CN217590515U - Encoder and motor - Google Patents

Abstract

The application relates to an encoder and motor, the encoder includes magnetic chip, microcomputer and temperature detection circuitry, magnetic chip and temperature detection circuitry respectively with the microcomputer connects, wherein: the magnetic chip is used for acquiring initial position information of the rotor and sending the initial position information to the microcomputer; the temperature detection circuit is used for detecting the temperature of the motor and outputting a temperature sensing signal to the microcomputer according to the temperature of the motor; and the microcomputer is used for obtaining position deviation information based on the initial position information and the target position information, determining the temperature information of the motor according to the temperature sensing signal, and sending the position deviation information and the temperature information to a controller of the motor. Through the motor encoder, the technical problems that the motor encoder is single in function and the task of the motor controller is too heavy are solved, and the working efficiency and the protection effect of the motor are improved.

Description

Encoder and motor

Technical Field

The application relates to the field of motors, in particular to an encoder and a motor.

Background

With the continuous development of the technology, the motor has more and more extensive application scenes as an electromagnetic device for converting or transmitting electric energy. The motor mainly comprises a generator, a motor and the like, wherein the generator is driven by power machines such as a water turbine, a steam turbine, a diesel engine and the like to convert kinetic energy into electric energy, and the motor is used for converting the electric energy into mechanical energy to drive various machines. With the complexity and diversification of use scenes, the requirements of the motor on functions, manufacturing processes, materials, precision and the like are continuously increased.

In the prior art, the motor often includes a motor encoder for compiling and converting signals and data of the motor to obtain information that can be used for communication, transmission and storage. However, in the prior art, the motor encoder usually has only a position data detection function, and other service functions need to be implemented by the motor controller. Because the motor encoder has higher computing power, the computing resources of the encoder cannot be fully utilized in the prior art, and the motor controller needs to be responsible for other functional services while controlling the motor, so that the motor encoder has single function and the task of the motor controller is too heavy.

Aiming at the technical problems that the motor encoder has single function and the motor controller has too heavy task in the related art, no effective solution is provided at present.

SUMMERY OF THE UTILITY MODEL

In the embodiment, an encoder and a motor are provided to solve the problem that the motor encoder in the related art has a single function and the task of a motor controller is too heavy.

In a first aspect, the present embodiment provides an encoder applied to a motor, the encoder includes a magnetic chip, a microcomputer and a temperature detection circuit, the magnetic chip and the temperature detection circuit are respectively connected to the microcomputer, wherein:

the magnetic chip is used for acquiring initial position information of the rotor and sending the initial position information to the microcomputer;

the temperature detection circuit is used for detecting the temperature of the motor and outputting a temperature sensing signal to the microcomputer according to the temperature of the motor;

and the microcomputer is used for obtaining position deviation information based on the initial position information and the target position information, determining the temperature information of the motor according to the temperature sensing signal, and sending the position deviation information and the temperature information to a controller of the motor.

In some embodiments, the encoder further comprises a first SPI communication interface, and the first SPI communication interface is connected to the magnetic chip and the microcomputer, respectively, wherein:

and the first SPI communication interface is used for receiving the initial position information sent by the magnetic chip and sending the initial position information to the microcomputer.

In some embodiments, the position deviation information includes angle deviation information, the microcomputer includes a central processing unit and a Flash memory, the central processing unit is connected to the Flash memory, wherein:

the Flash memory is used for storing the angle deviation information;

and the central processing unit is used for acquiring the angle deviation information from the Flash memory and obtaining actual angle information based on the angle deviation information.

In some of the embodiments, the temperature detection circuit includes a power source, a first resistor, a second resistor, one end of the first resistor is connected to one end of the second resistor, the other end of the first resistor is connected to the power source, and the other end of the second resistor is connected to the microcomputer, wherein:

the power supply is used for supplying power to the temperature detection circuit;

the first resistor is a constant value resistor and is used for dividing the voltage input by the power supply;

the second resistor is used for outputting a first voltage signal according to the internal temperature of the motor;

the microcomputer is used for acquiring the first voltage signal and determining the temperature information of the motor based on the first voltage signal.

In some of these embodiments, the second resistor is a thermistor.

In some embodiments, the temperature detection circuit further comprises a filter capacitor, one end of the filter capacitor is connected to the second resistor, and the other end of the filter capacitor is grounded, wherein:

the filter capacitor is used for filtering the first voltage signal.

In a second aspect, in this embodiment, there is provided a motor, further comprising a controller, and the encoder is connected to the controller, wherein:

the encoder is further used for obtaining actual position information according to the position deviation information and sending the actual position information to the controller;

and the controller is used for receiving the actual position information and the temperature information sent by the encoder and controlling the motor based on the actual position information and the temperature information.

In some of these embodiments, the electric machine further comprises a rotor and a stator, the encoder and rotor being located inside the stator, wherein:

the stator is fixed in the motor and used for generating a magnetic field;

the rotor is used for rotating in a magnetic field to realize energy conversion.

In some of these embodiments, the motor further comprises an alarm device connected to the controller, wherein:

the controller is used for judging whether the temperature of the motor exceeds a preset temperature threshold value or not, and if so, outputting an alarm instruction to the alarm device;

and the alarm device is used for outputting an alarm signal when receiving the alarm instruction.

In some of these embodiments, the electric machine comprises magnetic steel located inside the rotor, wherein:

the magnetic steel is used for forming a magnetic field inside the motor together with the stator of the motor;

and the magnetic chip is used for determining the initial position information of the rotor according to the magnetic field position change of the magnetic steel.

Compared with the prior art, the encoder and the motor provided in this embodiment, the encoder includes a magnetic chip, a microcomputer and a temperature detection circuit, the magnetic chip and the temperature detection circuit are respectively connected with the microcomputer, wherein: the magnetic chip is used for acquiring initial position information of the rotor and sending the initial position information to the microcomputer; the temperature detection circuit is used for detecting the temperature of the motor and outputting a temperature sensing signal to the microcomputer according to the temperature of the motor; and the microcomputer is used for obtaining position deviation information based on the initial position information and the target position information and determining the temperature information of the motor according to the temperature sensing signal. Through the temperature detection function and the position correction function integrated to the encoder with the motor to reduce the task of controller, solved motor encoder's function singleness, and motor controller's task is too heavy technical problem, has improved the work efficiency and the protective effect of motor.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the application.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a block diagram of an encoder according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a temperature detection circuit according to an embodiment of the present invention;

fig. 3 is a schematic diagram of the magnetic steel and the magnetic chip according to an embodiment of the present invention.

Detailed Description

For a clearer understanding of the objects, aspects and advantages of the present application, reference is made to the following description and accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the same general meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (including a reference to the context of the specification and claims) are to be construed to cover both the singular and the plural, as well as the singular and plural. The terms "comprises," "comprising," "has," "having" and any variations thereof, as referred to in this application, are intended to cover non-exclusive inclusions; for example, a system, product, or apparatus that comprises a list of modules (elements) is not limited to the modules (elements) listed, but may include other modules (elements) not listed or inherent to such product or apparatus. Reference in this application to "connected," "coupled," and the like is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference to "a plurality" in this application means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. In general, the character "/" indicates a relationship in which the objects associated before and after are an "or". The terms "first," "second," "third," and the like in this application are used for distinguishing between similar items and not necessarily for describing a particular sequential or chronological order.

The utility model provides an encoder and motor, the device are used for realizing following embodiment and preferred embodiment. The terms "module," "unit," "subunit," and the like, as used hereinafter, may implement hardware of a predetermined function, and combinations thereof.

The motor encoder used in the prior art often only has a position detection function, that is, position information of the encoder is acquired through a magnetic field, and position data is converted through a communication protocol to be sent to a processor, so that the calculation performance of the processor in the encoder is wasted. Meanwhile, all logic tasks in the motor are realized by the motor controller, so that the tasks of the controller are relatively heavy. Therefore, for more performance that utilizes motor encoder, reduce the complexity of controller control motor, the utility model provides a new encoder to reduce the load of controller, and can be better learn the operating condition of motor, and realize new function.

Referring to fig. 1, fig. 1 is a block diagram of an encoder according to an embodiment of the present invention. In the present embodiment, the encoder includes a magnetic chip 10, a microcomputer 20 and a temperature detection circuit 30, the magnetic chip 10 and the temperature detection circuit 30 are respectively connected to the microcomputer 20, wherein: a magnetic chip 10 for acquiring initial position information of the rotor and transmitting the same to the microcomputer 20; a temperature detection circuit 30 for detecting the motor temperature and outputting a temperature sensing signal to the microcomputer 20 according to the motor temperature; and the microcomputer 20 is used for obtaining position deviation information based on the initial position information and the target position information, determining temperature information of the motor according to the temperature sensing signal, and sending the position deviation information and the temperature information to a controller of the motor.

Illustratively, the core chip 10 is connected to the microcomputer 20, wherein the core chip 10 reads initial position information of the rotor according to magnetic field information inside the motor and transmits the initial position information to the microcomputer 20; the microcomputer 20 receives the initial position information transmitted from the core plate 10 and determines the position deviation information from the initial position information and the target position information, wherein the target position information is the position information of the current encoder standard, that is, the current actual position information of the rotor. It can be understood that when the microcomputer outputs the position data, due to the influence of the mounting process, the ambient temperature, the size of the component, and the like, the rotor often cannot reach the position point required by the position data, that is, the actual position data reached by the rotor often deviates from the position data output by the microcomputer. Therefore, before the motor is used, the position deviation information of the rotor is obtained through the initial position information and the target position information of the rotor, so that the position data output by the encoder is corrected based on the position deviation information in the subsequent use process, and the position data sent to the controller by the encoder is consistent with the actual position data reached by the rotor.

In one embodiment, the initial position information is the rotation position read by the magnetic core 10, and the target position information is the actual rotation position of the rotor, and the position deviation information is the difference between the two rotation positions. In the positioning process, the motor outputs torque through the variable frequency controller, so that the actual rotation position of the rotor becomes 0, and the value of the rotation position acquired by the magnetic chip 10 is equal to the difference value of the rotation positions.

Specifically, the automatic positioning function of the motor is generally realized by the variable frequency controller, that is, when the motor or the variable frequency controller is replaced at every time, the position correction is manually realized by the variable frequency controller. For users unfamiliar with the variable frequency controller, technical support is often required to realize the positioning operation of the motor. And after the delivery test of the motor is finished, the positioning operation is also needed when the variable frequency controller is adapted, so that the working process is further increased, and the production time of the motor is prolonged. In the embodiment, the automatic positioning function is realized through the encoder, the positioning and zero setting are automatically carried out when the motor is subjected to factory test, the motor or the variable frequency controller can be replaced randomly, the motor is convenient to operate, and the production time of the variable frequency controller in a production workshop is reduced.

Illustratively, a temperature detection circuit 30 is connected to the microcomputer 20, wherein the temperature detection circuit 30 is configured to detect a temperature inside the motor through a temperature sensing component, generate a temperature sensing signal according to the temperature of the motor, and transmit the temperature sensing signal to the microcomputer 20. Specifically, the temperature sensing component includes, but is not limited to, a positive temperature coefficient thermistor (PTC), a negative temperature coefficient thermistor (NTC), and a thermocouple, and the temperature sensing component and the object to be measured may be connected in a contact manner or a non-contact manner; the temperature sensing signal may be a voltage signal, a current signal, or other electrical signals, which is not limited in this embodiment.

Specifically, in the prior art, a temperature detection module of a motor is generally installed on a motor casing, and a thermistor acquires a temperature signal and converts the temperature signal into a voltage, current and other temperature electrical signals. The thermistor is connected to an interface of the controller through a cable, thereby transmitting a temperature electric signal to the controller. The prior art solution results in excessive interfaces and cables for the controller, increasing the complexity of the motor system and thus the hardware cost of the motor. In this embodiment, the thermistor is located in the encoder, and the detected temperature electrical signal of the motor is directly sent to the microcomputer 20 in the encoder, so that the design of the temperature detection system inside the motor is simpler and more convenient, and the hardware cost of the motor is reduced.

The encoder in this embodiment includes a magnetic chip 10, a microcomputer 20 and a temperature detection circuit 30, the magnetic chip 10 and the temperature detection circuit 30 are respectively connected to the microcomputer 20, wherein: a magnetic chip 10 for acquiring initial position information of the rotor and transmitting the initial position information to the microcomputer 20; a temperature detection circuit 30 for detecting the motor temperature and outputting a temperature sensing signal to the microcomputer 20 according to the motor temperature; and a microcomputer 20 for obtaining position deviation information based on the initial position information and the target position information, determining temperature information of the motor according to the temperature sensing signal, and transmitting the position deviation information and the temperature information to a controller of the motor. Through the temperature detection function and the position correction function integrated to the encoder with the motor to reduce the task of controller, solved motor encoder's function singleness, and motor controller's task is too heavy technical problem, has improved the work efficiency and the protective effect of motor.

In another embodiment, the encoder further comprises a first SPI communication interface, which is respectively connected with the magnetic chip 10 and the microcomputer 20, wherein: and the first SPI communication interface is configured to receive the initial position information sent by the magnetic chip 10 and send the initial position information to the microcomputer 20.

Illustratively, the encoder further includes a first SPI communication interface inside, and the first SPI communication interface is connected to the magnetic chip 10 and the microcomputer 20 respectively, so as to implement data interaction between the magnetic chip 10 and the microcomputer 20. The first SPI communication interface is configured to acquire initial position information sent by the magnetic chip 10, and forward the initial position information to the microcomputer 20 based on an SPI communication protocol.

Specifically, after acquiring the initial position information, the magnetic chip 10 processes the initial position information based on the SPI protocol, and sends the initial position information to the microcomputer 20 through the first SPI communication interface; the microcomputer 20 parses and further processes the received packet based on the SPI protocol to obtain initial location information. The SPI protocol realizes data communication through a serial peripheral interface, and only four wires are occupied on pins, so that the internal space of the encoder is saved, and the communication complexity is reduced.

In another embodiment, the positional deviation information includes angular deviation information, the microcomputer 20 includes a central processor 21 and a Flash memory 22, the central processor 21 is connected with the Flash memory 22, wherein: a Flash memory 22 for storing angle deviation information; and the central processing unit 21 is used for acquiring the angle deviation information from the Flash memory 22 and obtaining the actual angle information based on the angle deviation information.

Illustratively, the microcomputer 20 includes a central processor 21 and a Flash memory 22 to implement the functions of operation and storage, respectively, the central processor 21 and the Flash memory 22 being connected to each other. The Flash memory 22 is configured to store angle deviation information of the encoder, and the central processor 21 is configured to read the angle deviation information stored in advance in the Flash memory 22, obtain actual angle information based on the angle deviation information, and send the actual angle information to the controller, so that the controller controls the angle of the rotor based on the actual angle information. It will be appreciated that since the actual angle information sent to the controller is corrected, the final angle reached by the rotor is equal to the value of the actual angle information.

In one embodiment, the initial position information is an electrical angle of the rotor detected by the encoder, the target position information is an actual mechanical angle of the rotor, and the position deviation information is a difference between the electrical angle and the mechanical angle. In the motor positioning process, the variable frequency controller outputs torque, so that the mechanical angle of the rotor becomes 0, and the electrical angle read by the encoder is the difference value between the electrical angle and the mechanical angle. The difference is stored as angle deviation information in the Flash memory 22. In the subsequent control process, before outputting the angle data to the controller, the central processing unit 21 corrects the angle data according to the angle deviation information to obtain actual angle information, so that the angle reached by the rotor is equal to the actual angle information, and the automatic positioning function of the encoder is realized.

Optionally, to prevent the Flash memory 22 from being damaged, the Flash memory 22 is checked by an exclusive or check before the central processing unit 21 reads the Flash memory 22. Specifically, when the angle deviation information is stored in the Flash memory 22 each time, the check value of the angle deviation information is stored in the Flash memory 22 in an exclusive or check mode, and the data check is performed on the check value of the angle deviation information before the central processing unit 21 reads the angle deviation information each time, so that the accuracy of the angle deviation information is ensured. And if an error occurs in the checking process, outputting an error prompt signal to remind a user of replacing the encoder chip or the motor in time.

In this embodiment, the position deviation information includes angle deviation information, the microcomputer 20 includes a central processing unit 21 and a Flash memory 22, the central processing unit 21 is connected to the Flash memory 22, wherein: a Flash memory 22 for storing angle deviation information; and the central processing unit 21 is used for acquiring the angle deviation information from the Flash memory 22 and obtaining the actual angle information based on the angle deviation information. By storing the angle deviation information in the Flash memory 22, the central processing unit 21 directly reads the angle deviation information in the Flash memory 22 in the subsequent process to correct the angle data output by the encoder, so that the automatic positioning function of the encoder is realized, the position correction is not required to be performed manually during the subsequent replacement of the motor or the encoder, and the production efficiency and the working efficiency of the motor are improved.

In another embodiment, the temperature detection circuit 30 includes a power source, a first resistor, and a second resistor, one end of the first resistor is connected to one end of the second resistor, the other end of the first resistor is connected to the power source, and the other end of the second resistor is connected to the microcomputer 20, wherein: a power supply for supplying power to the temperature detection circuit 30; the first resistor is a constant value resistor and is used for dividing the voltage input by the power supply; the second resistor is used for acquiring a first voltage signal according to the internal temperature of the motor; and a microcomputer 20 for acquiring the first voltage signal and determining temperature information of the motor based on the first voltage signal.

Illustratively, the temperature detection circuit 30 includes a power source, a first resistor, and a second resistor, wherein the first resistor is connected in series with the second resistor, the other end of the first resistor is connected to the power source, and the other end of the second resistor is connected to the microcomputer 20. The power supply is used for supplying power to the temperature detection circuit 30, and in one embodiment, the power supply is a direct current power supply; the resistance value of the first resistor is fixed and is used for dividing the voltage input by the power supply; it will be appreciated that the sum of the voltages of the first and second resistors is equal to the voltage of the power supply input; the second resistor can be used as a temperature sensor, when the temperature in the motor changes, the resistance value of the second resistor changes, the voltage of the second resistor also changes, and the voltage value is a temperature sensing signal; and the microcomputer 20 is used for acquiring a temperature sensing signal of the second resistor and determining the internal temperature of the motor according to a preset relation between the voltage and the temperature of the second resistor.

Optionally, when the microcomputer 20 detects that the motor temperature exceeds 75 ℃, a first temperature warning signal is sent to the controller to prompt the controller that the current motor temperature has exceeded 75 ℃. Specifically, the temperature warning signal may be sent in an SPI communication manner. When the microcomputer 20 detects that the motor temperature exceeds 85 ℃, a second temperature warning signal is sent to the controller to prompt the controller that the current motor temperature exceeds the maximum value, so that the controller controls the motor to stop running.

Alternatively, in some special cases, the temperature of the coil of the motor rises too fast, the temperature of the shell of the motor cannot quickly follow the temperature rise of the coil, and the temperature detected by the encoder is the temperature of the motor shell, so that the temperature of the coil of the motor exceeds 160 ℃ and the temperature of the motor shell is lower than 75 ℃. At this time, the motor may be burnt out, but the temperature of the shell detected by the encoder still does not reach the early warning value. Therefore, it is necessary to detect the rate of rise of the motor temperature and compare the rate of rise with a rise threshold. Specifically, when the temperature rising rate of the motor shell exceeds 1.5 ℃/min, a third temperature warning signal is sent to the controller to prompt that the temperature of the motor of the controller rises too fast, the motor possibly has damage risks, and the motor controller can directly control the motor to stop running at the moment so as to prevent the temperature of the motor from continuously rising. When the temperature rise rate was below 1.0 deg.C/min, an attempt was made to resume operation after a 5 minute delay. Further, if the number of times that the temperature rising speed reaches the rising threshold value after each power-on exceeds 3 times, the operation is not resumed, and a user is prompted to detect the motor.

Temperature detect circuit 30 includes power, first resistance, second resistance in this embodiment, acquires the inside temperature signal of electricity through second resistance through integrated temperature detect circuit 30 in the encoder, and then detects the inside temperature of motor, guarantees that the inside temperature of motor is in safety range all the time, has improved the security of motor to the complexity of motor internal system has been reduced.

In another embodiment, the second resistor is a thermistor.

Illustratively, the second resistor may be a positive temperature coefficient thermistor (PTC) or a negative temperature coefficient thermistor (NTC). It can be understood that the thermistor has the advantages of high sensitivity, wide temperature detection range, small size, high stability and the like, the accuracy of the temperature detection circuit is improved, and the hardware cost is reduced.

In another embodiment, the temperature detecting circuit 30 further includes a filter capacitor, one end of the filter capacitor is connected to the second resistor, and the other end of the filter capacitor is grounded, wherein: and the filter capacitor is used for filtering the first voltage signal.

Illustratively, a filter capacitance is provided in the temperature detection circuit based on the characteristic of the capacitance impeding the rate of change of the voltage. Because the voltage at the two ends of the filter capacitor can not be suddenly changed, the first voltage signal can be smoothly filtered, so that the first voltage signal acquired by the microcomputer 20 can not be fluctuated too much.

Referring to fig. 2, fig. 2 is a schematic diagram of a temperature detection circuit according to an embodiment of the present invention. Illustratively, the temperature detection circuit 30 includes a power source VCC, a first resistor R1, a second resistor R2, and a filter capacitor C1, wherein one end of the filter capacitor C1 is connected to the second resistor R2, and the other end is grounded, so as to filter the voltage signal of the second resistor R2. It will be appreciated that the voltage across the filter capacitor C1 is the same as the second resistor R2. The microcomputer 20 can directly obtain the voltage across the filter capacitor C1 as the temperature sensing signal output by the temperature detection circuit 30.

Specifically, the microcomputer 20 acquires the temperature sensing signal by means of AD sampling. In one embodiment, the AD sampling mode is sampling every second, and the average value of every 10 sampling results is used as a valid sampling result. It can be understood that, as the temperature of the motor changes, the resistance of the second resistor R2 also changes, so that the voltage across the second resistor R2 changes, and the voltage across the second resistor R2 is directly input to the AD sampling interface of the microcomputer 20 to implement temperature sampling. And converting the sampling result into temperature information through the preset corresponding relation between the sampling result and the temperature.

In another embodiment, the utility model also discloses a motor, including the encoder in any above-mentioned embodiment to the motor still includes the controller, and the encoder is connected with the controller, wherein: the encoder is also used for obtaining actual position information according to the position deviation information and sending the actual position information to the controller; and the controller is used for receiving the actual position information and the temperature information sent by the encoder and controlling the motor based on the actual position information and the temperature information.

For example, after the encoder acquires the position deviation information, the encoder obtains actual position information according to the position deviation information, where the actual position information is an actual position that the controller needs to control the rotor to reach. The actual position information and the temperature information are sent to the controller, and the controller adjusts and controls the position of the rotor of the motor and the internal temperature after receiving the actual position information and the temperature information, so that the functions of positioning and temperature control of the motor are achieved.

In another embodiment, the motor further comprises a rotor and a stator, the encoder and the rotor being located inside the stator, wherein: the stator is fixed in the motor and used for generating a magnetic field; the rotor is used to rotate in a magnetic field to achieve energy conversion.

In another embodiment, the motor further comprises an alarm device connected to the controller, wherein: the controller is used for judging whether the temperature of the motor exceeds a preset temperature threshold value or not, and if so, outputting an alarm instruction to the alarm device; and the alarm device is used for outputting an alarm signal when receiving the alarm instruction.

Illustratively, after acquiring the temperature information of the motor, the controller judges whether the temperature of the motor exceeds a preset temperature threshold value, and if so, outputs an alarm instruction to an alarm device in the motor so as to control the alarm device to output alarm information to a user in time. The preset temperature threshold is a temperature threshold which is manually preset, and in one specific embodiment, the preset temperature threshold is 75 ℃.

In another embodiment, the electric machine comprises magnetic steel located inside the rotor, wherein: the magnetic steel is used for forming a magnetic field inside the motor together with the stator of the motor; and the magnetic chip 10 is used for determining initial position information of the rotor according to the position change of the magnetic field of the magnetic steel in the rotor.

Referring to fig. 3, fig. 3 is a schematic diagram of a magnetic steel and a magnetic chip according to an embodiment of the present invention. Illustratively, the motor rotor includes magnetic steel, forms a motor internal magnetic circuit together with a stator of the motor, and is connected with the core plate 10. The magnetic chip 10 is configured to obtain magnetic field position change information of the rotor magnetic steel in the internal magnetic field of the motor, and determine initial position information of the rotor based on the magnetic field position change information. The motor rotor is a rotating part in the motor, and the magnetic steel is a permanent magnet material and is arranged in the motor rotor.

It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to be limiting. All other embodiments, which can be derived by a person skilled in the art from the examples provided herein without inventive step, shall fall within the scope of protection of the present application.

It is obvious that the drawings are only examples or embodiments of the present application, and it is obvious to those skilled in the art that the present application can be applied to other similar cases according to the drawings without creative efforts. Moreover, it should be appreciated that such a development effort might be complex and lengthy, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, and is not intended to limit the present disclosure to the particular forms disclosed herein.

Reference throughout this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly or implicitly understood by one of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the patent protection. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims (10)

1. The utility model provides an encoder, is applied to the motor, its characterized in that, the encoder includes magnetic chip, microcomputer and temperature detect circuit, magnetic chip and temperature detect circuit respectively with the microcomputer is connected, wherein:

the magnetic chip is used for acquiring initial position information of the rotor and sending the initial position information to the microcomputer;

the temperature detection circuit is used for detecting the temperature of the motor and outputting a temperature sensing signal to the microcomputer according to the temperature of the motor;

and the microcomputer is used for obtaining position deviation information based on the initial position information and the target position information, determining the temperature information of the motor according to the temperature sensing signal, and sending the position deviation information and the temperature information to a controller of the motor.

2. The encoder of claim 1, further comprising a first SPI communication interface, the first SPI communication interface being connected to the magnetic chip and the microcomputer, respectively, wherein:

and the first SPI communication interface is used for receiving the initial position information sent by the magnetic chip and sending the initial position information to the microcomputer.

3. The encoder according to claim 1, wherein the positional deviation information includes angular deviation information, the microcomputer includes a central processor and a Flash memory, the central processor being connected to the Flash memory, wherein:

the Flash memory is used for storing the angle deviation information;

and the central processing unit is used for acquiring the angle deviation information from the Flash memory and obtaining actual angle information based on the angle deviation information.

4. The encoder according to claim 1, wherein the temperature detection circuit includes a power source, a first resistor, a second resistor, one end of the first resistor is connected to one end of the second resistor, the other end of the first resistor is connected to the power source, the other end of the second resistor is connected to the microcomputer, wherein:

the power supply is used for supplying power to the temperature detection circuit;

the first resistor is a constant value resistor and is used for dividing the voltage input by the power supply;

the second resistor is used for outputting a first voltage signal according to the internal temperature of the motor;

the microcomputer is used for acquiring the first voltage signal and determining the temperature information of the motor based on the first voltage signal.

5. The encoder of claim 4, wherein the second resistor is a thermistor.

6. The encoder of claim 4, wherein the temperature detection circuit further comprises a filter capacitor, one end of the filter capacitor is connected to the second resistor, and the other end of the filter capacitor is connected to ground, wherein:

the filter capacitor is used for filtering the first voltage signal.

7. An electric machine comprising the encoder of any one of claims 1-6, further comprising a controller, the encoder being connected to the controller, wherein:

the encoder is also used for obtaining actual position information according to the position deviation information and sending the actual position information to the controller;

and the controller is used for receiving the actual position information and the temperature information sent by the encoder and controlling the motor based on the actual position information and the temperature information.

8. The electric machine of claim 7, further comprising a rotor and a stator, the encoder and rotor being located inside the stator, wherein:

the stator is fixed in the motor and used for generating a magnetic field;

the rotor is used for rotating in a magnetic field to realize energy conversion.

9. The electric machine of claim 7, further comprising an alarm device connected to the controller, wherein:

the controller is used for judging whether the temperature of the motor exceeds a preset temperature threshold value or not, and if so, outputting an alarm instruction to the alarm device;

and the alarm device is used for outputting an alarm signal when receiving the alarm instruction.

10. The electric machine of claim 7, comprising magnetic steel located inside the rotor, wherein:

the magnetic steel is used for forming a magnetic field inside the motor together with the stator of the motor;

and the magnetic chip is used for determining the initial position information of the rotor according to the magnetic field position change of the magnetic steel.

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