CN117318552A - Motor rotation speed determining system - Google Patents

Motor rotation speed determining system Download PDF

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Publication number
CN117318552A
CN117318552A CN202311265285.7A CN202311265285A CN117318552A CN 117318552 A CN117318552 A CN 117318552A CN 202311265285 A CN202311265285 A CN 202311265285A CN 117318552 A CN117318552 A CN 117318552A
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CN
China
Prior art keywords
signal
motor
orthogonal
control module
rotation speed
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Pending
Application number
CN202311265285.7A
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Chinese (zh)
Inventor
请求不公布姓名
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Chengdu Aich Technology Co Ltd
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Chengdu Aich Technology Co Ltd
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Application filed by Chengdu Aich Technology Co Ltd filed Critical Chengdu Aich Technology Co Ltd
Priority to CN202311265285.7A priority Critical patent/CN117318552A/en
Publication of CN117318552A publication Critical patent/CN117318552A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation

Abstract

The invention discloses a motor rotating speed determining system, and relates to the technical field of electronics. The motor rotation speed determination system includes: the system comprises a micro control module, a control circuit, a current sensor, a quadrature encoder and a permanent magnet synchronous motor; the orthogonal encoder outputs an orthogonal signal and an index signal along with the rotation of the permanent magnet synchronous motor, the micro control module determines the motor rotation speed based on the orthogonal signal and the index signal, and controls the rotation speed of the permanent magnet synchronous motor through the control circuit based on the motor rotation speed and the current signal transmitted by the current sensor, so that the motor with high and low speed change can be accurately measured, and a more accurate and easy-to-implement rotation speed determination process is realized.

Description

Motor rotation speed determining system
Technical Field
The invention relates to the technical field of electronics, in particular to a motor rotation speed determining system.
Background
With the continuous development of control theory and the characteristics of small volume, high power density, long service life, high efficiency, high response speed and the like of the permanent magnet synchronous motor, the permanent magnet synchronous motor is widely applied to the fields of electric automobiles, household appliances, aerospace and the like.
In the existing application scene of the permanent magnet synchronous motor, the motor rotating speed needs to be measured, and the motor rotating speed detection comprises the methods of sensor detection, sensorless algorithm detection and the like, and is generally complex, large in calculated amount and incapable of being used for accurately measuring the high-speed and low-speed changing electrodes.
Disclosure of Invention
The invention aims to provide a motor rotating speed determining system which is used for solving the problems of motor performance reduction and lower motor operation efficiency caused by inaccurate current motor parameter measurement.
The invention provides a motor rotation speed determining system, which comprises:
the system comprises a micro control module, a control circuit, a current sensor, a quadrature encoder and a permanent magnet synchronous motor;
the micro control module is respectively connected with one end of the control circuit, one end of the current sensor and one end of the orthogonal encoder; the permanent magnet synchronous motor is respectively connected with the other end of the control circuit, the other end of the current sensor and the other end of the orthogonal encoder;
the micro control module determines the motor rotation speed based on the orthogonal signal and the index signal, combines the current signal transmitted by the current sensor based on the motor rotation speed, and completes the control of the permanent magnet synchronous motor rotation speed through the control circuit.
Under the condition of adopting the technical scheme, the motor rotation speed determining system provided by the embodiment of the application comprises: the system comprises a micro control module, a control circuit, a current sensor, a quadrature encoder and a permanent magnet synchronous motor; the micro control module is respectively connected with one end of the control circuit, one end of the current sensor and one end of the orthogonal encoder; the permanent magnet synchronous motor is respectively connected with the other end of the control circuit, the other end of the current sensor and the other end of the orthogonal encoder; the orthogonal encoder outputs an orthogonal signal and an index signal along with the rotation of the permanent magnet synchronous motor, the micro control module determines the motor rotation speed based on the orthogonal signal and the index signal, and controls the rotation speed of the permanent magnet synchronous motor through the control circuit based on the motor rotation speed and the current signal transmitted by the current sensor, so that the motor with high and low speed change can be accurately measured, and a more accurate and easy-to-implement rotation speed determination process is realized.
In one possible implementation, the orthogonal encoder includes an orthogonal decoding unit, a time counting unit, a position counting unit, and a watchdog unit that are connected to each other.
In one possible implementation, the quadrature decoding unit is configured to output the quadrature signal and the index signal along with rotation of the permanent magnet synchronous motor.
In one possible implementation manner, the time counting unit is configured to generate an interrupt event every second preset time interval, latch an edge count value of the quadrature signal captured by the quadrature decoding unit, and control the edge count value to start counting from 0.
In one possible implementation, the micro-control module determines a motor speed based on the edge count value.
In one possible implementation, the position counting unit is configured to determine a total number of edges of the orthogonal signal by the orthogonal decoding unit.
In a possible implementation manner, the watchdog unit is configured to start timing when a first edge corresponding to the orthogonal signal is detected when the edge signal corresponding to the orthogonal signal is not acquired at intervals of the second preset duration, and determine, in combination with the micro control module, that the motor rotation speed is 0 and generate an abnormal signal when a second edge corresponding to the orthogonal signal is not detected after the intervals of the first preset duration.
In a possible implementation manner, when the edge signal corresponding to the orthogonal signal is not obtained by the watchdog unit at intervals of the second preset duration, starting timing when a first edge corresponding to the orthogonal signal is detected, and when a second edge corresponding to the orthogonal signal is detected after the first preset duration is also detected, replacing the speed corresponding to the second preset duration with the speed calculated by the second preset duration last time, and determining the motor rotation speed based on the first preset duration by combining the micro control module after reaching a time interval of the first preset duration;
the first preset time period is longer than the second preset time period.
In one possible implementation, the micro-control module is further configured to: and under the condition that the abnormal signal is matched with the preset abnormal signal, carrying out power-off operation on the motor by starting a protection program.
In one possible implementation, the system further includes a display module coupled to the micro-control module.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 shows a schematic structural diagram of a motor rotation speed determining system according to an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of an orthogonal encoder according to an embodiment of the present application;
fig. 3 is a schematic diagram of a quadrature signal, a first preset duration, and a second preset duration according to an embodiment of the present application.
Detailed Description
In order to clearly describe the technical solution of the embodiments of the present invention, in the embodiments of the present invention, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. For example, the first threshold and the second threshold are merely for distinguishing between different thresholds, and are not limited in order. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.
In the present invention, the words "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
In the present invention, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, a and b, a and c, b and c, or a, b and c, wherein a, b, c can be single or multiple.
Fig. 1 shows a schematic structural diagram of a motor rotation speed determining system according to an embodiment of the present application, as shown in fig. 1, the motor rotation speed determining system includes:
the micro-control module 10, the control circuit 20, the current sensor 30, the quadrature encoder 40 and the permanent magnet synchronous motor 50;
the micro control module 10 is connected with one end of the control circuit 20, one end of the current sensor 30 and one end of the quadrature encoder 40, respectively; the permanent magnet synchronous motor 50 is respectively connected with the other end of the control circuit 20, the other end of the current sensor 30 and the other end of the quadrature encoder 40;
the quadrature encoder 40 outputs a quadrature signal and an index signal along with the rotation of the permanent magnet synchronous motor 50, the micro control module 10 determines the motor rotation speed based on the quadrature signal and the index signal, and controls the rotation speed of the permanent magnet synchronous motor through the control circuit based on the motor rotation speed combined with the current signal transmitted by the current sensor.
In summary, the motor rotation speed determining system provided in the embodiment of the present application includes: the system comprises a micro control module, a control circuit, a current sensor, a quadrature encoder and a permanent magnet synchronous motor; the micro control module is respectively connected with one end of the control circuit, one end of the current sensor and one end of the orthogonal encoder; the permanent magnet synchronous motor is respectively connected with the other end of the control circuit, the other end of the current sensor and the other end of the orthogonal encoder; the orthogonal encoder outputs an orthogonal signal and an index signal along with the rotation of the permanent magnet synchronous motor, the micro control module determines the motor rotation speed based on the orthogonal signal and the index signal, and controls the rotation speed of the permanent magnet synchronous motor through the control circuit based on the motor rotation speed and the current signal transmitted by the current sensor, so that the motor with high and low speed change can be accurately measured, and a more accurate and easy-to-implement rotation speed determination process is realized.
Fig. 2 shows a schematic structural diagram of an orthogonal encoder according to an embodiment of the present application, and as shown in fig. 2, the orthogonal encoder 40 includes an orthogonal decoding unit 401, a time counting unit 402, a position counting unit 403, and a watchdog unit 404 that are connected to each other.
The quadrature decoding unit is used for outputting the quadrature signal and the index signal along with rotation of the permanent magnet synchronous motor.
In this application, fig. 3 shows a schematic diagram of one quadrature signal, a first preset duration (T1), and a second preset duration (T2) provided in the embodiment of the present application, and as shown in fig. 3, shows a quadrature signal A, B output by an encoder when a motor rotates one revolution.
Optionally, the time counting unit is configured to generate an interrupt event every second preset time interval, latch an edge count value of the quadrature signal captured by the quadrature decoding unit, and control the edge count value to start counting from 0.
Optionally, the micro-control module determines the motor speed based on the edge count value.
In the present application, determining the motor rotation speed based on the latched edge count value is accomplished by the formula (1):
v＝POS_CNT*360/(T2*N) (1)；
wherein v represents the motor speed; pos_cnt represents the edge count value of the latch; t2 represents the second preset time period; n represents the total number of edges corresponding to the quadrature signals output by the encoder when the motor rotates one circle.
Optionally, the position counting unit is configured to determine a total number of edges of the orthogonal signal by the orthogonal decoding unit.
Optionally, the watchdog unit is configured to start timing when a first edge corresponding to the orthogonal signal is detected when the edge signal corresponding to the orthogonal signal is not acquired at the second preset time interval, and determine, in combination with the micro control module, that the motor rotation speed is 0 and generate an abnormal signal when a second edge corresponding to the orthogonal signal is not detected after the first preset time interval.
Optionally, the watchdog unit is configured to start timing when a first edge corresponding to the orthogonal signal is detected when the edge signal corresponding to the orthogonal signal is not acquired at the second preset time interval, and determine, by combining the micro control module, the motor rotation speed based on the first preset time interval after reaching the time interval of the first preset time interval, when the second edge corresponding to the orthogonal signal is detected after the first preset time interval, by replacing the speed corresponding to the second preset time interval with the speed calculated by the second preset time interval.
Wherein, referring to fig. 3, the first preset time period (T1) is greater than the second preset time period (T2).
In the present application, determining the motor rotation speed based on the first preset time period is completed by the formula (2):
v＝POS_CNT2/(T1*N) (2)；
wherein v represents the motor speed; t1 represents the first preset duration, and the size of the first preset duration is an integer multiple of T2; n represents the total number of edges corresponding to the orthogonal signals output by the encoder when the motor rotates for one circle; pos_cnt2 represents the latched edge count value of the T1.
Optionally, the micro control module is further configured to: and under the condition that the abnormal signal is matched with the preset abnormal signal, carrying out power-off operation on the motor by starting a protection program.
Optionally, referring to fig. 1, the system further includes a display module 60 connected to the micro-control module 10, where the display module 60 is configured to display the rotational speed of the permanent magnet synchronous motor 50 and related control parameters.
In summary, the motor rotation speed determining system provided in the embodiment of the present application includes: the system comprises a micro control module, a control circuit, a current sensor, a quadrature encoder and a permanent magnet synchronous motor; the micro control module is respectively connected with one end of the control circuit, one end of the current sensor and one end of the orthogonal encoder; the permanent magnet synchronous motor is respectively connected with the other end of the control circuit, the other end of the current sensor and the other end of the orthogonal encoder; the orthogonal encoder outputs an orthogonal signal and an index signal along with the rotation of the permanent magnet synchronous motor, the micro control module determines the motor rotation speed based on the orthogonal signal and the index signal, and controls the rotation speed of the permanent magnet synchronous motor through the control circuit based on the motor rotation speed and the current signal transmitted by the current sensor, so that the motor with high and low speed change can be accurately measured, and a more accurate and easy-to-implement rotation speed determination process is realized.
Although the invention is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Although the invention has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are merely exemplary illustrations of the present invention as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A motor speed determination system, the system comprising:
the system comprises a micro control module, a control circuit, a current sensor, a quadrature encoder and a permanent magnet synchronous motor;
the micro control module is respectively connected with one end of the control circuit, one end of the current sensor and one end of the orthogonal encoder; the permanent magnet synchronous motor is respectively connected with the other end of the control circuit, the other end of the current sensor and the other end of the orthogonal encoder;
the micro control module determines the motor rotation speed based on the orthogonal signal and the index signal, combines the current signal transmitted by the current sensor based on the motor rotation speed, and completes the control of the permanent magnet synchronous motor rotation speed through the control circuit.
2. The motor speed determination system of claim 1, wherein the quadrature encoder comprises a quadrature decoding unit, a time counting unit, a position counting unit, and a watchdog unit connected to each other.
3. The motor rotation speed determination system according to claim 2, wherein the quadrature decoding unit is configured to output the quadrature signal and the index signal in accordance with rotation of the permanent magnet synchronous motor.
4. The motor speed determination system according to claim 3, wherein the time counting unit is configured to generate an interrupt event every second preset time interval, latch an edge count value of the quadrature signal captured by the quadrature decoding unit, and control the edge count value to count from 0.
5. The motor speed determination system of claim 4, wherein the micro-control module determines motor speed based on the edge count value.
6. The motor speed determination system according to claim 2, wherein the position counting unit is configured to determine a total number of edges of the quadrature signal by the quadrature decoding unit.
7. The motor speed determining system according to claim 4, wherein the watchdog unit is configured to, when the edge signal corresponding to the orthogonal signal is not obtained at intervals of the second preset duration, start timing when a first edge corresponding to the orthogonal signal is detected, and, when a second edge corresponding to the orthogonal signal is not detected after the intervals of the first preset duration, determine that the motor speed is 0 in combination with the micro control module, and generate an abnormal signal;
the first preset time period is longer than the second preset time period.
8. The motor speed determination system according to claim 4, wherein the watchdog unit is configured to start timing when the edge signal corresponding to the orthogonal signal is not acquired at intervals of the second preset duration, start timing when a first edge corresponding to the orthogonal signal is detected, and replace a speed corresponding to the second preset duration with a speed calculated by the second preset duration last time when a second edge corresponding to the orthogonal signal is detected after the intervals of the first preset duration, and then determine the motor speed based on the first preset duration in combination with the micro control module after a time interval of the first preset duration is reached.
9. The motor speed determination system of claim 7, wherein the micro-control module is further configured to: and under the condition that the abnormal signal is matched with the preset abnormal signal, carrying out power-off operation on the motor by starting a protection program.
10. The motor speed determination system according to any one of claims 1-9, further comprising a display module coupled to the micro-control module.
CN202311265285.7A 2023-09-26 2023-09-26 Motor rotation speed determining system Pending CN117318552A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311265285.7A CN117318552A (en) 2023-09-26 2023-09-26 Motor rotation speed determining system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311265285.7A CN117318552A (en) 2023-09-26 2023-09-26 Motor rotation speed determining system

Publications (1)

Publication Number Publication Date
CN117318552A true CN117318552A (en) 2023-12-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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