CN211830632U - Motor control circuit of shared frequency converter - Google Patents
Motor control circuit of shared frequency converter Download PDFInfo
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- CN211830632U CN211830632U CN201921776749.XU CN201921776749U CN211830632U CN 211830632 U CN211830632 U CN 211830632U CN 201921776749 U CN201921776749 U CN 201921776749U CN 211830632 U CN211830632 U CN 211830632U
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- contactor
- motor
- frequency converter
- control circuit
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Abstract
The utility model relates to a motor control circuit sharing a frequency converter, which comprises a plurality of motors, a plurality of contactors and at least one frequency converter; the contactor comprises a main contact and an auxiliary contact, wherein the auxiliary contact comprises at least two groups of normally open contacts and a plurality of groups of normally closed contacts; each motor is connected with the alternating current output end of the corresponding frequency converter through the main contact of the corresponding contactor; each contactor controls the opening and closing of a corresponding normally open contact through a contactor control branch, wherein after one group of normally open contacts of the contactor are connected with a corresponding motor starting switch in parallel, the normally open contacts of the contactor are connected with a motor stopping switch corresponding to the contactor, a coil of the contactor and normally closed contacts of each group of contactors locked by the contactor in series and are connected with a power supply; and a pair of starting terminals of the frequency converter are respectively connected to two ends of a normally open contact on each corresponding contactor control branch. The motor control circuit realizes that one frequency converter drives a plurality of motors in a time-sharing manner, and effectively saves equipment.
Description
Technical Field
The utility model relates to a motor control technical field especially relates to a motor control circuit of sharing converter.
Background
The frequency converter is a power control device for controlling the operation of the motor, and at present, a conventional arrangement scheme is that one frequency converter controls one motor. When a plurality of motors in the same system do not need to operate simultaneously, for example, only one motor or two motors operate at the same time, and other motors do not need to be started, under the condition, each motor is provided with a frequency converter, so that the problems of high equipment cost, large occupied space, complex circuit and the like exist. Therefore, a solution is needed to share the frequency converter, and drive a plurality of motors by using one frequency converter.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a motor control circuit of sharing converter utilizes a converter drive a plurality of motors to ensure the security of working circuit.
In order to solve the technical problem, the utility model provides a motor control circuit of sharing converter, include:
the system comprises a plurality of motors, a plurality of contactors and at least one frequency converter; the contactor comprises a main contact and an auxiliary contact, wherein the auxiliary contact comprises at least one group of normally open contacts and a plurality of groups of normally closed contacts;
each motor is connected with the corresponding alternating current output end of the frequency converter through the corresponding main contact of the contactor;
each contactor controls the opening and closing of a corresponding normally open contact through a contactor control branch; the contactor control branch is provided with a group of normally open contacts of the contactor, a coil of the contactor, a motor starting switch and a motor stopping switch corresponding to the contactor, and a group of normally closed contacts of each contactor locked by the contactor; after a group of normally open contacts of the contactor is connected with a corresponding motor starting switch in parallel, the normally open contacts are connected with a motor stopping switch corresponding to the contactor, a coil of the contactor and normally closed contacts of the contactor locked by the contactor in series and connected with a power supply;
and a pair of starting terminals of the frequency converter are respectively connected to two ends of a normally open contact on each corresponding contactor control branch.
Preferably, the motor start switch is a button type normally open switch, and the motor stop switch is a button type normally closed switch.
Preferably, the motor control circuit further comprises a rotary switch;
the rotary switch comprises at least two gears, each gear corresponds to at least one contactor control branch, and each contactor control branch corresponding to each gear is connected in parallel, then connected in series with the gear and connected into a power supply.
Preferably, the rotary switch is a two-gear rotary switch, and each gear corresponds to 3-5 contactor control branches.
Preferably, the motor control circuit comprises two frequency converters;
each motor corresponds to two contactors, and one motor is respectively connected with the alternating current output ends of the two corresponding frequency converters through the main contacts of the two corresponding contactors.
Preferably, the motor control circuit comprises 6-10 motors.
Preferably, the auxiliary contacts of the contactor include at least two sets of normally open contacts.
The above technical scheme of the utility model has following advantage: the utility model provides a motor control circuit sharing a frequency converter, which comprises a plurality of motors, a plurality of contactors and at least one frequency converter; each motor is connected with the frequency converter through the corresponding contactor, one frequency converter can drive a plurality of motors to work in a time-sharing mode, and the contactors which possibly conflict with each other form interlocking based on the circuit, so that the safety of the circuit is ensured. The motor control circuit can effectively simplify required equipment and save space, and is high in circuit similarity, simple in wiring, easy to maintain, economical and practical.
Drawings
Fig. 1 is a schematic diagram of a first-stage circuit connection of a motor control circuit (one frequency converter drives six motors in a time-sharing manner) sharing a frequency converter according to an embodiment of the present invention;
FIG. 2 is a schematic view of the main connection points of the contactor;
fig. 3 is a schematic diagram of a first-stage circuit connection of a motor control circuit (two frequency converters drive six motors in a time-sharing manner) sharing a frequency converter according to an embodiment of the present invention;
fig. 4(a) to fig. 4(d) are schematic diagrams of two-stage circuit connections of a motor control circuit (two frequency converters drive six motors in a time-sharing manner) sharing a frequency converter according to an embodiment of the present invention; fig. 4(a) is a schematic diagram of six contactor control branches corresponding to one frequency converter, fig. 4(b) is a schematic diagram of connection between one frequency converter starting terminal and six corresponding contactors, fig. 4(c) is a schematic diagram of six contactor control branches corresponding to another frequency converter, and fig. 4(d) is a schematic diagram of connection between another frequency converter starting terminal and six corresponding contactors.
In the figure: 100: a frequency converter; 200: a motor; 300: a contactor is provided.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 1, fig. 2, fig. 3, and fig. 4(a) to fig. 4(d), an embodiment of the present invention provides a motor control circuit for a shared frequency converter, including: a plurality of motors 200, a plurality of contactors 300, and at least one inverter 100. As shown in fig. 2, the contactor 300 includes a main contact, an auxiliary contact, and a coil. The main contact of the contactor 300 is used for connecting a primary circuit related to the motor, that is, a power supply circuit, so as to supply power to the corresponding motor 200 and drive the motor 200 to work. The motor 200 includes, but is not limited to, a three-phase ac motor, and is not further limited thereto.
As shown in fig. 2, the auxiliary contacts of the contactor 300 include at least one set of normally open contacts (KM-1) and a plurality of sets of normally closed contacts (KM-2) for connecting with a secondary circuit related to the motor, i.e., a power supply conducting circuit, so as to control the conduction of the primary circuit. As to how to specifically control the power supply conduction, it is considered that the contactor is the prior art, and details are not described herein. Preferably, the auxiliary contacts of contactor 300 include at least two normally open sets, one set for connecting to the motor related secondary circuit and one set for self-latching of contactor 300.
As shown in fig. 1, each motor 200 is connected to the ac output terminal of the corresponding inverter 100 through the main contact of the corresponding contactor 300. When one frequency converter 100 is adopted, each motor 200 corresponds to one contactor 300, and the N motors 200 are respectively connected with the frequency converter 100 through main contacts of the N contactors 300 (N is a positive integer greater than 1).
In order to ensure that only one motor 200 can be driven to work by one frequency converter 100 at the same time, each contactor 300 controls the opening and closing of the corresponding normally open contact through one contactor control branch. The normally open contact of the contactor 300 is used as a dry contact to control the start and stop of the frequency converter, thereby realizing the control of the output of the frequency converter to the corresponding motor.
Specifically, a contactor control branch is provided with: the contactor comprises a set of normally open contacts (KM-1) of the contactor, a coil (KM) of the contactor, a motor starting switch (SB2) and a motor stopping switch (SB1) which correspond to the contactor, and a set of normally closed contacts (KM-2) of each contactor locked by the contactor. As shown in fig. 4(a) and 4(c), when a contactor control branch is connected, after a group of normally open contacts (KM-1) of the contactor is connected in parallel with a corresponding motor start switch (SB2), the normally open contacts (KM-2) of the contactor locked by the contactor are connected in series with a motor stop switch (SB1) corresponding to the contactor, a coil (KM) of the contactor itself, and a power supply is connected, for example, between a live wire (L) and a neutral wire (N), or a 380V power supply.
As shown in fig. 4(b) and 4(d), a pair of start terminals (COM, S1) of the frequency converter are respectively connected to two ends of the normally open contact (KM-1) of the corresponding contactor control branch, that is, the start terminals of the frequency converter are connected through the normally open contact of the corresponding contactor of the frequency converter.
For one contactor control branch, after a motor starting switch (SB2) is pressed, the circuit is communicated, a normally open contact (KM-1) of an access circuit in the contactor is closed, a pair of starting terminals of a frequency converter is communicated, the frequency converter is started to operate, meanwhile, a main contact of the contactor is attracted, a power supply circuit of the motor is communicated, and the output of the frequency converter drives the corresponding motor to start to operate through the contactor. When the motor starting switch (SB2) on the contactor control branch is pressed, the two ends of the normally closed contact (KM-2) of each other contactor connected into the circuit are electrified, and at the moment, the motor starting switch (SB2) in the other contactor control branch is pressed to be ineffective, so that each other contactor connected into the circuit is locked. When an accident occurs, the main contact of the contactor is attracted in other contactors locked by the contactor, the corresponding normally closed contact is disconnected, the control branch of the contactor where the contactor is located is immediately disconnected, the frequency converter stops working, the main circuit is disconnected, two motors corresponding to one frequency converter are prevented from being started at the same time, and the conflicting contactors can be interlocked, so that the safety of the circuit is ensured. The utility model provides an usable converter timesharing of motor control circuit of sharing converter drives many motors to safety, reliable, the circuit is simple, economical and practical.
Preferably, the motor start switch is a button type normally open switch, and the motor stop switch is a button type normally closed switch. By pressing a button type motor starting switch, the circuit can be communicated, the starting ends (COM and S1 ends) of the frequency converter 100 are communicated, and the frequency converter 100 is controlled to start. By pressing the button-type motor stop switch, the circuit is broken, and the inverter 100 is stopped from driving the corresponding motor 200. Further, a set of motor start and stop switches on one contactor control branch may employ, but is not limited to, a lighted two-gang push-button switch APBB-22&25N, which can save the number of components installed in the circuit.
In particular, since a plurality of contactors 300 are locked with each other in each contactor control branch, the more contactors 300 are interlocked, the more normally closed contacts (KM-2) are required, and the practical application is difficult, the wiring is complicated, and errors are easy. Preferably, as shown in fig. 4(a) and 4(c), the motor control circuit further includes a rotary Switch (SA). The rotary switch comprises at least two gears, each gear corresponds to at least one contactor control branch, and each contactor control branch corresponding to each gear is connected in parallel, then is connected in series with the gear, is connected with a power supply, and forms a secondary circuit related to each motor. Further, rotary switch is two grades of rotary switch, including two gears, and every gear corresponds 3 ~ 5 contactor control branches. The rotary switch can be, but is not limited to, a LAY3 rotary switch.
The gear switching is carried out through the rotary switch, the control branches of the multiple parallel contactors can be separated from each other, so that the control branches can not be switched on simultaneously, and the mutual locking is realized. The mode can effectively save the normally closed contacts required by the interlocking of the contactor and simplify the connecting circuit. Because the number of elements on one contactor control branch is less, the motor control circuit does not relate to PLC, does not use an intermediate relay, completes complex circuit control through simple low-cost elements, has high similarity of connecting circuits, is easy to connect and is simple to maintain except effectively saving the cost of electrical elements.
Example two
As shown in fig. 3 and fig. 4(a) to 4(d), the second embodiment is basically the same as the first embodiment, and the description of the same parts is omitted, except that:
in this embodiment, the motor control circuit includes two frequency converters 100, as shown in fig. 3, each motor 200 corresponds to two contactors 300, one motor 200 is connected to the ac output terminals of the two corresponding frequency converters 100 through the main contacts of the two corresponding contactors 300, for convenience of distinguishing, the two frequency converters are numbered as a frequency converter a and a frequency converter B, the N motors are connected to the frequency converter a through N contactors respectively, and then connected to the frequency converter B through N contactors, that is, connected to the two frequency converters (A, B) through 2N contactors in total, and the range of N is preferably 6 to 10. Fig. 3 and 4(a) to 4(d) show a technical scheme in which 6 motors 200 are connected to two frequency converters 100 through 12 contactors 300.
Referring to fig. 4(a) to 4(d), the motor control circuit provided by the present invention adopts a technical solution that 6 motors 200 are connected to 2 frequency converters 100 through 12 contactors 300 to realize arbitrary driving of one or two motors, at this time, as shown in fig. 4(a) and 4(c), preferably, the motor control circuit includes six motors 200 and two rotary switches (SA-A, SA-B), each rotary switch includes two gears, and each gear corresponds to three contactor control branches.
For convenience of description, 6 motors are numbered from 1 to 6, and the contactor corresponds to the motor and the frequency converter, for example, the contactor 1-KM-A indicates that the contactor corresponds to the motor and the frequency converter A which are connected with the number 1, the auxiliary contact 1-KM-A-1 indicates a normally open contact of the contactor, and the auxiliary contact 1-KM-A-2 indicates a normally closed contact of the contactor. When the rotary switch SA-A corresponding to the frequency converter A is adjusted to the gear of the motor corresponding to the connection numbers 1, 2 and 3, the contactors of the motors corresponding to the connection numbers 4, 5 and 6 are invalid, and the corresponding motor starting switches are invalid and cannot be started.
In this case, on the contactor control branch where the contactor 1-KM-a is located, only three of the motor with the connection numbers 2 and 3 and the contactors 2-KM-a and 3-KM-a of the frequency converter a and the motor with the connection number 1 and the contactor 1-KM-B of the frequency converter B need to be locked, that is, only the normally closed contacts of the three contactors need to be accessed, each contactor also only needs to have three groups of normally closed contacts and respectively access the three contactor control branches, and so on, and each contactor which may cause a conflict completes interlocking based on a circuit, so that the frequency converter 100 and the motor 200 can be driven one by one at the same time interval. Because the rotary switch is adopted for grouping, the circuit complexity is effectively reduced.
Preferably, contactor 300 includes a CJX series ac contactor, such as CJX 2-4011, which typically has a set of normally open contacts and a set of normally closed contacts, and extended auxiliary contacts, which do not independently accomplish the interlocking of the contactors in three contactor control legs. Therefore, the number of the normally open contacts and the normally closed contacts of the contactor can be expanded by adding the expansion auxiliary contact. The expansion auxiliary contact can adopt F4-11 or F4-22 auxiliary contacts, the F4-11 auxiliary contact is provided with a group of normally open contacts and a group of normally closed contacts, and the F4-22 auxiliary contact is provided with two groups of normally open contacts and two groups of normally closed contacts. By combining the contactor with lower cost in the market with the F4-22 auxiliary contact, the auxiliary contact of the contactor 300 can comprise multiple groups of normally open contacts and multiple groups of normally closed contacts, and the interlocking of the three contactors 300 is met.
According to the technical scheme, two of the six motors 200 can be driven by the two frequency converters 100 at will, the working speeds of the two motors 200 can be adjusted at will according to requirements, and in practical application, for example, six different materials are respectively conveyed by the six motors 200, and one or two materials can be conveyed to the auger by the motor control circuit through the motors 200 with different rotating speeds to be prepared into new materials with different proportions.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. A common inverter motor control circuit, comprising:
the system comprises a plurality of motors, a plurality of contactors and at least one frequency converter; the contactor comprises a main contact and an auxiliary contact, wherein the auxiliary contact comprises at least one group of normally open contacts and a plurality of groups of normally closed contacts;
each motor is connected with the corresponding alternating current output end of the frequency converter through the corresponding main contact of the contactor;
each contactor controls the opening and closing of a corresponding normally open contact through a contactor control branch; the contactor control branch is provided with a group of normally open contacts of the contactor, a coil of the contactor, a motor starting switch and a motor stopping switch corresponding to the contactor, and a group of normally closed contacts of each contactor locked by the contactor; after a group of normally open contacts of the contactor is connected with a corresponding motor starting switch in parallel, the normally open contacts are connected with a motor stopping switch corresponding to the contactor, a coil of the contactor and normally closed contacts of the contactor locked by the contactor in series and connected with a power supply;
and a pair of starting terminals of the frequency converter are respectively connected to two ends of a normally open contact on each corresponding contactor control branch.
2. The motor control circuit of claim 1, wherein: the motor starting switch is a button type normally open switch, and the motor stopping switch is a button type normally closed switch.
3. The motor control circuit of claim 1, wherein: the motor control circuit further comprises a rotary switch;
the rotary switch comprises at least two gears, each gear corresponds to at least one contactor control branch, and each contactor control branch corresponding to each gear is connected in parallel, then connected in series with the gear and connected into a power supply.
4. The motor control circuit of claim 3, wherein: the rotary switch is a two-gear rotary switch, and each gear corresponds to 3-5 contactor control branches.
5. The motor control circuit of claim 4, wherein: the motor control circuit comprises two frequency converters;
each motor corresponds to two contactors, and one motor is respectively connected with the alternating current output ends of the two corresponding frequency converters through the main contacts of the two corresponding contactors.
6. The motor control circuit of claim 5, wherein: the motor control circuit comprises 6-10 motors.
7. The motor control circuit of claim 1, wherein: the auxiliary contacts of the contactor include at least two sets of normally open contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921776749.XU CN211830632U (en) | 2019-10-22 | 2019-10-22 | Motor control circuit of shared frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921776749.XU CN211830632U (en) | 2019-10-22 | 2019-10-22 | Motor control circuit of shared frequency converter |
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| CN211830632U true CN211830632U (en) | 2020-10-30 |
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| CN201921776749.XU Active CN211830632U (en) | 2019-10-22 | 2019-10-22 | Motor control circuit of shared frequency converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114768329A (en) * | 2022-05-24 | 2022-07-22 | 景津装备股份有限公司 | Filter chamber locking and pulling plate cake unloading mechanism sharing frequency converter and cooperative working procedure thereof |
-
2019
- 2019-10-22 CN CN201921776749.XU patent/CN211830632U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114768329A (en) * | 2022-05-24 | 2022-07-22 | 景津装备股份有限公司 | Filter chamber locking and pulling plate cake unloading mechanism sharing frequency converter and cooperative working procedure thereof |
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