CN111398684A - Motor winding temperature rise testing device based on resistance method - Google Patents
Motor winding temperature rise testing device based on resistance method Download PDFInfo
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- CN111398684A CN111398684A CN202010363011.1A CN202010363011A CN111398684A CN 111398684 A CN111398684 A CN 111398684A CN 202010363011 A CN202010363011 A CN 202010363011A CN 111398684 A CN111398684 A CN 111398684A
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- contactor
- temperature rise
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- motor winding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The invention relates to a resistance method-based motor winding temperature rise testing device, which comprises a switch, a contactor KM1, a contactor KM2, a resistance measuring instrument F1, a resistance measuring instrument F2, three wiring terminals XT1, XT2 and XT3, wherein the three wiring terminals are arranged on the switch; each contactor is provided with at least two normally open contacts and two normally closed contacts, and the normally open contacts and the normally closed contacts are interlocked; connecting terminals XT2 and XT3 are respectively connected to two ends of a resistance measuring instrument F2 through two normally closed contacts of the contactor, and connecting terminals XT1 and XT2 are respectively connected to two ends of a resistance measuring instrument F1 through the other two normally closed contacts of the contactor on one hand and also respectively get electricity outwards through two normally open contacts of the contactor on the other hand; the switch is used for switching the power-on state/the power-off state of the control coils of all the contactors. The invention can realize that one person independently finishes the test, can quickly finish the resistance test of the cold-state winding and the hot-state winding, and can be suitable for various loads needing to test the temperature rise of the winding.
Description
Technical Field
The invention relates to a motor performance test, in particular to a motor winding temperature rise test device based on a resistance method.
Background
For a motor, the winding temperature rise is one of important indexes for checking the performance of the motor, and in each application, the temperature rise test needs to be carried out on the application of the motor on the corresponding complete machine load, while a resistance method is a common motor winding temperature rise test method, and the specific test steps are as follows:
1) fixing the motor on the whole machine load to be applied according to the test requirements of each machine type;
2) moving the load of the whole machine to a test site, waiting for 120 minutes, recording the environmental temperature t1 at the beginning of the test according to a thermometer after the motor state is stable, and generally recommending 25 ℃;
3) and (3) carrying out cold winding resistance test: testing the cold resistance of the motor winding at the beginning of a test by using a universal meter (taking a single-phase single-gear asynchronous motor as an example, firstly testing the cold resistance R1 and R1' of the main winding and the auxiliary winding at the moment, and generally testing the two-phase winding resistance of the motor one by using the resistance gear of the universal meter manually);
4) preparing a test power supply, electrifying to allow the motor to continuously run for 4 hours (manual timing), and recording the environmental temperature t2 at the end of the test according to a thermometer after the temperature rise of a winding coil of the motor is stable;
5) and (3) carrying out a thermal state winding resistance test: cutting off a power supply, generally manually and rapidly stopping the motor from the running state by using a flexible device (such as foam or a wood board) in order to rapidly and accurately obtain the temperature rise data at the moment, and then manually and one by one testing thermal state resistors R2 and R2' of a main winding and an auxiliary winding of the motor when the motor stops by using a universal meter;
6) according to the following formula, the temperature rise values △ t and △ t' of the main winding and the auxiliary winding are calculated, for example, taking a common copper enameled wire for a motor winding as an example, the corresponding resistance method temperature rise test formula is as follows:
wherein △ t is winding temperature rise, R1 is resistance at the beginning of test, R2 is resistance at the end of test, t1 is temperature at the beginning of test, t2 is temperature at the end of test, and 234.5 is copper winding coefficient.
The disadvantages of the above method are:
the resistance of each winding of the motor needs to be tested by a manual multimeter in the cold state and the hot state of the motor, and because the resistance is related to different types of motors in the testing process, such as a single-phase motor which needs to test a main winding and an auxiliary winding respectively, such as a three-phase motor which needs to test a three-phase winding respectively, and the actions of powering on, powering off, manually preventing the motor from stopping, reading the resistance values of different windings and the like are related to the process, the temperature rise testing work can not be completed by one person, and at the moment, the design of a testing tool is particularly urgent.
Disclosure of Invention
The invention provides a motor winding temperature rise testing device based on a resistance method to overcome the defects of the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
provides a motor winding temperature rise testing device based on a resistance method,
the device comprises a switch, a contactor KM1, a contactor KM2, a resistance measuring instrument F1, a resistance measuring instrument F2 and three wiring terminals XT1, XT2 and XT 3;
each contactor is provided with at least two normally open contacts and two normally closed contacts, and the normally open contacts and the normally closed contacts are interlocked;
connecting terminals XT2 and XT3 are respectively connected to two ends of a resistance measuring instrument F2 through two normally closed contacts of the contactor, and connecting terminals XT1 and XT2 are respectively connected to two ends of a resistance measuring instrument F1 through the other two normally closed contacts of the contactor on one hand and also respectively get electricity outwards through two normally open contacts of the contactor on the other hand;
the switch is used for switching the power-on state/the power-off state of the control coils of all the contactors.
And further, the system also comprises a timing instrument, wherein the timing instrument is triggered by the action of the switch, the control coils of all the contactors are switched to be in a power-on state, and the control coils of all the contactors are switched to be in a power-off state after a set time length.
Further, the timing instrument is specifically a time relay, the switch is used for controlling the power-on state/power-off state of a control coil of the time relay, and the time relay is provided with a normally open contact for supplying power to the control coils of all contactors.
Furthermore, the switch is provided with a plurality of conducting channels, and after the connecting terminals XT1 and XT2 are respectively connected with the normally open contacts in series, one conducting channel is used for taking electricity outwards.
Further, the contactor KM3 and the resistance measuring instrument F3 are further included, connecting terminals XT1 and XT3 are respectively connected to two ends of the resistance measuring instrument F3 through two normally closed contacts which are not used in the contactor, and a connecting terminal XT3 draws electricity outwards through the other normally open contact of the contactor.
Furthermore, the switch is provided with a plurality of conducting channels, and after the connecting terminals XT1, XT2 and XT3 are respectively connected in series with the normally open contacts, one conducting channel is used for taking power outwards.
Furthermore, the switch at least has an unused conduction channel to connect with the external N line.
Further, the switch is in particular a circuit breaker.
Further, the resistance measuring instrument is specifically a multimeter.
Has the advantages that:
the motor winding temperature rise testing device can realize that one person independently finishes testing, cold-state and hot-state winding resistance testing can be quickly finished, and in addition, the motor winding temperature rise testing device can be repeatedly used and can be suitable for various loads needing to test the winding temperature rise.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic circuit diagram of the testing device of the present invention applied to a single-phase load test;
fig. 2 is a schematic circuit diagram of the testing device of the present invention applied to a three-phase load test.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example 1
Referring to fig. 1, the testing apparatus of the present embodiment is applied to a single-phase load test, and mainly includes:
(1) the circuit breaker QF1 has the type selection requirement as follows: the number of poles is 2 poles according to the requirement, and the rated current is selected according to the load;
(2) time relay KT1, its lectotype requirement is: the timing time can be set according to the requirement, at least one group of normally open contacts are provided, and the rated voltage and current of the contacts meet the working requirements of a matched alternating current contactor;
(3) the alternating current contactors KM1 and KM2 have the following requirements on type selection: 2 normally open contacts and 2 normally closed contacts are provided, the normally open contacts and the normally closed contacts are interlocked, and the rated voltage and current of the contacts meet the requirements of a test load;
(4) conventional multimeters F1, F2, and wire terminals XT1, XT2, XT 3.
In the testing device, connecting terminals XT2 and XT3 are respectively connected to two ends of a multimeter F2 through 2 normally closed contacts (5/6 and 7/8) of an alternating current contactor KM2, connecting terminals XT1 and XT2 are respectively connected to two ends of the multimeter F1 through 2 normally closed contacts (5/6 and 7/8) of the alternating current contactor KM1 on one hand, and are also respectively connected to a breaker QF1 through 2 normally open contacts (1/2 and 3/4) of the alternating current contactor KM1 on the other hand, and electricity is taken out through the breaker QF 1.
Two lines between 2 normally open contacts of the alternating current contactor KM1 and the breaker QF1 supply power to control coils (A1 and A2) of a time relay KT1, and a group of normally open contacts (15 and 18) of the time relay KT1 supply power to control coils (A1 and A2) of the alternating current contactors KM1 and KM 2.
The test apparatus of this example was used as follows:
(1) as shown in fig. 1, after the preparation of the complete machine load (L oad) with a motor is completed, wiring is completed according to a right-side dotted line part, after the complete machine load is placed in a test site for a set time, cold resistance values of a main winding (brown + black) and an auxiliary winding (red + black) of the motor are directly read through multimeters F1 and F2, and the ambient temperature t1 at the moment is recorded, in the process, because a breaker QF1 is not closed yet, normally closed contacts of alternating current contactors KM1 and KM2 are always in a closed state, so the multimeters F1 and F2 are automatically connected to the connection position without manual operation;
(2) setting the timing time of a time relay KT1 according to the test requirements;
(3) a test power supply is connected to a load of the whole machine through a closing breaker QF1, the load is electrified to start a test, at the moment, a control coil (A1 and A2) of a time relay KT1 is electrified, the time relay KT1 starts timing work, normally open contacts (15 and 18) of the time relay KT1 are switched from a normally open state to a normally closed state, control coils (A1 and A2) of KM1 and KM2 are electrified, normally open contacts (1/2 and 3/4) of KM1 and KM2 are switched from a normally open state to a closed state, a motor is electrified to work, meanwhile, the normally closed contacts (5/6 and 7/8) of KM1 and KM2 are switched from a normally closed state to an open state, the connection between universal meters F1 and F2 and a motor winding is automatically cut off, and a;
(4) when the working time of KT1 reaches the set timing time, the normally open contacts (15 and 18) are converted from the normally closed state to the normally open state, at the moment, the control coils (A1 and A2) of KM1 and KM2 are powered off, the normally open contacts (1/2 and 3/4) of KM1 and KM2 are disconnected, the motor is powered off and stops working, meanwhile, the normally closed contacts (5/6 and 7/8) of KM1 and KM2 are closed, multimeters F1 and F2 are connected, at the moment, the motor is rapidly stopped from the running state through a manual flexible device, namely, the thermal state resistance values of a main winding (brown + black) and an auxiliary winding (red + black) can be directly read out at one time through the multimeters F1 and F2, and the ambient temperature t2 at the moment is recorded;
(5) the temperature rise value of the motor is calculated by the formula mentioned in the background art.
The testing device of the embodiment has the advantages that:
(1) the circuit breaker is arranged at the input end of the power supply, so that the circuit breaker can be tripped in time to prevent danger in case of short circuit caused by wiring errors;
(2) the test platform is realized by a pure electric circuit, the investment of software and hardware design is not needed, the components are simple, the cost is low, and the test platform can be quickly built;
(3) when the test tool is built, one person can independently complete the test, and the cold-state and hot-state winding resistance tests can be quickly completed;
(4) the test fixture can be repeatedly used and designed once, and is applicable to various loads needing to test the temperature rise of the winding by adopting the same scheme.
It should be noted that, in this embodiment, the time relay KT1 may be replaced by another timing instrument, such as a control coil for timing control of KM1 and KM2 in the form of a controller, the multimeters F1 and F2 may be replaced by other resistance measurement instruments, and the breaker QF1 may be replaced by another switch.
Further, a display screen can be provided for displaying the detection value (such as resistance value) of each multimeter during testing, the detection value (such as temperature and humidity) of the current testing environment and the testing result (such as temperature rise of a motor winding) when testing is completed.
Example 2
Referring to fig. 2, in embodiment 2, based on embodiment 1, an ac contactor KM3 and a multimeter F3 are additionally provided, and a breaker QF1 is selected as a 4-pole breaker, so that the circuit is changed as follows:
connecting terminals 1 and XT3 are respectively connected to two ends of a multimeter F3 through 2 normally closed contacts (5/6 and 7/8) of an alternating current contactor KM3, connecting terminals XT2 and XT3 are respectively connected to two ends of a multimeter F2 through 2 normally closed contacts (5/6 and 7/8) of the alternating current contactor KM2, connecting terminals XT1 and XT2 are respectively connected to two ends of the multimeter F1 through 2 normally closed contacts (5/6 and 7/8) of the alternating current contactor KM1 on the one hand, and are also respectively connected to two poles L1 and L2 of a breaker QF1 through 2 normally open contacts (1/2 and 3/4) of the alternating current contactor KM1 on the other hand, and a pole XT L3 of the breaker QF1 is connected to the XT3 through one normally open contact (1/2) of the alternating current contactor KM 3.
The power supply of control coils (A1 and A2) of a time relay KT1 is respectively from one pole of a breaker QF1 connected with phase electricity and an N pole to get electricity, and a group of normally open contacts (15 and 18) of the time relay KT1 supply power to the control coils (A1 and A2) of alternating current contactors KM1, KM2 and KM 3.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. Motor winding temperature rise testing arrangement based on resistance method, its characterized in that:
the device comprises a switch, a contactor KM1, a contactor KM2, a resistance measuring instrument F1, a resistance measuring instrument F2 and three wiring terminals XT1, XT2 and XT 3;
each contactor is provided with at least two normally open contacts and two normally closed contacts, and the normally open contacts and the normally closed contacts are interlocked;
connecting terminals XT2 and XT3 are respectively connected to two ends of a resistance measuring instrument F2 through two normally closed contacts of the contactor, and connecting terminals XT1 and XT2 are respectively connected to two ends of a resistance measuring instrument F1 through the other two normally closed contacts of the contactor on one hand and also respectively get electricity outwards through two normally open contacts of the contactor on the other hand;
the switch is used for switching the power-on state/the power-off state of the control coils of all the contactors.
2. The motor winding temperature rise test device of claim 1, wherein: the timing instrument is triggered by the action of the switch, the control coils of all the contactors are switched to be in a power-on state, and the control coils of all the contactors are switched to be in a power-off state after a set time length.
3. The motor winding temperature rise test device of claim 2, wherein: the timing instrument is specifically a time relay, the switch is used for controlling the power-on state/power-off state of a control coil of the time relay, and the time relay is provided with a normally open contact to supply power to the control coils of all contactors.
4. The motor winding temperature rise test device of claim 1 or 3, wherein: the switch is provided with a plurality of conducting channels, and after the wiring terminals XT1 and XT2 are respectively connected with the normally open contacts in series, one conducting channel is used for getting electricity outwards.
5. The motor winding temperature rise test device of claim 4, wherein: the switch is in particular a circuit breaker.
6. A motor winding temperature rise test device according to claim 1, 2 or 3, characterized in that: the contactor further comprises a contactor KM3 and a resistance measuring instrument F3, connecting terminals XT1 and XT3 are connected to two ends of the resistance measuring instrument F3 through two unused normally closed contacts in the contactor respectively, and a connecting terminal XT3 draws electricity outwards through the other normally open contact of the contactor.
7. The motor winding temperature rise test device of claim 6, wherein: the switch is provided with a plurality of conducting channels, and after the connecting terminals XT1, XT2 and XT3 are respectively connected with normally open contacts in series, one conducting channel is used for getting electricity outwards.
8. The motor winding temperature rise test device of claim 7, wherein: the switch is provided with at least one unused conduction channel to be externally connected with the N line.
9. The motor winding temperature rise test device of claim 8, wherein: the switch is in particular a circuit breaker.
10. The motor winding temperature rise test device of claim 1, wherein: the resistance measuring instrument is in particular a multimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010363011.1A CN111398684A (en) | 2020-04-30 | 2020-04-30 | Motor winding temperature rise testing device based on resistance method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010363011.1A CN111398684A (en) | 2020-04-30 | 2020-04-30 | Motor winding temperature rise testing device based on resistance method |
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| CN111398684A true CN111398684A (en) | 2020-07-10 |
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| CN202010363011.1A Pending CN111398684A (en) | 2020-04-30 | 2020-04-30 | Motor winding temperature rise testing device based on resistance method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946367A (en) * | 2021-01-21 | 2021-06-11 | 威凯检测技术有限公司 | Winding temperature rise test method capable of rapidly measuring winding thermal state resistance value |
| CN113009340A (en) * | 2021-03-15 | 2021-06-22 | 日立电梯电机（广州）有限公司 | Motor temperature rise testing device, testing control method thereof and controller |
| CN113267271A (en) * | 2021-05-07 | 2021-08-17 | 广东白云学院 | Thermal state winding temperature rise test system and method |
-
2020
- 2020-04-30 CN CN202010363011.1A patent/CN111398684A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946367A (en) * | 2021-01-21 | 2021-06-11 | 威凯检测技术有限公司 | Winding temperature rise test method capable of rapidly measuring winding thermal state resistance value |
| CN112946367B (en) * | 2021-01-21 | 2023-09-12 | 威凯检测技术有限公司 | Winding temperature rise test method capable of rapidly measuring thermal state resistance value of winding |
| CN113009340A (en) * | 2021-03-15 | 2021-06-22 | 日立电梯电机（广州）有限公司 | Motor temperature rise testing device, testing control method thereof and controller |
| CN113009340B (en) * | 2021-03-15 | 2023-02-28 | 日立电梯电机（广州）有限公司 | Motor temperature rise testing device, testing control method thereof and controller |
| CN113267271A (en) * | 2021-05-07 | 2021-08-17 | 广东白云学院 | Thermal state winding temperature rise test system and method |
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