Parameter measuring device for synchronous motor
By designing a synchronous motor parameter measurement device and utilizing a combination of relays and LCR bridges, the accuracy and speed issues of synchronous motor inductance parameter measurement were solved, thereby improving the accuracy and efficiency of motor performance control.
Patent Information
- Application Number
- CN202423062447.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-11
AI Technical Summary
Existing technologies make it difficult to accurately and quickly measure the Ld and Lq inductance parameters of synchronous motors, which affects the electrical characteristics and performance control of synchronous motors.
A synchronous motor parameter measuring device was designed, including a measuring circuit and an LCR bridge. By setting up measuring circuits composed of different relays, the relays are closed using electrical logic, and the inductance value is measured in combination with a PLC controller and an LCR bridge.
It enables accurate and rapid measurement of the inductance value of synchronous motors, supporting performance optimization such as vector control and current control of synchronous motors.
Smart Images
Figure CN223582099U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to synchronous motor technical field, especially a kind of synchronous motor parameter measuring device. BACKGROUND
[0002] In synchronous motor, Ld and Lq usually refer to the two parameters of direct-axis inductance and quadrature-axis inductance under stator coordinate system, which are important parameters to describe the electrical characteristics of synchronous motor.
[0003] Ld and Lq represent the inductance characteristics of synchronous motor under different magnetic field directions, which directly affect the electrical characteristics and performance of synchronous motor. In the process of controlling synchronous motor, the values of Ld and Lq are of great significance to vector control, current control, position control, etc. SUMMARY
[0004] The utility model discloses a kind of synchronous motor parameter measuring devices to solve the technical problems existing in the background art, and provide a kind of synchronous motor parameter measuring device.
[0005] To achieve the above object, the technical scheme adopted by the utility model is as follows:
[0006] A kind of synchronous motor parameter measuring device, including measured motor, measurement loop and LCR bridge;
[0007] The measurement loop includes dry way one, dry way two, relay K1, relay K2, relay K3, relay K4, relay K5, relay K6 and relay K7;
[0008] The measurement loop is electrically connected with LCR bridge by dry way one and dry way two;
[0009] The main contact of relay K1, the normally closed auxiliary contact of relay K2 are connected in series between dry way one and the first winding U-phase line end of measured motor;
[0010] The main contact of relay K2, the normally closed auxiliary contact of relay K1 are connected in series between dry way two and the first winding U-phase line end of measured motor;
[0011] The main contact of relay K3, the normally closed auxiliary contact of relay K4 are connected in series between dry way one and the first winding V-phase line end of measured motor;
[0012] The main contact of relay K4, the normally closed auxiliary contact of relay K3 are connected in series between dry way two and the first winding V-phase line end of measured motor;
[0013] The main contact of relay K5, the normally closed auxiliary contact of relay K6 are connected in series between dry way one and the first winding W-phase line end of measured motor;
[0014] The main contact of relay K6, the normally closed auxiliary contact of relay K5 are connected in series between the dry circuit two and the first winding W phase line end of the measured motor.
[0015] The main contact of relay K7 is connected between the dry circuit one and the first winding zero line end of the measured motor.
[0016] The technical scheme is further limited by the utility model, and the driving assembly is connected with the measured motor through a shaft coupling.
[0017] The technical scheme is further limited by the utility model, and the driving assembly comprises a servo driver, a servo motor and a speed reducer.
[0018] The technical scheme is further limited by the utility model, and the utility model further comprises a PLC controller and a display.
[0019] The technical scheme is further limited by the utility model, and the measuring circuit is electrically connected with the PLC controller.
[0020] The technical scheme is further limited by the utility model, and the measuring circuit further comprises a relay K8, a relay K9, a relay K10, a relay K11, a relay K12, a relay K13 and a relay K14.
[0021] The main contact of relay K8, the normally closed auxiliary contact of relay K9 are connected in series between the dry circuit one and the second winding U phase line end of the measured motor.
[0022] The main contact of relay K9, the normally closed auxiliary contact of relay K8 are connected in series between the dry circuit two and the second winding U phase line end of the measured motor.
[0023] The main contact of relay K10, the normally closed auxiliary contact of relay K11 are connected in series between the dry circuit one and the second winding V phase line end of the measured motor.
[0024] The main contact of relay K11, the normally closed auxiliary contact of relay K10 are connected in series between the dry circuit two and the second winding V phase line end of the measured motor.
[0025] The main contact of relay K12, the normally closed auxiliary contact of relay K13 are connected in series between the dry circuit one and the second winding W phase line end of the measured motor.
[0026] The main contact of relay K13 and the normally closed auxiliary contact of relay K12 are connected in series between the dry circuit II and the second winding phase line end of the measured motor.
[0027] The main contact of relay K14 is connected between the dry circuit I and the second winding zero line end of the measured motor.
[0028] Compared with the prior art, the utility model has the following technical effects:
[0029] The utility model discloses a measurement circuit formed by different relays, and the different relays are closed through electrical logic, and then the LCR bridge measures the inductance value of the third phase under the condition of phase, line and two-phase short circuit, so that the inductance value is measured accurately and quickly.
[0030] The utility model is further described below in combination with the drawings and embodiments. DRAWINGS
[0031] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the premise of the drawings.
[0032] Figure 1 It is the structure connection relation diagram of the utility model;
[0033] Figure 2 It is the connection relation diagram between the phase line end and the zero line end of the measured motor, the measurement circuit and the LCR bridge in the utility model.
[0034] The drawings show that: 1, servo driver;2, servo motor;3, speed reducer;4, coupling;5, measured motor;6, PLC controller;7, LCR bridge;8, measurement circuit;9, display. DETAILED DESCRIPTION
[0035] In order to make the above purpose, features and advantages of the utility model more apparent and easy to understand, the specific implementation of the utility model is described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. But the utility model can be implemented in many other ways different from the description, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.
[0036] In the description of the utility model, it is understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature.
[0037] In the embodiments of the utility model, unless otherwise specified and limited, the terms "connected", "connected" and other terms should be broadly understood, for example, it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.
[0038] As shown in Figure 1 and 2 The utility model discloses a synchronous motor parameter measuring device, mainly by servo driver 1, servo motor 2, speed reducer 3, shaft coupling 4, measured motor 5, PLC controller 6, LCR bridge 7, measuring circuit 8, display 9 etc.
[0039] PLC controller 6 and servo driver 1 are in communication connection, and PLC controller 6 can control the work of servo driver 1. It should be noted that the algorithm or program involved in the control process between PLC controller 6 and servo driver 1 is prior art, and does not belong to the protection scope of the utility model, and is only used for the understanding of the connection relationship between servo driver 1 and servo driver 1 by the person skilled in the art.
[0040] The input end of servo driver 1 is electrically connected with three-phase ac power supply. The output end of servo driver 1 is electrically connected with the input end of servo motor 2, and servo motor 2 receives the electric signal of servo driver 1, so that servo motor 2 works, and the servo driver 1 drives the servo motor 2 to work, which is prior art.
[0041] The output end of servo motor 2 is connected with speed reducer 3, and speed reducer 3 is connected with measured motor 5 through shaft coupling 4. Servo motor 2 drives measured motor 5 to work through the action of speed reducer 3 and shaft coupling 4, and then the LCR bridge 7 and measuring circuit 8 measure the parameters of the working measured motor 5.
[0042] LCR bridge 7: is an instrument for measuring inductance (L), capacitance (C) and resistance (R) parameters, and is prior art, and the specific connection relationship of the LCR bridge 7 is not described in detail in the embodiment. The PLC controller 6 is in communication connection with the LCR bridge 7, and specifically: the LCR bridge 7 has a 485 communication port that can meet the measurement real-time data that can be read by the PLC controller 6. It should be noted that the communication connection between the PLC controller 6 and the LCR bridge 7 involves programs that are prior art and do not belong to the protection scope of the utility model, and are only used for the understanding of the connection relationship between the PLC controller 6 and the LCR bridge 7 by the person skilled in the art.
[0043] PLC controller 6: is a programmable logic controller, which is prior art, and is a digital operation device of the device, used for monitoring the inductance measurement value of the measurement process, servo position operation, logic control of the measurement loop 8, data processing and device protection. It should be noted that in the embodiment, the algorithms and programs involved in the process of the PLC controller 6 controlling other devices are prior art and do not belong to the protection scope of the utility model, and are only used for the understanding of the application of the PLC controller 6 by the person skilled in the art.
[0044] Display 9: used for information interaction and operation of human-computer interface. The PLC controller 6 is in communication connection with the display 9, so as to display corresponding information. It should be noted that the programs or algorithms involved in the process of the display 9 displaying information or operating interaction are prior art and do not belong to the protection scope of the utility model, and are only used for the understanding of the application of the display 9 by the person skilled in the art.
[0045] Measurement loop 8: composed of a relay group, an electrical circuit, respectively measuring each phase, line, two-phase short-circuit inductance value of the third phase through electrical logic action. Specifically composed of dry line one, dry line two, relay K1, relay K2, relay K3, relay K4, relay K5, relay K6 and relay K7, relay K8, relay K9, relay K10, relay K11, relay K12, relay K13 and relay K14, etc. It should be noted that the measurement loop 8 of the embodiment is provided with N branches, which are used for parameter measurement of a plurality of windings of different measured motors 5.
[0046] The measurement loop 8 is electrically connected with the LCR bridge 7 through the dry line one and the dry line two.
[0047] The main contact of relay K1, the normally closed auxiliary contact of relay K2 are connected in series between the dry circuit one and the first winding U phase line end (i.e. 1U end) of the measured motor 5; the main contact of relay K2, the normally closed auxiliary contact of relay K1 are connected in series between the dry circuit two and the first winding U phase line end (i.e. 1U end) of the measured motor 5; the main contact of relay K3, the normally closed auxiliary contact of relay K4 are connected in series between the dry circuit one and the first winding V phase line end (i.e. 1V end) of the measured motor 5; the main contact of relay K4, the normally closed auxiliary contact of relay K3 are connected in series between the dry circuit two and the first winding V phase line end (i.e. 1V end) of the measured motor 5; the main contact of relay K5, the normally closed auxiliary contact of relay K6 are connected in series between the dry circuit one and the first winding W phase line end (i.e. 1W end) of the measured motor 5; the main contact of relay K6, the normally closed auxiliary contact of relay K5 are connected in series between the dry circuit two and the first winding W phase line end (i.e. 1W end) of the measured motor 5; the main contact of relay K7 is connected between the dry circuit one and the first winding zero line end (i.e. 1N end) of the measured motor 5. The main contact of relay K8, the normally closed auxiliary contact of relay K9 are connected in series between the dry circuit one and the second winding U phase line end (i.e. 2U end) of the measured motor 5; the main contact of relay K9, the normally closed auxiliary contact of relay K8 are connected in series between the dry circuit two and the second winding U phase line end (i.e. 2U end) of the measured motor 5; the main contact of relay K10, the normally closed auxiliary contact of relay K11 are connected in series between the dry circuit one and the second winding V phase line end (i.e. 2V end) of the measured motor 5; the main contact of relay K11, the normally closed auxiliary contact of relay K10 are connected in series between the dry circuit two and the second winding V phase line end (i.e. 2V end) of the measured motor 5; the main contact of relay K12, the normally closed auxiliary contact of relay K13 are connected in series between the dry circuit one and the second winding W phase line end (i.e. 2W end) of the measured motor 5; the main contact of relay K13, the normally closed auxiliary contact of relay K12 are connected in series between the dry circuit two and the second winding W phase line end (i.e. 2W end) of the measured motor 5; the main contact of relay K14 is connected between the dry circuit one and the second winding zero line end (i.e. 2N end) of the measured motor 5.
[0048] The PLC controller 6 respectively closes different relays according to the electrical logic of Table 1, and communicates to read the LCR bridge 7 to measure the inductance value of the phase, line, two-phase short circuit to the third phase, until all processes are completed.
[0049] Table 1:
[0050]
[0051]
[0052] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Any person skilled in the art, without departing from the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application, or modify it into equivalent embodiments with equivalent changes. Therefore, any equivalent changes made according to the shape, structure and principle of the present application, without departing from the technical scheme of the present application, should be covered within the protection scope of the present application.
Claims
1. A synchronous machine parameter measuring device, characterized by The measuring circuit comprises a dry circuit one, a dry circuit two, a relay K1, a relay K2, a relay K3, a relay K4, a relay K5, a relay K6 and a relay K7. The measuring circuit comprises a dry circuit one, a dry circuit two, a relay K1, a relay K2, a relay K3, a relay K4, a relay K5, a relay K6 and a relay K7. The measuring circuit is electrically connected with the LCR bridge through the dry circuit one and the dry circuit two. The main contact of the relay K1 and the normally closed auxiliary contact of the relay K2 are connected in series between the dry circuit one and the U-phase line end of the first winding of the motor to be measured. The main contact of the relay K2 and the normally closed auxiliary contact of the relay K1 are connected in series between the dry circuit two and the U-phase line end of the first winding of the motor to be measured. The main contact of the relay K3 and the normally closed auxiliary contact of the relay K4 are connected in series between the dry circuit one and the V-phase line end of the first winding of the motor to be measured. The main contact of the relay K4 and the normally closed auxiliary contact of the relay K3 are connected in series between the dry circuit two and the V-phase line end of the first winding of the motor to be measured. The main contact of the relay K5 and the normally closed auxiliary contact of the relay K6 are connected in series between the dry circuit one and the W-phase line end of the first winding of the motor to be measured. The main contact of the relay K6 and the normally closed auxiliary contact of the relay K5 are connected in series between the dry circuit two and the W-phase line end of the first winding of the motor to be measured. The main contact of the relay K7 is connected between the dry circuit one and the zero line end of the first winding of the motor to be measured.
2. A synchronous machine parameter measuring device as claimed in claim 1, characterized in that The driving assembly is connected with the motor to be measured through a shaft coupling.
3. A synchronous machine parameter measuring device as claimed in claim 2, characterized in that The driving assembly comprises a servo driver, a servo motor and a speed reducer.
4. A synchronous machine parameter measuring device as claimed in claim 3, characterized in that The input end of the servo driver is electrically connected with a three-phase alternating current power supply.
5. A synchronous machine parameter measuring device as claimed in claim 4, characterized in that The output end of the servo driver is electrically connected with the input end of the servo motor.
6. A synchronous machine parameter measuring device as claimed in claim 1, characterized in that The output end of the servo motor is connected with the speed reducer. The speed reducer is connected with the motor to be measured through a shaft coupling. The PLC controller is in communication connection with the LCR bridge. The PLC controller is in communication connection with the display. The PLC controller is in communication connection with the servo driver. The measuring circuit is electrically connected with the PLC controller. The measuring circuit further comprises a relay K8, a relay K9, a relay K10, a relay K11, a relay K12, a relay K13 and a relay K14. The main contact of the relay K8 and the normally closed auxiliary contact of the relay K9 are connected in series between the dry circuit one and the U-phase line end of the second winding of the motor to be measured. The main contact of the relay K9 and the normally closed auxiliary contact of the relay K8 are connected in series between the dry circuit two and the U-phase line end of the second winding of the motor to be measured. The main contact of the relay K10 and the normally closed auxiliary contact of the relay K11 are connected in series between the dry circuit one and the V-phase line end of the second winding of the motor to be measured. The main contact of the relay K11 and the normally closed auxiliary contact of the relay K10 are connected in series between the dry circuit two and the V-phase line end of the second winding of the motor to be measured. The main contact of the relay K12 and the normally closed auxiliary contact of the relay K13 are connected in series between the dry circuit one and the W-phase line end of the second winding of the motor to be measured. The main contact of the relay K13 and the normally closed auxiliary contact of the relay K12 are connected in series between the dry circuit two and the W-phase line end of the second winding of the motor to be measured. The main contact of a relay K14 is connected between the said first branch and the zero line end of the second winding of the motor under test.