RC EVOLUTION - 遙控工房 - 香港RC遙控車討論區

標題: 炭刷一問 [打印本頁]

作者: ansonlau 時間: 2009-2-11 22:46
標題: 炭刷一問
請問各位師兄個炭刷要換未 ?

作者: kiev 時間: 2009-2-11 22:54
sure la ~~~

但有冇淨換刷先 ?

作者: Wayne~~ 時間: 2009-2-11 23:05
要換架喇~~!

作者: 仲哥仔 時間: 2009-2-11 23:34
换啦！！接受吾到啊。

作者: 啊永 時間: 2009-2-12 02:05
標題: 回復 1# 的帖子
比我早就换了,甘样会影响驾驶的

作者: billy86che 時間: 2009-2-12 08:24
You can achieve a better result if you use 2 of the one shown on picture DSC_0705 because it can ensure a correct angle of the point of contact with the commutator. That is, if you buy one pack of ATX brushes which contains 2 pairs, you use those for the positive pole. The negative brushes can be reserved for later use because the tip of the brush can be removed and replaced.

[ 本帖最後由 billy86che 於 2009-2-12 09:15 編輯 ]

作者: 2slow 時間: 2009-2-12 10:18

原帖由 billy86che 於 2009-2-12 08:24 發表

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You can achieve a better result if you use 2 of the one shown on picture DSC_0705 because it can ensure a correct angle of the point of contact with the commutator. That is, if you buy one pack of ATX ...

Do you mean using both positive brushes? can you elaborate more? thanks

作者: billy86che 時間: 2009-2-12 11:18

原帖由 2slow 於 2009-2-12 10:18 發表

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Do you mean using both positive brushes? can you elaborate more? thanks

Your first question: Yes, I meant that.
Your Second question: What do you want me to elaborate?

作者: scalpel 時間: 2009-2-12 12:23

原帖由 billy86che 於 2009-2-12 08:24 發表

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You can achieve a better result if you use 2 of the one shown on picture DSC_0705 because it can ensure a correct angle of the point of contact with the commutator. That is, if you buy one pack of ATX ...

You mean take the 2 positive brushes from the 2 pair of brushes? Then put them on positive side and negative side on the motor?

作者: 2slow 時間: 2009-2-12 12:43

原帖由 billy86che 於 2009-2-12 11:18 發表

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Your first question: Yes, I meant that.
Your Second question: What do you want me to elaborate?

elaborate on how does this help on the motor's performance? I mean the correct angle thing?
and on how will the brushes looks like? do you have any photo? coz I wanna try it~ thanks

作者: billy86che 時間: 2009-2-12 13:38

原帖由 scalpel 於 2009-2-12 12:23 發表

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You mean take the 2 positive brushes from the 2 pair of brushes? Then put them on positive side and negative side on the motor?

Exactly. Of course you have to solder the wire to one of the brushes on another point.

作者: scalpel 時間: 2009-2-12 14:17

原帖由 billy86che 於 2009-2-12 13:38 發表

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Exactly. Of course you have to solder the wire to one of the brushes on another point.

Oh! That's what I am doing already!

When the brushes wear out, then u can take the brushes off from the spare -ve brushes....then put them back onto the current +ve and +ve end....

[ 本帖最後由 scalpel 於 2009-2-12 14:20 編輯 ]

作者: billy86che 時間: 2009-2-12 14:31

原帖由 2slow 於 2009-2-12 12:43 發表

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elaborate on how does this help on the motor's performance? I mean the correct angle thing?
and on how will the brushes looks like? do you have any photo? coz I wanna try it~ thanks

Here it is:

作者: scalpel 時間: 2009-2-12 14:44

原帖由 billy86che 於 2009-2-12 14:31 發表

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Here it is:

That's it, thanks for your explanation!

作者: 2slow 時間: 2009-2-12 14:47

原帖由 billy86che 於 2009-2-12 14:31 發表

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Here it is:

I see, just what I'm expecting to see, brushes in a "69" position...

thanks

how about the magnets? any twist or tricks on the magnets too? Specially in relation with the brush trick

[ 本帖最後由 2slow 於 2009-2-12 14:49 編輯 ]

作者: billy86che 時間: 2009-2-12 22:34

原帖由 2slow 於 2009-2-12 14:47 發表

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I see, just what I'm expecting to see, brushes in a "69" position... thanks

how about the magnets? any twist or tricks on the magnets too? Specially in relation with the brush trick

Not much, just 2 if you are using silver magnets:
1. They can be weakened if overheated. Sometimes I prefer weaker silver magnets if the straights are long.
2. If the magnets are not strong enough, add some double-sided tapes between the magnets and the motor case to reduce their distance from the rotor. It raises the torque to a certain extent.

作者: ansonlau 時間: 2009-2-13 09:17
好多謝各位師兄回覆同o甘多寶貴意見

Billy 師兄, 好多謝你教o左我 lee 個方法, 小弟新手一名正於摸索嘗試中

作者: 2slow 時間: 2009-2-13 09:25

原帖由 billy86che 於 2009-2-12 22:34 發表

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Not much, just 2 if you are using silver magnets:
1. They can be weakened if overheated. Sometimes I prefer weaker silver magnets if the straights are long.
2. If the magnets are not strong enou ...

Thanks Billy for the tips and answering my doubts...

1. trying to figure why the weaker magnets for long straights, is that it provides less drag? sure it does affects the momentum of the car but then the torgue could be lessen too, right?
2. Mmm.. I should try this one. by the way, I'm not sure if the 2 magnets in the motors have different poles, how about reversing the magnets? does it helps?

作者: billy86che 時間: 2009-2-13 09:40

原帖由 2slow 於 2009-2-13 09:25 發表

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Thanks Billy for the tips and answering my doubts...
1. trying to figure why the weaker magnets for long straights, is that it provides less drag? sure it does affects the momentum of the car ...

Reversing the magnets without doing other things reverse the spinning direction of the rotor. People do that sometimes because they "re-wind" the rotor in another direction. Most motors sold are winded "anti-clockwisely", so the red magnet is usually on the right if you remove the endbell and look inside. So if some winds the motor "clockwisely", they may either trade the position of the magnets or the wires.

作者: 2slow 時間: 2009-2-13 10:47

原帖由 billy86che 於 2009-2-13 09:40 發表

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Reversing the magnets without doing other things reverse the spinning direction of the rotor. People do that sometimes because they "re-wind" the rotor in another direction. Most motors sold are w ...

Mmm..so it merely reverse the spinning direction, no improvements on the motor..

作者: billy86che 時間: 2009-2-13 14:30

原帖由 2slow 於 2009-2-13 10:47 發表

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Mmm..so it merely reverse the spinning direction, no improvements on the motor..

What did you expect?

作者: 2slow 時間: 2009-2-13 15:19

原帖由 billy86che 於 2009-2-13 14:30 發表

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What did you expect?

well.. I expect some performance improvements, as I've heard from someone/somewhere...

作者: billy86che 時間: 2009-2-13 15:44

原帖由 2slow 於 2009-2-13 15:19 發表

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well.. I expect some performance improvements, as I've heard from someone/somewhere...

All I know:
Unlike other parts in a motor, suitable magnets can only bring out the best of the motor and bad ones slow it down. Don't expect them to suddenly help your car run like a rocket. If you really wish a breakthrough in the speed and runtime, you should spend more time on some other things like:
1. changing to a rotor of a different design and materials
2. rewinding a rotor
3. changing and polishing the commutator
4. trying different brushes
5. setting the right timing
6. replace the bearings
7. ensure the rotor is not pushing any of the bearings...

Among all these, no 1 and 2 are on top priority.

[ 本帖最後由 billy86che 於 2009-2-13 15:46 編輯 ]

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