CN205509477U - Overload and overcurrent protect device that brushless DC motor used - Google Patents
Overload and overcurrent protect device that brushless DC motor used Download PDFInfo
- Publication number
- CN205509477U CN205509477U CN201620246872.0U CN201620246872U CN205509477U CN 205509477 U CN205509477 U CN 205509477U CN 201620246872 U CN201620246872 U CN 201620246872U CN 205509477 U CN205509477 U CN 205509477U
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- circuit
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- current detection
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- Protection Of Generators And Motors (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model discloses an overload and overcurrent protect device that brushless DC motor used, including power supply circuit, drive circuit, control circuit, DC Brushless motor, current detection circuit and comparison circuit, power supply circuit is connected with drive circuit and control circuit respectively, drive circuit is connected with current detection circuit and DC Brushless motor respectively, DC Brushless motor and current detection circuit are connected, current detection circuit and comparison circuit are connected, comparison circuit and control circuit are connected, control circuit and drive circuit are connected, compare with prior art, can obtain under effectual overload and overcurrent protection's the condition at brushless DC motor, realize motor output maximize to the requirement of reliable work.
Description
[technical field]
This utility model relates to motor control technology field, and especially the overload of brshless DC motor, excessively stream are protected
Protection unit.
[background technology]
Motor as the main power resources of industrial circle, is often subject to various load shock and complex working condition
Test, so overload, the phenomenon of overcurrent often occur, so that burn-down of electric motor, for overcoming above-mentioned phenomenon,
Traditional alternating current generator is protected frequently with the electric elements such as thermorelay and temperature relay, but all exists
Error is big, react slow problem.Modern technology has employing single-chip microcomputer and amplifier combination carried out stream or
The guard method of overload, use the method can solve the error of traditional electric elements greatly, react slow problem,
But it is the most complicated to there is system simultaneously, overload signal sampling is longer, and protection act is relatively slow, and is difficult to holding concurrently
Under conditions of turning round and look at overload and overcurrent protection, it is achieved motor output maximizes, and the requirement of reliably working.
[utility model content]
The purpose of this utility model solves the problems of the prior art exactly, proposes a kind of brshless DC motor and uses
Overload and overcurrent protective device, effectively transshipped and the bar of overcurrent protection realizing brshless DC motor
Under part, it is achieved motor output maximizes, and the requirement of reliably working.
For achieving the above object, the utility model proposes the overload of a kind of brshless DC motor and cross stream guarantor
Protection unit, including power circuit, drive circuit, control circuit, DC brushless motor, current detection circuit
And comparison circuit, described power circuit is connected with drive circuit and control circuit respectively, and described drive circuit divides
Not being connected with current detection circuit and DC brushless motor, described DC brushless motor is with current detection circuit even
Connecing, described current detection circuit is connected with comparison circuit, and described comparison circuit is connected with control circuit, described
Control circuit is connected with drive circuit.
As preferably, described drive circuit is bridge drive circuit.
As preferably, the kernel control chip of described comparison circuit is operational amplifier or comparator.
As preferably, described current detection circuit and comparison circuit are analog circuit.
The beneficial effects of the utility model: current detection circuit can flow through the electric current of DC. brushless electric machine stator
Being converted to the signal of telecommunication of correspondence, and pass to comparison circuit, then current detection circuit is sent here by comparison circuit
Respectively with two default reference voltage values of current signal compare, and output overcurrent signal and overload signal
Phase is formulated to control circuit, the over-current signal sent here according to comparison circuit followed by control circuit and overload signal
The control strategy answered, thus realize brshless DC motor and effectively transshipped and under conditions of overcurrent protection,
Realize motor output to maximize, and the requirement of reliably working, and current detection circuit, comparison circuit are equal
For analog circuit, so the response speed of circuit and reliability are all good than the circuit using control chip, control
The over-current signal of comparison circuit and overload signal only need to simply be judged and count just to formulate phase by circuit
The control strategy answered, without carrying out A/D conversion or the integral operation of complexity so that control simpler and
Reliably.
Feature of the present utility model and advantage will combine accompanying drawing by embodiment and be described in detail.
[accompanying drawing explanation]
Fig. 1 is overload and the principle signal of overcurrent protective device of a kind of brshless DC motor of this utility model
Figure.
In figure: 1-power circuit, 2-drive circuit, 3-control circuit, 4-DC brushless motor, 5-electric current
Testing circuit, 6-comparison circuit.
[detailed description of the invention]
Refering to Fig. 1, the overload of a kind of brshless DC motor of this utility model and overcurrent protective device, including electricity
Source circuit 1, drive circuit 2, control circuit 3, DC brushless motor 4, current detection circuit 5 and compare
Circuit 6, described power circuit 1 is connected with drive circuit 2 and control circuit 3 respectively, described drive circuit 2
Being connected with current detection circuit 5 and DC brushless motor 4 respectively, described DC brushless motor 4 is examined with electric current
Slowdown monitoring circuit 5 connects, and described current detection circuit 5 is connected with comparison circuit 6, described comparison circuit 6 and control
Circuit 3 processed connects, and described control circuit 3 is connected with drive circuit 2, and described drive circuit 2 drives for bridge-type
Galvanic electricity road, the kernel control chip of described comparison circuit 6 is operational amplifier or comparator, and described electric current is examined
Slowdown monitoring circuit 5 and comparison circuit 6 are analog circuit.
Utility model works process:
The overload of a kind of brshless DC motor of this utility model and overcurrent protective device are in the course of the work, electric
The electric current flowing through DC brushless motor 4 stator can be converted to the signal of telecommunication of correspondence by current detection circuit 5, and passes
To comparison circuit 6, the current signal respectively and two that then current detection circuit 5 is sent here by comparison circuit 6 is pre-
If reference voltage value compare, and output overcurrent signal and overload signal are to control circuit 3, followed by control
Over-current signal and overload signal that circuit 3 processed is sent here according to comparison circuit 6 formulate corresponding control strategy, from
And realize brshless DC motor and effectively transshipped and under conditions of overcurrent protection, it is achieved motor output maximum
Change, and the requirement of reliably working.
Above-described embodiment is to explanation of the present utility model, is not to restriction of the present utility model, any to this
Scheme after utility model simple transformation belongs to protection domain of the present utility model.
Claims (4)
1. the overload of a brshless DC motor and overcurrent protective device, it is characterised in that: include power circuit (1),
Drive circuit (2), control circuit (3), DC brushless motor (4), current detection circuit (5) and ratio
Relatively circuit (6), described power circuit (1) is connected with drive circuit (2) and control circuit (3) respectively,
Described drive circuit (2) is connected with current detection circuit (5) and DC brushless motor (4) respectively, institute
State DC brushless motor (4) to be connected with current detection circuit (5), described current detection circuit (5) with
Comparison circuit (6) connects, and described comparison circuit (6) is connected with control circuit (3), described control electricity
Road (3) is connected with drive circuit (2).
The overload of a kind of brshless DC motor the most as claimed in claim 1 and overcurrent protective device, its feature exists
In: described drive circuit (2) is bridge drive circuit.
The overload of a kind of brshless DC motor the most as claimed in claim 1 and overcurrent protective device, its feature exists
In: the kernel control chip of described comparison circuit (6) is operational amplifier or comparator.
The overload of a kind of brshless DC motor the most as claimed any one in claims 1 to 3 and overcurrent protection dress
Put, it is characterised in that: described current detection circuit (5) and comparison circuit (6) are analog circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620208114 | 2016-03-18 | ||
| CN201620208114X | 2016-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205509477U true CN205509477U (en) | 2016-08-24 |
Family
ID=56734313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620246872.0U Active CN205509477U (en) | 2016-03-18 | 2016-03-28 | Overload and overcurrent protect device that brushless DC motor used |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205509477U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107503620A (en) * | 2017-10-17 | 2017-12-22 | 东莞市天纳科汽车自动化有限公司 | A kind of push rod controller |
| CN113917222A (en) * | 2021-10-13 | 2022-01-11 | 无锡金田电子有限公司 | Method for calculating overload current of direct current brushless motor and protection device |
-
2016
- 2016-03-28 CN CN201620246872.0U patent/CN205509477U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107503620A (en) * | 2017-10-17 | 2017-12-22 | 东莞市天纳科汽车自动化有限公司 | A kind of push rod controller |
| CN113917222A (en) * | 2021-10-13 | 2022-01-11 | 无锡金田电子有限公司 | Method for calculating overload current of direct current brushless motor and protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |