an external power supply, the single chip microcomputer circuit enters a first working mode, the first working mode is a high-performance mode, and the single chip microcomputer circuit 50 acquires orthogonal decoding signals generated by the orthogonal decoding module 51 in real time to perform multi-turn counting. And when the power supply is a battery, entering a second working mode, wherein the second working mode is a low-power-consumption mode, detecting whether a wake-up signal exists or not in the low-power-consumption mode, switching to a high-performance mode when the wake-up signal is detected, and otherwise, still keeping the magnetic encoder in the low-power-consumption mode. The wake-up signal is a signal that the magnetic ring 10 rotates to a preset number of turns, specifically, the number of turns of the magnetic ring 10 is detected through the orthogonal decoding module 51, when the magnetic ring 10 rotates to the preset number of turns, the wake-up signal is generated, the single chip microcomputer circuit 50 receives the wake-up signal and switches to a high-performance mode, the single chip microcomputer circuit 50 performs multi-turn counting, and when the wake-up signal is not detected, the whole system is still in a low-power consumption mode.
The power identification module 52 of the present invention is used for identifying the type of the battery, in one embodiment, the type of the battery is detected by the single chip, specifically, the battery power supply or the external power supply is detected by the I/O pin of the single chip, the I/O pin is connected to the single chip of the external circuit, when the external power supply supplies power, the single chip of the external circuit works, where the I/O pin is at a high level, and the magnetic encoder identifies the external power supply as the external power supply power. When the battery supplies power, the singlechip of the external circuit does not work, the I/O pin is at low level, and the magnetic encoder identifies that the battery supplies power.
The included angle between the first sensor 31 and the second sensor 32 is any angle within the range of 0-180 degrees, namely, the interference resistance to the change of the magnetic field is stronger due to a certain angle between the first sensor 31 and the second sensor 32. In order to achieve a better detection angle, the included angle formed between the first sensor 31 and the second sensor 32 is 90 °, and the interference resistance is optimal.
In the high-performance mode, the multi-turn counting part counts a plurality of turns in real time; when the magnetic ring 10 rotates to a preset number of turns, for example 1/4 turns, the wake-up signal is output, and the multi-turn counting part is awakened to start counting.
In the process of one rotation of the motor, the magnetic field is from the N pole to the S pole and then to the N pole, the first sensor 31 and the second sensor 32 respectively generate two signals, one is a rising edge and one is a falling edge, when the included angle between the first sensor 31 and the second sensor 32 is 90 degrees, jump edge signals formed by the two rising edge signals and the two falling edge signals are uniformly distributed and jump, and each jump edge signal corresponds to 1/4 circles. Referring to fig. 2, the number of rotations of the magnetic ring 10 and the direction of rotation can be known by the edge signals through orthogonal decoding.
The invention has the advantages that when the power supply of the magnetic encoder stops supplying power, the standby power supply works, when the battery supplies power, the multi-turn counting part enters an intermittent working state, namely, a low-power-consumption mode, so that the electric quantity of the battery is saved, and after the main power supply of the encoder is electrified, namely, after the external power supply supplies power, the multi-turn counting part is switched to supply power to the power supply of the encoder, so that the electric quantity of the standby power supply is further saved. When the multi-turn counting part works in an intermittent mode, the shorter the scanning interval time is, the larger the battery power consumption is; the invention awakens the multi-turn counting part by detecting whether the magnetic ring rotates for the preset number of turns, saves the electric quantity of the battery, and simultaneously can ensure that the encoder can accurately count the number of turns when the power supply stops supplying power.
Referring to fig. 3, an embodiment of the present application provides an operating method of a low power consumption magnetic encoder, where the operating method includes:
in step S10, it is identified whether the power supply is an external power supply or a battery. The power supply identification module is used for identifying the type of a battery, in one embodiment, the type of the battery is detected through a single chip microcomputer, specifically, whether the battery is powered by the battery or the external power supply is detected through an I/O pin of the single chip microcomputer, the I/O pin is connected with the single chip microcomputer of an external circuit, when the external power supply supplies power, the single chip microcomputer of the external circuit works, the I/O pin is in a high level, and a magnetic encoder identifies that the external power supply supplies power. When the battery supplies power, the singlechip of the external circuit does not work, the I/O pin is at low level, and the magnetic encoder identifies that the battery supplies power.
In step S20, when the power supply is external, the first operation mode is entered. Wherein the first operating mode is a high performance mode. And under the high-performance mode, the single chip microcomputer circuit acquires the orthogonal decoding signals generated by the orthogonal decoding module in real time to carry out multi-turn counting. This mode can detect a high speed revolution number signal.
Step S30, when the power source is a battery, the second operating mode is entered, whether there is a wake-up signal is detected, and step S31 is executed when the wake-up signal is received.
Step S31, wake up from the low power mode and perform multi-turn counting.
The second working mode is a low power consumption mode, whether a wake-up signal exists or not is detected in the low power consumption mode, when the wake-up signal is detected, the high performance mode is switched to the high performance mode, and otherwise, the low power consumption mode is still adopted. And in the low power consumption mode, the magnetic induction device is in a sleep mode. The wake-up signal is a signal generated when the magnetic ring rotates to a preset number of turns, specifically, the number of turns of the magnetic ring is detected through the orthogonal decoding module, when the magnetic ring rotates to the preset number of turns, the wake-up signal is generated and transmitted to the single chip microcomputer circuit, the single chip microcomputer circuit is switched to a high-performance mode to perform multi-turn counting, and when the wake-up signal is not detected, the whole system is still in a low-power-consumption mode.
The power supply identification module identifies whether the power supply is an external power supply or a battery, the external power supply is switched to a high-performance mode, and the single chip microcomputer circuit acquires an orthogonal decoding signal generated by the orthogonal decoding module in real time to perform multi-turn counting; when the power supply is a battery, the power supply is switched to a low power consumption mode, waits for a wake-up signal, and is switched to a high-performance mode when the magnetic ring rotates to a preset number of turns. The invention detects the type of the power supply in real time, switches the working mode according to the type of the battery, and adopts the interrupt triggering mode in the low power consumption mode, thereby not only detecting the high-speed rotation turns of the encoder, but also realizing lower power consumption.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A low power magnetic encoder, the magnetic encoder comprising:
the magnetic ring is arranged on the output shaft of the motor and rotates along with the output shaft;
the magnetic induction device is positioned on the outer side of the magnetic ring and comprises a first sensor and a second sensor;
the power supply input circuit is used for connecting a first power supply and a second power supply, the first power supply is an external power supply, and the second power supply is a battery;
the single chip microcomputer circuit is respectively connected with the power input circuit and the magnetic induction device, and comprises an orthogonal decoding module and a power identification module, wherein the power identification module is used for identifying the type of a power supply and selecting a working mode according to the type of the power supply, and when the power supply is a first power supply, the single chip microcomputer circuit enters the first working mode; and when the power supply is a second power supply, entering a second working mode, and switching to the first working mode when the wake-up signal is detected.
2. The low power consumption magnetic encoder according to claim 1, wherein the first operating mode is a high performance mode, and the single chip circuit obtains the quadrature decoding signal generated by the quadrature decoding module in real time for multi-turn counting.
3. The low power consumption magnetic encoder as claimed in claim 2, wherein the second operation mode is a low power consumption mode, and the wake-up signal is a signal that the magnetic ring rotates for a preset number of turns.
4. The low power magnetic encoder of claim 1, wherein the angle between the first and second sensors is between 0 ° and 180 °.
5. The low power consumption magnetic encoder as claimed in claim 1, wherein the magnetic ring is a radially magnetized ring structure, and a pair of north and south magnetic poles are disposed in the magnetic ring.
6. A working method of a low-power-consumption magnetic encoder is characterized in that the low-power-consumption magnetic encoder comprises a magnetic ring arranged on an output shaft of a motor, a first sensor and a second sensor which are positioned outside the magnetic ring, a power input circuit used for connecting an external power supply and a battery, and a single chip circuit respectively connected with the power input circuit, the first sensor and the second sensor, and the working method comprises the following steps:
identifying whether the power source is an external power source or a battery;
when the power supply is an external power supply, entering a first working mode;
and when the power supply is a battery, entering a second working mode, detecting whether a wake-up signal exists, and switching to the first working mode when receiving the wake-up signal.
7. The operating method of a low power consumption magnetic encoder as claimed in claim 6, wherein the single chip circuit further comprises a quadrature decoding module, the first operating mode is a high performance mode, and the wake-up signal is a signal of a magnetic ring rotating for a predetermined number of turns.
8. The operating method of a low power consumption magnetic encoder as claimed in claim 7, wherein the second operating mode is a low power consumption mode, and the quadrature decoding module performs quadrature decoding according to the received signal transmitted by the magnetic induction device and obtains the number of rotations of the magnetic ring according to the quadrature decoded signal.
9. The method of claim 7, wherein the angle between the first sensor and the second sensor is between 0 ° and 180 °.
10. The operating method of a low power consumption magnetic encoder as claimed in claim 7, wherein the magnetic ring is a radially magnetized ring structure, and a pair of north and south magnetic poles are disposed in the magnetic ring.
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| CN202110345640.6A CN113110148A (en) | 2021-03-31 | 2021-03-31 | Low-power-consumption magnetic encoder and working method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847934A (en) * | 2021-09-24 | 2021-12-28 | 深圳市灵犀自动化技术有限公司 | Position determination method and device of hybrid encoder |
| CN114061627A (en) * | 2021-11-01 | 2022-02-18 | 之江实验室 | Electronic multi-turn absolute value encoder system, device and working method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114061627A (en) * | 2021-11-01 | 2022-02-18 | 之江实验室 | Electronic multi-turn absolute value encoder system, device and working method |
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Application publication date: 20210713 |