CN202651758U - Three-phase asynchronous alternating current motor protection circuit - Google Patents
Three-phase asynchronous alternating current motor protection circuit Download PDFInfo
- Publication number
- CN202651758U CN202651758U CN 201220140077 CN201220140077U CN202651758U CN 202651758 U CN202651758 U CN 202651758U CN 201220140077 CN201220140077 CN 201220140077 CN 201220140077 U CN201220140077 U CN 201220140077U CN 202651758 U CN202651758 U CN 202651758U
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- fuse
- motor
- rated current
- relay
- time
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Abstract
The utility model discloses a three-phase asynchronous alternating current motor protection circuit which comprises a main circuit and a control circuit. The main circuit is connected with a first fuse and a second fuse. The second fuse is connected in parallel with the first fuse. The rated current of the first fuse is equal to the rated current of a motor in normal operation. The sum of the rated current of the first fuse and the second fuse is equal to the current of the starting motor. The control circuit is connected with a switch relay and a time relay. A contact of the time relay is inserted in series into a coil circuit of the switch relay. A contact of the switch relay is inserted in series into a circuit of the second fuse. The timing time of the time relay is equal to the starting time of the motor. Compared with the prior art, according to the embodiment of the utility model, the starting stage and the normal operation stage of the motor are respectively protected, which is conducive to the protection of the motor in operation under the state of the rated current.
Description
Technical field
The utility model belongs to the Motor Control technical field, is specifically related to a kind of phase asynchronous protecting AC motor circuit.
Background technology
Three-phase AC asynchronous motor is simple in structure because of it, be convenient to the advantage such as control, is widely used in the industrial automatic control field, is used for the Electric Traction to variant type load.In its use procedure, often adopt major loop series connection fuse mode to its transship, the protection of the faults such as phase shortage, short circuit.Yet the starting current of three characteristics of the middle term alternating current motor is more much larger than rated current; blow fuse when preventing motor starting; when selecting fuse; selected fuse rated current is generally more than 2.5 times of motor rated current, will be unfavorable for like this motor protection in the running under the rated current state.
The utility model content
The main technical problems to be solved in the utility model provides a kind of phase asynchronous protecting AC motor circuit, is conducive to motor protection in the running under the rated current state.
For solving the problems of the technologies described above, the utility model provides a kind of phase asynchronous protecting AC motor circuit, comprise major loop and control loop, described major loop is connected with the first fuse and the second fuse, described the second fuse and described the first fuse are connected in parallel, the rated current that the rated current of described the first fuse equals motor when normally moving, the electric current when the rated current sum of described the first fuse and the second fuse equals motor starting; Described control loop is connected with switch relay and the time relay, the contact of the described time relay seals in the wire loop of switch relay, the contact of switch relay seals in the loop of described the second fuse, and the timing time of the described time relay equals the start-up time of motor.
Compared with prior art, the utility model embodiment provides passes through motor starting stage and normal operating phase are protected respectively, is conducive to motor protection in the running under the rated current state.
Description of drawings
A kind of phase asynchronous protecting AC motor circuit theory diagrams that Fig. 1 provides for the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples the utility model is described in further detail.
See also shown in Figure 1, a kind of phase asynchronous protecting AC motor circuit theory diagrams that Fig. 1 provides for the utility model embodiment.This protective circuit comprises major loop and control loop; major loop is connected with the first fuse FU1 and the second fuse FU2; the second fuse FU2 and described the first fuse FU1 are connected in parallel; the rated current that the rated current of the first fuse FU1 equals motor when normally moving, the electric current when the rated current sum of the first fuse FU1 and the second fuse FU2 equals motor starting.
Control loop is connected with switch relay KM2 and time relay KT, the contact of time relay KT seals in the wire loop of switch relay KM2, the contact of switch relay KM2 seals in the loop of the second fuse FU2, and the timing time of time relay KT equals the start-up time of motor.After motor starting is complete; the normally-closed contact of time relay KT disconnects; the wire loop dead electricity of switch relay KM2 disconnects; the contact of switch relay KM2 disconnects; the second fuse FU2 loop dead electricity disconnects; only stay the first fuse FU1 that the rated current when normally moving with motor adapts and be connected in the major loop, be conducive to like this motor protection in the running under the rated current state.
Above content is in conjunction with concrete execution mode further detailed description of the utility model, can not assert that implementation of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (1)
1. phase asynchronous protecting AC motor circuit, comprise major loop and control loop, it is characterized in that, described major loop is connected with the first fuse and the second fuse, described the second fuse and described the first fuse are connected in parallel, the rated current that the rated current of described the first fuse equals motor when normally moving, the electric current when the rated current sum of described the first fuse and the second fuse equals motor starting; Described control loop is connected with switch relay and the time relay, the contact of the described time relay seals in the wire loop of switch relay, the contact of switch relay seals in the loop of described the second fuse, and the timing time of the described time relay equals the start-up time of motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220140077 CN202651758U (en) | 2012-04-05 | 2012-04-05 | Three-phase asynchronous alternating current motor protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220140077 CN202651758U (en) | 2012-04-05 | 2012-04-05 | Three-phase asynchronous alternating current motor protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202651758U true CN202651758U (en) | 2013-01-02 |
Family
ID=47420803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220140077 Expired - Lifetime CN202651758U (en) | 2012-04-05 | 2012-04-05 | Three-phase asynchronous alternating current motor protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202651758U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106899007A (en) * | 2015-12-17 | 2017-06-27 | 上海船舶研究设计院 | A kind of fractional electric motor control and protection system |
-
2012
- 2012-04-05 CN CN 201220140077 patent/CN202651758U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106899007A (en) * | 2015-12-17 | 2017-06-27 | 上海船舶研究设计院 | A kind of fractional electric motor control and protection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130102 |
|
| CX01 | Expiry of patent term |