CN101783648B - Gear position identifying device and identifying method thereof for multi-speed motor - Google Patents
Gear position identifying device and identifying method thereof for multi-speed motor Download PDFInfo
- Publication number
- CN101783648B CN101783648B CN2009102169140A CN200910216914A CN101783648B CN 101783648 B CN101783648 B CN 101783648B CN 2009102169140 A CN2009102169140 A CN 2009102169140A CN 200910216914 A CN200910216914 A CN 200910216914A CN 101783648 B CN101783648 B CN 101783648B
- Authority
- CN
- China
- Prior art keywords
- current
- speed motor
- speed
- many grades
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention relates to a gear position identifying device and an identifying method thereof for a multi-speed motor, and the identifying method comprises the following steps: collecting neutral line current of the multi-speed motor through a current sensor, and obtaining an alternating current signal which is proportional to the neutral line current of the multi-speed motor; then rectifying the alternating current signal to a direct current signal through a rectifier circuit; then accessing the direct current signal into an I/V converting circuit, converting the direct current signal to a voltage signal through the converting circuit; and finally accessing the obtained voltage signal into an MCU core module for carrying out state judgment through a built-in identifying program. The identifying method can identify and determine the running state of the multi-speed motor only by collecting the neutral line current of the multi-speed motor and then comparing the current equivalent threshold of the known fixed gear position with the real-time collected value I. The identifying device only needs to be connected with a neutral line of the multi-speed motor, has the advantages of high safety, simple structure, low cost, high identification precision, convenient maintenance, repair and debugging, and can reduce the engineering construction difficulty and be conductive to popularizing the device.
Description
Technical field
The present invention relates to a kind of multi-speed motor gear recognition device and recognition methods thereof, be applied to the detection of totally zero many grades of fast multiwinding machines, for example the running status of many grades of fast fan coils of central air-conditioning detects.
Background technology
In in the past 50 years, country has issued and implemented tens of energy saving policies, design specification, energy conservation standard, played very big positive role for promoting building energy conservation, but owing to imperfection such as related hardware auxiliary facilities such as data acquisitions, can't carry out highly effective measuring and calculating to the actual conditions and the implementation effect of policy execution, assessment and supervision, under the situation that the state of energy for building is difficult to obtain, it is difficult to carry out building energy-saving renovation, not only restricted control and the implementation capacity of country to building energy conservation, also the raising to China's building energy conservation integral level has caused adverse influence.For this reason, to the state recognition of industrial multi-speed motor gear and the central air-conditioning fan coil prerequisite that is absolutely necessary, in the state-detection of energy consumption measurement or metering and billing foundation and implement to play crucial effects aspect the supervision.
At present, many gears of current detection type motor status recognition technology can realize state-detection, centralized monitor and information-based processing of many grades of speed motors or central air-conditioning fan coil running status, but the place of this technical deficiency is: need detect each gear line of motor, with the third gear speed motor is example, need to gather the current signal of high, medium and low shelves, the circuit relative complex, cost is higher; Owing to need gather each grade electric current, a third gear speed motor just needs nearly 11 lines (comprising that seven are gathered line, two order wires, two power lines), and construction cost is higher; The collection port is more, and the interface that makes device need is more, has reduced the integrated level of device.
Many gears motor status recognition technology of voltage detecting type is to utilize the electric moter voltage mutual inductance technology, compare by low-grade voltage and on-the-spot alternating voltage, obtain the state of motor operation, solved the difficulty of engineering wiring, reduce difficulty of construction, but this technology exists following deficiency equally: this method and apparatus is only by making photoisolator be operated in the output current that the range of linearity obtains motor different operating state, thereby judgement motor operating state, the reliability deficiency, too rely on photoelectric isolating device, make accuracy of detection lower; The direct line attachment plate of certain gear voltage and live wire threatens workmen's construction safety, simultaneously also the fail safe and the reliability of reducing apparatus; Voltage sampling might have influence on the operate as normal of motor in motor gear; For the artificial destruction of device or certain detection means of damage shortage naturally and management means.
Therefore, design a kind of multi-speed motor gear recognition device and recognition methods thereof more advanced, easy to use, simple in structure, that reliability and security is strong and seem particularly important.
Summary of the invention
Primary technical problem to be solved by this invention is, the present invention is directed to the prior art deficiency, and a kind of multi-speed motor gear recognition device is provided, and reaches effect safe in utilization, easy for installation.
The primary technical problem that the present invention will solve realizes by the following technical solutions:
A kind of multi-speed motor gear recognition device, current acquisition module 108 is gathered the neutral line current 101 of many grades of speed motors in real time, the current signal that collects is through signal condition, insert the AD modular converter 105 of single-chip microcomputer in the MCU nucleus module 107, the running status and the gear of many grades of speed motors are judged and discerned to MCU nucleus module 107 built-in recognizers 106; Multi-speed motor gear recognition device 114 is connected in series with the zero line 119 of many grades of speed motors 115.
Valve control/detection module 110 is realized the strong and weak electricity isolation by relay, and this relay input connects the I/O output interface of single-chip microcomputer in the MCU nucleus module 107.
Described current acquisition module 108 is one at least, after each realizes current/voltage-converted by the signal of current acquisition module 108 outputs through signal conditioning circuit 109, the AD modular converter 105 that connects single-chip microcomputer in the MCU nucleus module 107 respectively, for recognizer 106 provides real time data, realize the identification and the control of a plurality of multi-speed motor gear states.
When described current sensor 102 adopted non-contact current sensor, the zero line 119 of many grades of speed motors 115 penetrated the empty circles of current sensor 102; Perhaps, when current sensor 102 adopted the contact current sensor, an end interface of current sensor 102 inserted the zero line 119 of many grades of speed motors 115, and other end interface inserts the on-the-spot zero line that exchanges.
Second technical problem to be solved by this invention is that the deficiency at prior art exists provides a kind of recognition methods of adopting above-mentioned multi-speed motor gear recognition device, can realize the range state identification of many grades of speed motors reliably, accurately.
Second technical problem to be solved by this invention is achieved by the following technical solution:
A kind of recognition methods of adopting above-mentioned multi-speed motor gear recognition device, by the neutral line current 101 of gathering many grades of speed motors, the electric current equivalence threshold value of gathering numerical value I and known fixed gear is in real time compared, discern the running status and the gear of many grades of speed motors 115.
Gather the neutral line current 101 of many grades of speed motors by current acquisition module 108, the ac current signal 116 that obtains is a dc current signal 117 by rectification circuit 103 rectifications, dc current signal 117 inserts I/V translation circuit 104 and is transformed to voltage signal 118, voltage signal 118 inserts MCU nucleus module 107, by the 106 pairs of judgements of gathering numerical value I in real time of recognizer that are built in MCU nucleus module 107, the running status and the gear of many grades of speed motors of identification.
The neutral line current 101 of many grades of speed motors is analog signalses, neutral line current 101 proportion relation of dc current signal 117 and voltage signal 118 and many grades of speed motors.
Compared with prior art, beneficial effect of the present invention is:
1. the present invention proposes a kind of recognition device of rapid, reliable multi-speed motor gear running status, only needs to connect the motor zero line, and is simple in structure, with low cost; The accuracy of identification height; Maintenance, repair, debugging conveniently reduce the engineering construction difficulty, improve product competitiveness, save social resources, help the popularization of device.Adopt the recognition methods of this device, utilize the motor gear difference and the drive current difference, by the equivalent threshold ratio of the electric current of gathering the motor neutral line current and presetting, obtain the operational taps of current many grades of speed motors.
2. the current acquisition circuit among the present invention is compared with general Acquisition Circuit, have characteristics such as simple in structure, practical, stable performance, current sensor can adopt the non-contact type current instrument transformer, making recognition device is zero to the influence of machine operation, further improves the fail safe and the reliability of device.
3. current detection circuit is simple and reliable, can realize the collection of multichannel motor status, helps the integrated of device, can realize that the running status of many grades of speed motors of greater number detects and relevant device control, reduces application cost.
Description of drawings
Fig. 1 is many gears of the present invention motor gear recognition device module diagram;
Fig. 2 is many gears of the present invention motor gear recognition device program principle block diagram;
Fig. 3 is a multi-speed motor gear recognition device scheme of installation of the present invention;
Fig. 4 is a multi-speed motor gear recognition methods theory diagram of the present invention.
Reference numeral:
101. the neutral line current of many grades of speed motors, 102. current sensors, 103. rectification circuits,
104.I/V translation circuit, the 105.AD modular converter, 106. recognizers,
107.MCU nucleus module, 108. current acquisition modules, 109. signal conditioning circuits,
110. valve control/detection module, 111. communication modules, 112. memory modules,
113. power module, 114. multi-speed motor gear recognition devices, more than 115. grade of speed motor,
116. ac current signal, 117. dc current signals, 118. voltage signals, 119. zero lines
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is elaborated.
Embodiment
Referring to Fig. 1, a kind of multi-speed motor gear recognition device contains power module 113 and MCU nucleus module 107, and described MCU nucleus module 107 contains microcontroller system circuit; Current acquisition module 108 is gathered the neutral line current 101 of many grades of speed motors in real time, the AD modular converter 105 of the current signal that collects single-chip microcomputer in conditioning access MCU nucleus module 107, the running status and the gear of many grades of speed motors are judged and discerned to the recognizer 106 of described MCU nucleus module 107 built-in multi-speed motor gears.
The multi-speed motor gear recognition device comprises valve control/detection module 110, valve control/detection module 110 is realized the strong and weak electricity isolation by relay, realize the controlled function of valve, this relay input connects the I/O output interface of single-chip microcomputer in the MCU nucleus module 107.
The multi-speed motor gear recognition device can be realized the state acquisition of many motors by the current acquisition module 108 of multichannel, the signal that each current acquisition module 108 is gathered is through connecting the AD modular converter of single-chip microcomputer in the MCU nucleus module 107 respectively behind the signal conditioning circuit 109, for the recognizer 106 of multi-speed motor gear provides real time data, with the identification and the control of the range state of realizing a plurality of many grades of speed motors.
Referring to Fig. 2, the recognizer 106 of described multi-speed motor gear is provided with electric current equivalence threshold value I by the characteristic of the gear drive coil of many grades of speed motors in advance
1, I
2..., I
J-1, I
j(I wherein
j＞I
J-1), if many grades of speed motor shelves speed progression are n, then the j maximum is n, wherein j, n are natural number.After device starts, behind all MCU nucleus modules of described motor gear recognizer initialization and the memory data, the signal that collects in real time carries out the AD conversion process through the MCU nucleus module, and numerical value after will changing then and electric current equivalence threshold value compare, as real-time collection numerical value I＞I
jThe time, then many grades of speed motors of decidable move with the most high-grade j gear; When real-time collection numerical value I meets I
J-1＜I＜I
jThe time, judge that motor is with the operation of j-1 shelves speed; As real-time collection numerical value I＜I
1The time, judge that then motor is in run-stopping status.For example, a third gear speed motor when respectively with low-grade, middle-grade or high-grade operation, by the threshold parameter of designing requirement adjusting device, then can obtain three different electric current equivalence threshold value I
1, I
2, I
3, corresponding with the high, normal, basic gear of motor respectively.When gathering numerical value is I＞I
3The time, motor is high-grade running status, is I when gathering numerical value
2＜I＜I
3The time, motor is middle-grade running status, is I when gathering numerical value
1＜I＜I
2The time, motor is the underdrive operating state, is I＜I when gathering numerical value
1The time, can determine that motor is a halted state.
Referring to Fig. 3, described multi-speed motor gear recognition device 114 only needs to be serially connected in the zero line 119 of many grades of speed motors 115, also can be divided into contact according to the different detection modes of current sensor 102 and install and contactless installation.Non-contact current sensor has respectively: D.C mutual-inductor, Hall current sensor and Luo-coil transducer only need penetrate the zero line 119 of many grades of speed motors the empty circles of non-contact current sensor; The contact current sensor has transformer dividing potential drop and electric resistance partial pressure respectively, the zero line 119 of many grades of speed motors need be inserted an end interface of current sensor 102, then other end interface is inserted the on-the-spot zero line that exchanges.
A kind of recognition methods of adopting the multi-speed motor gear recognition device, for adopting the totally zero multitap many grades of speed motors of winding, this motor is with the difference of the winding coil number of turn, realize the rotational speed regulation of different gears, gear not simultaneously, drive coil number of turn difference, the driving current value of gear are also different.Adopt the recognition methods of multi-speed motor gear recognition device, only by gathering the current value of many grades of speed motor zero lines, electric current equivalence threshold value with the known fixed gear compares with the numerical value I that collects then, the running status of identification and definite these many grades of speed motors comprises halted state and the gear that is moving.
Referring to Fig. 4, the recognition methods of described multi-speed motor gear recognition device, for many grades of speed motors 115, only need to measure the neutral line current 101 of many grades of speed motors by current detection circuit, the status recognition of this testing circuit is an analog signals, concrete operation principle is: at first gather the neutral line current 101 of many grades of speed motors by current sensor 102, with the neutral line current proportional ac current signal 116 of acquisition with many grades of speed motors; Be dc current signal 117 with above-mentioned ac current signal 116 by rectification circuit 103 rectifications then; Again above-mentioned dc current signal 117 is inserted I/V translation circuit 104, dc current signal 117 is transformed to voltage signal 118 by this translation circuit; The voltage signal 118 that obtains at last inserts gives MCU nucleus module 107, carries out state for the recognizer 106 that is built in MCU nucleus module 107 and judges neutral line current 101 proportion relation of described voltage signal 118 and many grades of speed motors.
Multi-speed motor gear recognition device of the present invention, can be applied in central air-conditioning charging field, by gear identification accurately and reliably, obtain user's service time accurately, hot exchange power in conjunction with fan coil, adopt suitable computer management software, can realize the energy meter of central air-conditioning.Rely on the function of the valve control/detection module of device, can realize the Long-distance Control of user's central air-conditioning, by communication module, remote centralized control and management that can implement device, the raising central air-conditioning use and management level and the level of informatization.
Claims (10)
1. multi-speed motor gear recognition device, it is characterized in that: current acquisition module (108) is gathered the neutral line current (101) of many grades of speed motors in real time, the current signal that collects is through signal condition, insert the AD modular converter (105) of single-chip microcomputer in the MCU nucleus module (107), the running status and the gear of many grades of speed motors are judged and discerned to the built-in recognizer of MCU nucleus module (107) (106); Multi-speed motor gear recognition device (114) is connected in series with the zero line (119) of many grades of speed motors (115).
2. multi-speed motor gear recognition device according to claim 1, it is characterized in that: current acquisition module (108) is formed testing circuit with signal conditioning circuit (109), signal conditioning circuit (109) comprises rectification circuit (103) and I/V translation circuit (104), by the neutral line current (101) of many grades of speed motors of current sensor (102) collection in the current acquisition module (108), the current signal that collects inserts signal conditioning circuit (109).
3. multi-speed motor gear recognition device according to claim 1; it is characterized in that: MCU nucleus module (107) connects communication module (111) and memory module (112); communication module (111) interface connects the serial communication interface of single-chip microcomputer in the MCU nucleus module (107), and the write-protect interface of memory module (112), serial data and interface and read-write synchronised clock interface connect the corresponding I/O interface of single-chip microcomputer in the MCU nucleus module (107) respectively.
4. multi-speed motor gear recognition device according to claim 1, it is characterized in that: valve control/detection module (110) is realized the strong and weak electricity isolation by relay, and this relay input connects the I/O output interface of single-chip microcomputer in MCU nucleus module (107).
5. according to claim 1 or 2 each described multi-speed motor gear recognition devices, it is characterized in that: current acquisition module (108) is one at least, after each realizes current/voltage-converted by the signal of current acquisition module (108) output through signal conditioning circuit (109), the AD modular converter (105) that connects single-chip microcomputer in the MCU nucleus module (107) respectively, for recognizer (106) provides real time data, realize the identification and the control of a plurality of multi-speed motor gear states.
6. multi-speed motor gear recognition device according to claim 2 is characterized in that: when current sensor (102) adopted non-contact current sensor, the zero line (119) of many grades of speed motors (115) penetrated the empty circles of current sensor (102); Perhaps, when current sensor (102) adopted the contact current sensor, an end interface of current sensor (102) inserted the zero line (119) of many grades of speed motors (115), and other end interface inserts the on-the-spot zero line that exchanges.
7. recognition methods of adopting the described multi-speed motor gear recognition device of claim 1, it is characterized in that: by the neutral line current (101) of gathering many grades of speed motors, the electric current equivalence threshold value of gathering numerical value I and known fixed gear is in real time compared, discern the running status and the gear of many grades of speed motors (115).
8. the recognition methods of multi-speed motor gear recognition device according to claim 7, it is characterized in that: the neutral line current (101) of gathering many grades of speed motors by current acquisition module (108), the ac current signal (116) that obtains is dc current signal (117) by rectification circuit (103) rectification, dc current signal (117) inserts I/V translation circuit (104) and is transformed to voltage signal (118), voltage signal (118) inserts MCU nucleus module (107), recognizer (106) by being built in MCU nucleus module (107) is to the judgement of real-time collection numerical value I, the running status and the gear of many grades of speed motors of identification.
9. the recognition methods of multi-speed motor gear recognition device according to claim 8, it is characterized in that: the neutral line current of many grades of speed motors (101) is an analog signals, neutral line current (101) proportion relation of dc current signal (117) and voltage signal (118) and many grades of speed motors.
10. according to the recognition methods of each described multi-speed motor gear recognition device of claim 7 to 9, it is characterized in that: recognizer (106) is provided with electric current equivalence threshold value I by the characteristic of the gear drive coil of many grades of speed motors in advance
1, I
2..., I
J-1, I
j, I wherein
j＞I
J-1, if many grades of speed motor shelves speed progression are n, then the j maximum is n, wherein j, n are natural number; After multi-speed motor gear recognition device (114) starts, behind described recognizer (106) initialization MCU nucleus module (107) and the memory data, the signal that collects in real time carries out the AD conversion process through MCU nucleus module (107), numerical value after will changing then and electric current equivalence threshold value compare, as real-time collection numerical value I＞I
jThe time, then many grades of speed motors of decidable move with the most high-grade j gear; When real-time collection numerical value I meets I
J-1＜I＜I
jThe time, judge that motor is with the operation of j-1 shelves speed; As real-time collection numerical value I＜I
1The time, judge that then motor is in run-stopping status.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102169140A CN101783648B (en) | 2009-12-31 | 2009-12-31 | Gear position identifying device and identifying method thereof for multi-speed motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102169140A CN101783648B (en) | 2009-12-31 | 2009-12-31 | Gear position identifying device and identifying method thereof for multi-speed motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101783648A CN101783648A (en) | 2010-07-21 |
| CN101783648B true CN101783648B (en) | 2011-05-18 |
Family
ID=42523494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102169140A Active CN101783648B (en) | 2009-12-31 | 2009-12-31 | Gear position identifying device and identifying method thereof for multi-speed motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101783648B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832881A (en) * | 2012-08-31 | 2012-12-19 | 郑州春泉暖通节能设备有限公司 | Simple motor gear identification method and device based on potential transformation technology |
| CN102830354A (en) * | 2012-08-31 | 2012-12-19 | 郑州春泉暖通节能设备有限公司 | Motor gear identification method and device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559027A (en) * | 2015-09-17 | 2017-04-05 | 北汽福田汽车股份有限公司 | For the data isolation acquisition system and method and vehicle of vehicular electric machine controller |
| CN108696200A (en) * | 2018-05-29 | 2018-10-23 | 广东威灵电机制造有限公司 | Motor and its recognition methods and identification device |
| CN110971159B (en) * | 2019-11-13 | 2022-02-08 | 齐鲁工业大学 | High-power speed regulation and protection circuit system of H-bridge direct-current motor |
| CN111442467A (en) * | 2020-04-17 | 2020-07-24 | 深圳爱思普芯科技有限公司 | Air conditioner gear detection method and detection system for detecting air conditioner gear |
| CN111726040B (en) * | 2020-07-24 | 2022-08-09 | 乐歌人体工学科技股份有限公司 | Motor drive control method applied to multi-interface motor control box |
| CN112564586B (en) * | 2020-11-30 | 2023-04-25 | 广东美的制冷设备有限公司 | Current protection control method, device, equipment and storage medium for motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4673850A (en) * | 1986-07-14 | 1987-06-16 | York International Corp. | Universal motor control system |
| US5841358A (en) * | 1993-08-12 | 1998-11-24 | Johnson Service Co. | Motor current status sensor |
| CN2603395Y (en) * | 2003-04-01 | 2004-02-11 | 杨东 | Multi-speed motor state identifier |
| CN101414803A (en) * | 2008-11-28 | 2009-04-22 | 郑州春泉暖通节能设备有限公司 | Method and apparatus for recognizing multi-speed motor gear based on voltage mutual inductance technology |
-
2009
- 2009-12-31 CN CN2009102169140A patent/CN101783648B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4673850A (en) * | 1986-07-14 | 1987-06-16 | York International Corp. | Universal motor control system |
| US5841358A (en) * | 1993-08-12 | 1998-11-24 | Johnson Service Co. | Motor current status sensor |
| CN2603395Y (en) * | 2003-04-01 | 2004-02-11 | 杨东 | Multi-speed motor state identifier |
| CN101414803A (en) * | 2008-11-28 | 2009-04-22 | 郑州春泉暖通节能设备有限公司 | Method and apparatus for recognizing multi-speed motor gear based on voltage mutual inductance technology |
Non-Patent Citations (1)
| Title |
|---|
| 姚若河等.基于DSP的电机转速测量实验.《物理实验》.2005,第25卷(第6期),第6-9页. * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832881A (en) * | 2012-08-31 | 2012-12-19 | 郑州春泉暖通节能设备有限公司 | Simple motor gear identification method and device based on potential transformation technology |
| CN102830354A (en) * | 2012-08-31 | 2012-12-19 | 郑州春泉暖通节能设备有限公司 | Motor gear identification method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101783648A (en) | 2010-07-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101783648B (en) | Gear position identifying device and identifying method thereof for multi-speed motor | |
| CN101414803B (en) | Method and apparatus for recognizing multi-speed motor gear based on voltage mutual inductance technology | |
| CN201975858U (en) | Integrated intelligent transformer | |
| CN201804054U (en) | Failure detection system for alternating-current switch machine | |
| CN102004199B (en) | Alternating current charging post in-situ test device and method | |
| CN203241817U (en) | On-line intelligent analysis and control system for operation parameters of oil pumping machine | |
| CN110763886B (en) | Single-phase user electricity stealing judgment and positioning method | |
| CN109085438A (en) | Intelligent monitoring device and method based on electrical parameter real-time monitoring oil pumping system efficiency | |
| CN201331569Y (en) | Novel multi-level motor shift-level detecting device | |
| CN103176066A (en) | Digitization power quality monitoring device | |
| CN201314677Y (en) | Multiport multi-gear speed fan coil state monitoring device | |
| CN108828375B (en) | Air conditioner electric monitoring system and method based on double-loop intelligent electric energy meter | |
| CN205157637U (en) | Generator carbon brush current distribution monitoring system | |
| CN103439546A (en) | Electric energy measuring system and method for low-voltage user photovoltaic power generation | |
| CN106569165A (en) | Electronic watt-hour meter measuring performance remote online detection system | |
| CN103964312A (en) | Energy efficiency testing device and method for electric hoist | |
| CN103616616A (en) | Fault detection method for large-scale grounding grid | |
| CN208000364U (en) | Motor gear identification device | |
| CN201737547U (en) | Real-time elevator energy efficiency record analyzer | |
| CN202008594U (en) | Multi-motor fault monitoring device | |
| CN201555891U (en) | Nine-current and four-voltage measuring device | |
| CN103604988B (en) | Elevator feedback electric energy quality and feedback energy-saving efficiency online test method and system | |
| CN203414526U (en) | Intelligent electrical parameter monitoring meter | |
| CN203433104U (en) | Real load error detector for secondary electric-energy metering loop of intelligent transformer station | |
| TWI461710B (en) | Power Quality Analyzer System |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG AKE TECHNOLOGY CO., LTD. Free format text: FORMER NAME: FOSHAN AIKE ELECTRONIC ENGINEERING CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 3, building 528200, block C, Guicheng science and Technology City, Guicheng Road, Nanhai District, Guangdong, Foshan, Dongping Patentee after: GUANGDONG AKE TECHNOLOGY CO., LTD. Address before: 528000, Guangdong, Foshan Province Nanhai District, Guicheng deep sea road 17, Han Tian science and Technology Electronic City C block 3 Building Patentee before: Foshan Aike Electronic Engineering Co., Ltd. |