CN211826208U - Current measuring device for motor control system and motor - Google Patents
Current measuring device for motor control system and motor Download PDFInfo
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- CN211826208U CN211826208U CN201922274540.XU CN201922274540U CN211826208U CN 211826208 U CN211826208 U CN 211826208U CN 201922274540 U CN201922274540 U CN 201922274540U CN 211826208 U CN211826208 U CN 211826208U
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- 238000004804 winding Methods 0.000 claims abstract description 48
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000012937 correction Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 17
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000020169 heat generation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
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- 230000001360 synchronised effect Effects 0.000 description 2
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Abstract
The utility model provides a current measuring device used in a motor control system, wherein the motor is a single-phase, three-phase or multi-phase winding motor, and each phase winding comprises N parallel windings; the current measuring device comprises N current sensors corresponding to each phase winding of the motor, wherein N is more than or equal to 1 and less than N/2, and a single current sensor is used for measuring the current of any branch in N parallel windings; the current measuring device further comprises a signal processing module, the signal processing module is used for processing the signalThe signal processing module is used for receiving the current signal { I detected by the current sensor1，I2，…InAnd calculating to obtain the current I of each phase windingR＝βN(I1+I2+…+In) And/n, wherein beta is a correction coefficient and the total current of the motor. The utility model discloses an among the motor control system has been solved to the scheme, uses the parallelly connected restriction problem of measuring the heavy current of undercurrent measurement component.
Description
Technical Field
The utility model relates to an electrical equipment field, concretely relates to a motor that is arranged in current measurement device of motor control system and disposes this current measurement device.
Background
In many integrated circuits, real-time observation of the current of each powered link is usually required. The measurement of the current is dependent on the current sensor. The current sensors are different in variety according to measurement principles, and can be mainly divided into: shunts, electromagnetic current transformers, electronic current transformers, and the like.
Taking a three-phase permanent magnet synchronous motor as an example, in a three-phase permanent magnet synchronous motor control system, the magnitude of input current (ac/dc) and the output current (ac) of each phase need to be observed simultaneously, so as to ensure the open-close loop control and state monitoring of the motor. In the existing technical scheme, the type of a current sensor is selected according to the current of each circuit, and one sensor corresponds to one circuit to observe. For example: the maximum current for the design of line 1 is 10 amps, then current observation would be a reasonable choice for current sensors using a range of 10 amps or more. In motor control systems, most of the existing solutions use a relatively inexpensive resistance current instead of a current sensor under low current demand, and use a hall current sensor under high current.
Because the working ranges of various current sensor components and the respective advantages and disadvantages are different, under many working conditions, the type selection of the current sensor will restrict the design and development of the control system, such as: cost, volume, weight, heat generation, etc.
For example, a hall sensor is compared with a resistive sensor. When measuring large current, the Hall sensor has the characteristics of low heat generation, large measuring range, high precision and the like. But in the middle and small measuring range links, the resistance sensor can also show the characteristics of low cost, small volume and other commercial convenience.
As shown in fig. 1(a) and (b), when measuring a large current, some designs also adopt a form of connecting multiple groups of resistance-type sensors in parallel, so that a single-phase large current is successfully shunted to each phase of current, thereby satisfying the range requirement of the resistance-type sensors and replacing the hall sensors. However, with this design, the number of sensors is increased, and the cost cannot be reduced excessively. Meanwhile, the difficulty of arranging the wiring of the components is increased due to the distributed sensor layout, so that the overall size is increased.
When the current measurement demand increases, not only is the price high to use hall sensor, and the volume increases a lot than resistance-type sensor simultaneously, but under heavy current, parallelly connected too much resistance-type sensor is because self series circuit, according to P become I ═ I2The R formula indicates that each resistor causes a serious heat generation problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a current measurement device for among motor control system to in solving motor control system, use the parallelly connected restriction problem of measuring the heavy current of undercurrent measurement component.
A first object of the present invention is to provide a current measuring device for use in a motor control system, wherein the motor is a single-phase, three-phase or multi-phase winding motor, and each phase winding includes N parallel windings; the current measuring device comprises N current sensors corresponding to each phase winding of the motor, wherein N is more than or equal to 1 and less than N/2, and a single current sensor is used for measuring the current of any branch in N parallel windings; the current measuring device comprises a signal processing module, wherein the signal processing module is used for receiving a current signal { I ] detected by the current sensor1，I2，…InAnd calculating to obtain the current I of each phase windingR＝βN(I1+I2+…+In) And/n, wherein beta is a correction coefficient and the total current of the motor.
Optionally, the current sensor is a non-contact sensor, including but not limited to a hall sensor.
Optionally, the current sensor is an access current sensor, including but not limited to a resistive current sensor.
Optionally, the motor is a dc motor or an ac motor.
Preferably, the current sensors corresponding to each phase winding of the motor are configured to be n-1.
A second object of the present invention is to provide a motor, the motor is a single-phase, three-phase or multi-phase winding motor, and each phase winding includes N-way windings, the control system of the motor is configured with the current measuring device of the first object of the present invention.
The utility model has the advantages of as follows:
adopt the scheme of the utility model, can replace the current mode that adopts hall sensor or parallelly connected multiunit resistance sensor's form to measure the heavy current, use the parallelly connected heavy current of measuring of undercurrent measuring element in motor control system, reduced current sensor's use cost and use quantity, reduced the loss that is brought by current sensor simultaneously and generated heat, also increased circuit design's possibility on the other hand, made it satisfy the needs of special occasion.
Drawings
Fig. 1 is a schematic diagram of two conventional modes for measuring a large current.
Fig. 2 is a schematic diagram of a conventional measurement scheme and a new architecture scheme for branch current measurement.
Fig. 3 is a schematic diagram of a conventional three-phase motor current measuring method.
Fig. 4 is a schematic diagram of a current measuring method of a three-phase motor according to an embodiment of the present invention.
Detailed Description
For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the claims of the present invention.
To the current measurement mode that traditional parallelly connected multiunit resistance sensor as shown in fig. 2(a) exists need components and parts many, the wiring degree of difficulty is big, generate heat serious scheduling problem, the utility model provides a new framework scheme as shown in fig. 2 (b). On the basis of the original framework, the new scheme is that the current sensors 2-N are removed, the current sensors 1 are reserved, and the magnitude of each branch current is calculated through the relation among the branch currents and based on the measurement result of the branch current 1, so that the magnitude of the total current is calculated.
If the current sensor adopts a non-contact sensor, such as a Hall sensor, under the ideal condition, the architecture of the new scheme can be directly used. However, in practical applications, the branch current is a pure wire, and the uncertainty of the welding point can generate unbalanced distribution of resistance and inductance, thereby affecting the current estimation accuracy. If an access sensor, such as a resistive current sensor, is used, the resistance value of the measurement branch is much larger than the branch current due to the resistance and inductance of the access device, and thus the estimation result is invalid. Therefore, the architecture of the new scheme cannot be directly used for measurement in the circuit regardless of the measurement mode.
In conventional motor control (here, a three-phase star-connected motor winding is taken as an example), as shown in fig. 3, a measurement circuit is directly connected to a winding of a UVW phase of a motor, and a motor winding is the largest resistance and inductive load in the whole circuit, and the magnitude of the resistance and the inductive load is far higher than the resistance value of a resistance sensor or unstable resistance caused by welding points in the circuit.
Thus the parallel nature of the parallel-wound branches of the motor windings in current can be exploited by splitting the parallel-wound windings 1-N in each phase of the UVW into parallel current groups 1-N, with the winding 1 (or more windings) in each phase of the UVW connected to the current sensor. Because the resistance value of the motor winding is far larger than the extra resistance generated by the current sensor, the influence of the resistance value on the current detection can be ignored.
Based on the above principle explanation, the embodiment of the utility model provides a current measurement device for among the motor control system.
As shown in fig. 4, again taking the star connection winding of the three-phase motor as an example, each phase winding of the star connection winding comprises N parallel windings, and parallel current groups 1-N are formed. A current sensor is connected to winding 1 (or more windings N, 1. ltoreq. N < N/2) in each phase of UVW to measure the current in winding 1 (or N windings). Furthermore, the current of each phase of UVW can be deduced from the measured current in winding 1 (or n windings) based on the parallel nature of the parallel winding branches in current. The current of each phase can be specifically calculated by the following formula:
IR＝βN(I1+I2+…+In)/n
where β is the correction factor. When measuring only the current I in the winding 11Time phase current IR＝βNI1。
And then, obtaining the total current according to the measured current of each phase of UVW.
When the measuring framework is adopted, the current sensor can be a non-contact sensor, such as a Hall sensor; or an access current sensor, such as a resistive current sensor.
The motor suitable for the motor can be a single-phase, three-phase or multi-phase winding motor with a parallel winding, and can be a direct current motor or an alternating current motor.
The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (6)
1. A current measuring device for use in a motor control system, the motor being a single phase, three phase or multi-phase winding motor, each phase winding comprising N parallel windings, wherein: the current measuring device comprises N current sensors corresponding to each phase winding of the motor, wherein N is more than or equal to 1 and less than N/2, and a single current sensor is used for measuring the current of any branch in N parallel windings; the current measuring device also comprises a signal processing module which is used for receiving the current signal { I detected by the current sensor1，I2，…InAnd calculating to obtain the current I of each phase windingR＝βN(I1+I2+…+In) And/n, wherein beta is a correction coefficient and the total current of the motor.
2. A current measuring device for use in a motor control system according to claim 1, wherein: the current sensor is a non-contact sensor and comprises a Hall sensor.
3. A current measuring device for use in a motor control system according to claim 1, wherein: the current sensor is an access type current sensor and comprises a resistance type current sensor.
4. A current measuring device for use in a motor control system according to claim 1, wherein: the motor is a direct current motor or an alternating current motor.
5. The current measuring apparatus for use in a motor control system according to any one of claims 1 to 4, wherein: the current sensors corresponding to each phase winding of the motor are configured to be n-1.
6. An electric machine, which is a single-phase, three-phase or multi-phase winding machine, each phase winding comprising N parallel windings, characterized in that the control system of the machine is provided with a current measuring device according to any of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922274540.XU CN211826208U (en) | 2019-12-17 | 2019-12-17 | Current measuring device for motor control system and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922274540.XU CN211826208U (en) | 2019-12-17 | 2019-12-17 | Current measuring device for motor control system and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211826208U true CN211826208U (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922274540.XU Active CN211826208U (en) | 2019-12-17 | 2019-12-17 | Current measuring device for motor control system and motor |
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| CN (1) | CN211826208U (en) |
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- 2019-12-17 CN CN201922274540.XU patent/CN211826208U/en active Active
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20220118 Address after: 310012 No. 23, Xixi villa, Xihu District, Hangzhou City, Zhejiang Province Patentee after: Shi Bowen Address before: 311121 room 406A, building 5, No. 998, Wenyi West Road, Wuchang Street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: Everway (Hangzhou) Technology Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240110 Address after: Li Dashan Incubation Park 452-4, Ningbo Nottingham International Innovation and Entrepreneurship Incubation Industrial Park, No. 199 Taikang East Road, Shounan Street, Yinzhou District, Ningbo City, Zhejiang Province, 315100 Patentee after: Ningbo Nuoyun Drive Technology Co.,Ltd. Address before: 310012 No. 23, Xixi villa, Xihu District, Hangzhou City, Zhejiang Province Patentee before: Shi Bowen |