CN219085556U - Single-phase asynchronous motor control experiment instrument based on low-voltage relay - Google Patents
Single-phase asynchronous motor control experiment instrument based on low-voltage relay Download PDFInfo
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Abstract
The utility model discloses a single-phase asynchronous motor control experiment instrument based on a low-voltage relay; the experimental instrument comprises: the device comprises a shell, a panel, a first low-voltage relay, a storage battery, a motor speed regulator, a first switch, a plurality of binding posts and a plurality of external wires which are connected with the binding posts in an adaptive manner; wherein: a panel is mounted on the shell in an adapting way; the first low-voltage relay and the storage battery are arranged inside the shell; the motor speed regulator is used for connecting a single-phase asynchronous motor; the motor speed regulator, the first switch and the binding post are respectively and adaptively embedded and installed on the panel; each device is connected with a binding post, is inserted into the corresponding binding post through an external lead to complete circuit connection of the device, and controls the on-off of a first switch to carry out a control experiment of the single-phase asynchronous motor; the experimental instrument adopts devices such as a low-voltage relay, a storage battery, a switch and the like, realizes the control of strong current through weak current, and is convenient for safe and reliable teaching demonstration of single-phase asynchronous motor control.
Description
Technical Field
The utility model belongs to the technical field of teaching experimental instruments, and particularly relates to a single-phase asynchronous motor control experimental instrument based on a low-voltage relay.
Background
At present, when a university and college school is carrying out a control teaching experiment of a single-phase asynchronous motor, the single-phase asynchronous motor is generally controlled by adopting a 220V relay, a contactor and other devices, and the strong-strong control has higher potential safety hazard, so that a user is careful in operation and is inconvenient to carry out the teaching demonstration of the single-phase asynchronous motor control.
Therefore, how to improve the safety of the single-phase asynchronous motor control experiment, and facilitate the experiment teaching of safely performing the single-phase asynchronous motor control, has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the utility model provides a single-phase asynchronous motor control experimental instrument based on a low-voltage relay, which at least solves the above part of technical problems, and the experimental instrument adopts devices such as the low-voltage relay, a storage battery, a switch and the like to realize the control of strong current through weak current.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a single-phase asynchronous motor control experiment instrument based on a low-voltage relay, the experiment instrument comprising: the device comprises a shell, a panel, a first low-voltage relay, a storage battery, a motor speed regulator, a first switch, a plurality of binding posts and a plurality of external wires which are connected with the binding posts in an adaptive manner; wherein:
the panel is adaptively arranged on the shell;
the first low-voltage relay and the storage battery are arranged inside the shell;
the motor speed regulator is used for connecting a single-phase asynchronous motor;
the motor speed regulator, the first switch and the binding post are respectively and adaptively embedded and installed on the panel;
the contact pins of the first low-voltage relay are respectively connected with a corresponding number of first relay binding posts;
the positive terminal and the negative terminal of the storage battery are respectively connected with a positive binding post and a negative binding post;
the COM interface, the CW interface and the CCW interface of the motor speed regulator are respectively connected with corresponding interface binding posts;
pins of the first switch are respectively connected with corresponding pin binding posts;
the external lead is used for being inserted into the corresponding binding post to complete circuit connection, and the control experiment of the single-phase asynchronous motor is carried out by controlling the on-off of the first switch.
Further, the experimental apparatus further comprises: a second low-voltage relay mounted inside the housing; and the contact pins of the second low-voltage relay are respectively connected with a corresponding number of second relay binding posts.
Further, the experimental apparatus further comprises: a third low-voltage relay mounted inside the housing; and the contact pins of the third low-voltage relay are respectively connected with a corresponding number of third relay binding posts.
Further, the first low-voltage relay, the second low-voltage relay and the third low-voltage relay are all 14-pin-DC 12V type low-voltage relays.
Further, the experimental apparatus further comprises: the panel is provided with a first switch, a second switch, a third switch and a fourth switch, the first switch, the third switch and the fourth switch are respectively matched and embedded and installed on the panel, and pins of the first switch, the third switch and the fourth switch are respectively connected with corresponding pin binding posts.
Further, the experimental apparatus further comprises: the air switch is adaptively embedded and installed on the panel, the input end of the air switch is connected with 220V alternating current, and the output end of the air switch is connected with the power input end of the motor speed regulator.
Further, the experimental apparatus further comprises: the storage battery switch is matched with and embedded in the panel, and is connected between the positive end of the storage battery and the positive wiring column to control the electric energy output of the storage battery.
Further, the shell and the panel are both wood substrates.
Further, the output voltage of the storage battery is 12V, and the storage battery is composed of any one of the following batteries: lead acid, nickel cadmium, nickel hydrogen and lithium ions.
Further, the motor speed regulator is an US-52 type alternating current motor speed regulator.
Compared with the prior art, the utility model has the beneficial effects that at least:
(1) The single-phase asynchronous motor control experiment instrument based on the low-voltage relay provided by the utility model adopts the low-voltage relay, the storage battery, the switch and other devices, so that strong current is controlled through weak current, and the experiment instrument has the advantages of high safety, simple and durable structure and flexible operation when in use; the teaching demonstration of single-phase asynchronous motor control is convenient for safely carry out.
(2) The single-phase asynchronous motor control experimental instrument based on the low-voltage relay can demonstrate all experiments of the existing single-phase asynchronous motor such as inching control, self-locking control, interlocking control, positive and negative rotation start and stop and the like of the single-phase asynchronous motor; the experimental instrument has obvious experimental effect and demonstration effect, and is interesting and ornamental; the method can exert unique advantages in the aspects of physical experiments, electroengineering experiments, common experiment teaching, science popularization and the like of universities and colleges, and has good application prospect.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the utility model is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
fig. 1 is a panel structure diagram of a single-phase asynchronous motor control experiment instrument based on a low-voltage relay.
Fig. 2 is a schematic diagram of a contact pin structure of the low-voltage relay provided by the utility model.
Fig. 3 is a schematic diagram of inching control of a single-phase asynchronous motor provided by the utility model.
Fig. 4 is a circuit diagram of the inching control of the single-phase asynchronous motor.
Fig. 5 is a schematic diagram of self-locking control of a single-phase asynchronous motor provided by the utility model.
Fig. 6 is a circuit diagram of self-locking control of the single-phase asynchronous motor.
Fig. 7 is a schematic diagram of interlocking control of a single-phase asynchronous motor provided by the utility model.
Fig. 8 is a circuit diagram of interlocking control of a single-phase asynchronous motor provided by the utility model.
Detailed Description
The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the embodiment of the utility model provides a single-phase asynchronous motor control experiment instrument based on a low-voltage relay, which specifically comprises: a housing (below the panel, not shown in the drawing), a panel 1, a first low-voltage relay KM1, a second low-voltage relay KM2, and a third low-voltage relay KM3 (below the panel, not shown in the drawing), a battery (below the panel, not shown in the drawing), a motor governor 2, a first switch S1, a second switch S2, a third switch S3, a fourth switch button S4, a plurality of posts, and a plurality of external wires (external wires for completing a circuit connection function, which are available from the prior art, not shown in the drawing), an air switch 3, and a battery switch 4; wherein:
the shell and the panel 1 are preferably made of wood base plates, are environment-friendly and healthy, are convenient to punch and install, and can be upgraded into flame-retardant materials such as polycarbonate in the later period.
As shown in fig. 2, in the embodiment, the first low-voltage relay KM1, the second low-voltage relay KM2 and the third low-voltage relay KM3 are all 14-pin-DC 12V type low-voltage relays commonly known and mature in the market, 1, 2, 3 and 4 of the 14-pin-DC 12V type low-voltage relays are fixed contacts, 5, 6, 7 and 8 are movable contacts, 9, 10, 11 and 12 are armatures, two pins 13 and 14 are connection points of a control circuit, and in the embodiment, the 13 and 14 pins are connected with a 12V power supply, and the relay starts to work normally; the relay is normally closed by connecting the pin 1 and the pin 9; the relay is normally opened when the 5 pins and the 9 pins of the relay are connected; the connection of several other feet is likewise available.
In this embodiment, in a specific application, the first low-voltage relay KM1 uses five pins of 1, 5, 9, 13 and 14, the second low-voltage relay KM2 and the third low-voltage relay KM3 use eleven pins of 1, 2, 3, 5, 6, 7, 9, 10, 11, 13 and 14, the used pins are connected with corresponding terminals, the rest pins are reserved for later function expansion, and a low-voltage relay of 5 pin-DC 12V type and two low-voltage relays of 11 pin-DC 12V type can be adopted for later cost control.
In this embodiment, the output voltage of the battery is 12V, and the battery is composed of any one of the following batteries: lead acid, nickel cadmium, nickel hydrogen and lithium ions, and in view of cost and safety, a 12V lead acid battery is preferably used in the present embodiment.
In this embodiment, the motor speed regulator 2 is preferably an US-52 type ac motor speed regulator, and the motor wire of the motor speed regulator 2 may be correspondingly connected to a single-phase asynchronous motor through a plug pin, or may be directly broken to correspondingly connect the corresponding motor wire, which is not limited herein; the motor speed regulator 2 is provided with a main line COM, a forward rotation CW, a reverse rotation CCW, a 220V input and a ground wire interface;
the motor speed regulator 2 is provided with a speed setting button and a power action switch, and can perform motor speed regulation control;
the U.S. Pat. No. 52 AC motor speed regulator adopts a novel electronic circuit, has the characteristics of small volume, high precision, wide speed regulating range and low power consumption, and realizes the functions of feeding back constant speed and stepless speed regulation for a single-phase asynchronous motor; the main technical data of the U.S. Pat. No. 52 type AC motor speed regulator are as follows:
(1) the working power supply is AC220V50/60HZ, and the voltage fluctuation range is plus or minus 10% Ue;
(2) the rated power can be selected from the following modes according to the requirement: 16W25W40W60W90W120W180W;
(3) the use environment is-10 to +50 ℃;
(4) the relative humidity is less than 90%;
(5) the speed regulation range is 90-1400r/min50HZ,90-1700r/min60HZ.
In this embodiment, the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 are all LA38-11BN type push-button switches existing in the market, wherein the first switch S1, the second switch S2 and the third switch S3 can be used as a start button (normally open switch) and the fourth switch S4 can be used as a stop button (normally closed switch); the mechanical life of the button can reach 500 ten thousand times, and the button shell is made of high-temperature flame-retardant materials, so that the button is safe and durable.
In the embodiment, the binding post adopts an all-copper binding post, so that the binding post has good conductivity and is firm and durable; the external connection wire can adopt a pistol type banana plug test wire; the circuit can be completed by being inserted into the binding post in an adapting way.
In this embodiment, the air switch 3 is a 2P air switch, the input end is connected with a zero line and a live line of 220V, the output end is connected with a 220V input interface of the motor speed regulator 2, and two binding posts are connected near the air switch 3 for testing the short-circuit protection function of the air switch 3.
The storage battery switch 4 adopts a small boat-shaped rocker switch, has sensitive response and is durable; the positive electrode end of the storage battery is connected to control the electric energy output of the storage battery.
The following describes in detail the installation mode of each component in the single-phase asynchronous motor control experiment instrument based on the low-voltage relay:
the shell of the experimental instrument comprises a bottom plate and four side plates, and the shell is provided with an installation panel 1 in an adapting way; the first low-voltage relay KM1, the second low-voltage relay KM2, the third low-voltage relay KM3 and the storage battery are fixedly arranged in the shell; the motor speed regulator 2, the air switch 3, the storage battery switch 4, the first switch S1 to the fourth switch S4 and the binding posts are respectively and adaptively embedded and installed on the panel, and the specific position setting of the above devices can be seen in fig. 1 (small circles in the drawing represent the binding posts, 42 binding posts are preferably arranged on the panel of the experimental instrument in the embodiment, and large circles with shadows in fig. 1 represent the switches S1 to S4).
The motor control function which can be realized by the experimental instrument provided by the utility model is described in detail below:
the utility model is a 14-pin low-voltage relay based on the power supply working voltage of DC12V, realizes the control of 220V strong current by 12V weak current, and effectively improves the safety of experiments by controlling the strong current by weak current. The following describes the working principles of inching control, self-locking control and interlocking control of the single-phase asynchronous motor which can be realized by the experimental instrument:
(1) inching control of the single-phase asynchronous motor:
as shown in fig. 3 and 4, the schematic diagram and the circuit diagram of the inching control of the single-phase asynchronous motor designed in the embodiment; when the single-phase asynchronous motor needs to be in inching operation, the single-phase asynchronous motor is connected with the motor speed regulator 2, the COM and CW interfaces of the motor speed regulator 2 are connected with a pair of normally open contacts of the first relay KM1, and at this time, the single-phase asynchronous motor is not powered on (it should be noted that "M" in the circuit diagram and the schematic diagram provided in this embodiment represents the motor speed regulator, and the battery switch 4 is kept on all the time in all experiments, and is therefore not reflected in the circuit diagram and the principle).
During experiments, a coil of a first switch S1 (hereinafter referred to as S1 or a button S1 for short) is pressed, a first relay KM1 (hereinafter referred to as KM1 or a relay KM1 for short) is electrified, so that an armature is attracted, and meanwhile, a main contact of the relay KM1 is driven to be closed, and a single-phase asynchronous motor is powered on to start. When the motor needs to stop running, the coil of the relay KM1 is powered off by loosening the starting button S1, the armature is reset under the action of the reset spring, the main contact of the relay KM1 is driven to be restored to be disconnected, and the motor is powered off and stopped running; the specific control flow is as follows:
starting: pressing a start button S1, powering up a coil of a relay KM1, closing a main contact of the relay KM1, connecting a COM and a CW on a speed regulator, and starting a single-phase asynchronous motor.
Stopping: releasing a button S1, losing power of a coil of a relay KM1, opening a main contact of the relay KM1, opening COM and CW on a speed regulator, and losing power and stopping running of a single-phase asynchronous motor.
(2) Self-locking control of a single-phase asynchronous motor:
as shown in fig. 5 and 6, the self-locking control schematic diagram and the circuit diagram of the single-phase asynchronous motor designed in the embodiment are shown;
design principle: the single-phase asynchronous motor is connected with the motor speed regulator 2, the COM and CW interfaces of the motor speed regulator 2 are connected with a pair of normally open contacts of the second relay KM2, the specific circuit connection is shown in FIG. 6, and the single-phase asynchronous motor is not powered on at the moment. Then the start button S2 is pressed, the normally open point of the start button S is closed, the coil of the second relay KM2 is electrified and can be attracted, the single-phase asynchronous motor operates, and the auxiliary normally open ends at the two ends are connected in parallel and closed simultaneously.
The working circuit comprises: the main contact of the relay is closed to enable the single-phase asynchronous motor to be connected into a speed regulator and a power supply to start rotation.
The control circuit: after the S2 button is pressed, electricity is sent to the KM2 coil, and after the KM2 auxiliary contact is connected, the electricity is also supplied to the KM2 coil, so that two paths of electricity supply are formed. When the start button S2 is released, although one path is disconnected, the KM2 coil still keeps energized to the coil through the path of the auxiliary contact of the KM2 coil, so as to ensure that the motor continues to operate.
The self-locking control operation flow is as follows:
pressing a start button S2, powering up a coil of a relay KM2, closing a main contact of the KM2, connecting COM and CW on a speed regulator, closing an auxiliary contact, operating a single-phase asynchronous motor, releasing S2, closing the auxiliary contact, continuously operating the single-phase asynchronous motor, pressing a button S4, and stopping the single-phase asynchronous motor.
(3) Interlocking control of the single-phase asynchronous motor:
as shown in fig. 7 and 8, the interlocking control schematic diagram and the circuit diagram of the single-phase asynchronous motor designed in the embodiment are shown;
the single-phase asynchronous motor is connected with the motor speed regulator 2, the COM and CW interfaces of the motor speed regulator 2 are connected with a pair of normally open contacts of the second relay KM2, and the COM and CCW interfaces of the motor speed regulator 2 are connected with a pair of normally open contacts of the third relay KM 3. As shown in fig. 8, the two relays are respectively connected with a pair of normally-closed contacts of each other, when KM2 is electrified, the normally-closed contacts are disconnected, and KM3 cannot be electrified; when KM3 is electrified, the normally closed contact is disconnected, and KM2 cannot get electricity, namely, interlocking is realized.
The working circuit comprises: the main contact of the relay is closed to enable the single-phase asynchronous motor to be connected into a speed regulator and a power supply to start rotation.
The control circuit: pressing the button S2, connecting the circuit of KM2, connecting the COMCW interface of the speed regulator, and rotating the motor forward. The normally closed contact of KM2 is opened, and the KM3 circuit cannot be powered. Pressing the button S3, connecting the circuit of KM3, connecting the COMCCW interface of the speed regulator, and reversing the motor. The normally closed contact in KM3 is opened, and the KM2 circuit cannot be powered.
The operation flow of the interlocking control is as follows:
(1) Pressing a start button S2, powering up a coil of a relay KM2, closing a main contact of the relay KM2, connecting a COM and a CW on a speed regulator, closing an auxiliary contact, and rotating a single-phase asynchronous motor forward;
(2) Releasing the start button S2→closing the auxiliary contact, namely the single-phase asynchronous motor continuously operates;
(3) Pressing a button S4→stopping the single-phase asynchronous motor;
(4) Pressing a start button S3, powering up a coil of a relay KM3, closing a main contact of the relay KM3, connecting a COM on a speed regulator with a CCW and closing an auxiliary contact, and reversing a single-phase asynchronous motor;
(5) S3, the auxiliary contact is opened, namely the single-phase asynchronous motor continuously operates;
(6) Pressing the button S4→the single-phase asynchronous motor stops running.
From the above experiments, it can be seen that: the single-phase asynchronous motor control experimental instrument based on the low-voltage relay provided by the utility model can perform inching control, self-locking control and interlocking control of a weak-strong control single-phase asynchronous motor, and has successful experimental instrument and circuit design and good demonstration effect.
According to the single-phase asynchronous motor control experimental instrument based on the low-voltage relay, strong current is controlled through weak current through the low-voltage relay, the storage battery, the motor speed regulator, the switch and other devices, so that the safety of an experimental process is greatly improved, and the teaching demonstration of single-phase asynchronous motor control is convenient to carry out safely and reliably; the experimental instrument can complete related control circuits such as start and stop, forward and reverse rotation and the like of the single-phase motor, can realize experimental operation and design processes such as direct output, inching control, self-locking control, interlocking control and the like of the motor, and can demonstrate all experiments of the existing asynchronous motor such as direct output, inching control, self-locking control, interlocking control, forward and reverse rotation start and stop and the like of the single-phase motor; the experimental instrument has the advantages of simple structure, ingenious design, high safety performance, fun and ornamental value, can be widely used for physical experiment teaching of large and medium schools, common physical experiment teaching and electrotechnical experiment teaching, can be used as a teaching item and a science popularization item for middle and primary schools, and has high popularization and application values such as teaching science popularization and the like.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A single-phase asynchronous motor control experiment appearance based on low-voltage relay, its characterized in that, this experiment appearance includes: the device comprises a shell, a panel, a first low-voltage relay, a storage battery, a motor speed regulator, a first switch, a plurality of binding posts and a plurality of external wires which are connected with the binding posts in an adaptive manner; wherein:
the panel is adaptively arranged on the shell;
the first low-voltage relay and the storage battery are arranged inside the shell;
the motor speed regulator is used for connecting a single-phase asynchronous motor;
the motor speed regulator, the first switch and the binding post are respectively and adaptively embedded and installed on the panel;
the contact pins of the first low-voltage relay are respectively connected with a corresponding number of first relay binding posts;
the positive terminal and the negative terminal of the storage battery are respectively connected with a positive binding post and a negative binding post;
the COM interface, the CW interface and the CCW interface of the motor speed regulator are respectively connected with corresponding interface binding posts;
pins of the first switch are respectively connected with corresponding pin binding posts;
the external lead is used for being inserted into the corresponding binding post to complete circuit connection, and the control experiment of the single-phase asynchronous motor is carried out by controlling the on-off of the first switch.
2. The single-phase asynchronous motor control experiment instrument based on the low-voltage relay according to claim 1, further comprising: a second low-voltage relay mounted inside the housing; and the contact pins of the second low-voltage relay are respectively connected with a corresponding number of second relay binding posts.
3. The single-phase asynchronous motor control experiment instrument based on the low-voltage relay according to claim 2, further comprising: a third low-voltage relay mounted inside the housing; and the contact pins of the third low-voltage relay are respectively connected with a corresponding number of third relay binding posts.
4. The single-phase asynchronous motor control experiment instrument based on the low-voltage relay according to claim 3, wherein the first low-voltage relay, the second low-voltage relay and the third low-voltage relay are all 14-pin-DC 12V type low-voltage relays.
5. The single-phase asynchronous motor control experiment instrument based on the low-voltage relay according to claim 1, further comprising: the panel is provided with a first switch, a second switch, a third switch and a fourth switch, the first switch, the third switch and the fourth switch are respectively matched and embedded and installed on the panel, and pins of the first switch, the third switch and the fourth switch are respectively connected with corresponding pin binding posts.
6. The single-phase asynchronous motor control experiment instrument based on the low-voltage relay according to claim 1, further comprising: the air switch is adaptively embedded and installed on the panel, the input end of the air switch is connected with 220V alternating current, and the output end of the air switch is connected with the power input end of the motor speed regulator.
7. The single-phase asynchronous motor control experiment instrument based on the low-voltage relay according to claim 1, further comprising: the storage battery switch is matched with and embedded in the panel, and is connected between the positive end of the storage battery and the positive wiring column to control the electric energy output of the storage battery.
8. The single-phase asynchronous motor control experiment instrument based on the low-voltage relay according to claim 1, wherein the shell and the panel are both wooden substrates.
9. The single-phase asynchronous motor control experiment instrument based on the low-voltage relay according to claim 1, wherein the output voltage of the storage battery is 12V, and the single-phase asynchronous motor control experiment instrument is composed of any one of the following batteries: lead acid, nickel cadmium, nickel hydrogen and lithium ions.
10. The single-phase asynchronous motor control experiment instrument based on the low-voltage relay according to claim 1, wherein the motor speed regulator is an US-52 type alternating current motor speed regulator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222698063.1U CN219085556U (en) | 2022-10-13 | 2022-10-13 | Single-phase asynchronous motor control experiment instrument based on low-voltage relay |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222698063.1U CN219085556U (en) | 2022-10-13 | 2022-10-13 | Single-phase asynchronous motor control experiment instrument based on low-voltage relay |
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| CN219085556U true CN219085556U (en) | 2023-05-26 |
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| CN202222698063.1U Active CN219085556U (en) | 2022-10-13 | 2022-10-13 | Single-phase asynchronous motor control experiment instrument based on low-voltage relay |
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