[introduction] although ” the sort of electric machinery ” these a few words say simple, but the development as the technology, electric machinery has become increasing appearance is changed, because this classifies a method to also present diversification trend, can wait according to domain of structure of the power source sort, principle that produces torsion, electric machinery and application undertake classified.

What sort does electric machinery have?

Although ” the sort of electric machinery ” these a few words say simple, but the development as the technology, electric machinery has become increasing appearance is changed, because this classifies a method to also present diversification trend, can wait according to domain of structure of the power source sort, principle that produces torsion, electric machinery and application undertake classified.

For example, when us basis [does torsion produce a principle] ? [Power source] ? [Structure] undertake classified, with respect to the result that can reach plan institute shows as follows:

Institute of as above plan is shown, the sort of electric machinery has a lot of, but convenient the electric machinery that is used at the electron to make is finite however. In the article, 3 kinds when for you the introduction applies to an electron to make main electric machinery reachs his to apply.

What is to have brush dc machine?

The electric machinery that in the electron the middling that make uses is ” have brush dc machine ” . Different electric machinery manufacturer is planted to this of electric machinery call a law to also differ somewhat, for instance ” DC electric machinery ” , ” dc commutator electric machinery ” , ” have brush electric machinery ” , ” dc commutator electromotor ” wait for all sorts of names.

Have brushing dc machine is a kind of electric machinery that uses easily simply, it need not prepare special electronic circuit to come drive, want to join the power source such as dry cell can rotate only. Because its use gender and low price easily, the electric machinery with the top utilization rate in making its become an electron to make.

It still can pass PWM or be called ” electric machinery driver ” control IC will adjust rotate direction of rotation of speed, setting controls apply the brake to wait, because this still is used extensively at the application such as fan of radio controller zephyr.

It is to the model that brushs dc machine controls fashion in the graph — ” H bridge circuit ” . Can pass 4 switch (it is transistor or FET actually) ON/OFF will operate freedom of electric machinery ① / ② is turning / ③ inverts / ④ apply the brake.

Although this kind of electric machinery has the advantage that uses a sex easily, but it also has a few drawback. The interior that brushs dc machine is had be called ” brush ” osculatory body, if brush turns to cause the clash that rise and wear away badly because of coming back, electric machinery will not be used. Turn a few hours do not have a problem, but if be used continuously, brush can wear away serious, change with respect to need whole electric machinery, and electric machinery cannot repeat again use.

In addition, the scintilla that contacts body brush generation also is one of causes that cause noise, below certain circumstance, having the peculiar smell that brushs the generation when dc accident goes also is very big question, accordingly, in setting of a few application, must consider other option.

Advantage

? Give report to be able to rotate
? The price is low

Defect

? The problem that brush poses (life, noise, peculiar smell)

What is to not have brush dc machine?

“Without brush dc machine ” the brush that brushs dc machine through cancelling to have, solved the corrupt practice that brush brings. Pass purify brush, cancelled the osculatory system of electric machinery interior, reduced component amount, make electric machinery is in finally can safeguard efficiency of gender, weight, life, electric machinery and high speed to rotate the function that waits for each respects got promotion, can saying is a kind of epoch-making electric machinery. This kind of electric machinery can not work to report, use rise to be bothered a bit a little, but its efficiency is tall, life is long, often be used at the equipment of batteries power supply consequently.

The electronic circuit that makes electric machinery rotates can be monitored from beginning to end with take-off (crankshaft) the corner coming back of connective rotor is spent, and according to angle at any time the electrify of switch coil. The control that the action of drive circuit brushs dc machine to notting have is very significant. Need a lot of electrons without the drive circuit that brushs dc machine yuan parts of an apparatus, include the position to detect transistor of sensor, many power and grid driver, and the small controller that controls them, because this is right circuit design skill and software knowledge demand are very high.

In recent years, deploy sheet piece engine control IC or have those who do not have the small controller that brushs dc machine to control a function to not have brush dc machine increasing also, but overall and character, be operated without what brush dc machine or brush dc machine than having complex.

Without the drive circuit that brushs dc machine. It is besides this circuit, still increased the position to detect sensor and with will had detected protective circuit of electric current, make circuit scale very large.

Carry incidentally, without the group comparison that brushs dc machine complex, because electric machinery itself is of the alternating current drive that produces by inverter, can consider to be its classify so ” alternating current machine ” , but do not have seemingly brush dc machine to be by classify more ” dc machine ” .

Advantage

? Light, life grows weight, electric machinery efficiency is good

Defect

? The price circuit of expensive, drive is complex

What is the pace enters electric machinery?

“The pace enters electric machinery ” it is the electric machinery that can dominate corner coming back to spend. Two kinds of electric machinery that introduce in front are to use as the dynamical source that rotates for long continuously, and the pace basically is used at positional control into electric machinery.

The characteristic that the pace enters electric machinery is, every bring to bear on pulse signal, take-off has turned a fixed angle. This kind of every input pulse signal and gyral angle is called ” step pitch horn ” . For example, if be the sentence that step pitch horn receives electric machinery for the pace of 1.8 ° , meeting every 200 pulse rotate circuit, because this is OK according to ” bring to bear on 100 pulse make its rotate half rounds ” , ” every second brings to bear on 1000 pulse, make its 5 turn / second ” etc undertake controlling, can very agile ground controls his to rotate speed, direction and stop the position to wait.

Because although stop in electric machinery,its maintain torsion,also meet action, because this pace also is used at need into electric machinery,secure the application that quits the position.

Be in through installation with servo electric machinery electric machinery is external servo orgnaization will come true accurate the kind that quits the position is different, the step dominates the niche into electric machinery through its interior structure, because this has a structure the characteristic with simple, high reliability. Wait for position of need high accuracy to printer of numerical control machine tool, 3D and mechanical arm pilot application, the pace already made indispensable part into electric machinery.

Need to bring to bear on only the pace that pulse can run enters electric machinery, its drive circuit is relatively simple. But, if laden torsion passes big or rotate speed is too fast, can appear lose a condition (sent pulse number is spent with corner coming back do not match) wait for a problem with noise, because this wants to make its stabilize movement, still need certain mechanical design skill.

Use drive pace to enter the driver IC of electric machinery. At first sight is very complex, what do not cross its principle to just have the H bridge circuit that brushs dc machine is outspread just. Additional, it can process pulse signal, control very easily accordingly.

Advantage

? Positional control is easy
? Have maintain torsion
? Reliability is high

Defect

? The pace rotates into type, the movement is not so smooth
? Do not suit to rotate for long with high speed continuously

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