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Protective elements for powering dc motors

C

Thread Starter

Capitankl

加入ed Mar 8, 2021
3
Hi everyone!

我正在建造一个机器人,该机器人载有一个钻头,以在地面上打孔。我找不到有关如何为电动机供电的相似尺寸/功率参考。我想知道如何保护电池和电动机,我的具体问题是:
- Where to place fuses.
- 如果需要控制电压或电池/电机驱动器可以吸收由

我正在运行7个电动机,所有电动机全部24V,除了最后一个电动机,除了最后一个电动机
4 for the wheels, 36 amp max
1钻,19.2安培最大
1上下移动钻头,2.1 A
1将钻头移到侧面,1.5 a -stepper电动机

我将使用3或4个具有过电流保护的电动机驱动器,并且电压底电压防压。

电池是24V 100AH锂离子。

因此,我有一个电池,电动机和电动机。保险丝应该去哪里?
The actual size of the fuses I will decide when I will be able to test how much current the motors are drawing in the operation or in max load situations.
我想念另一个元素吗?我听说使用了分流器调节器,但也许电动机驱动程序已经可以处理。可以直接将所有电动机驱动程序连接到电池,或者使用保险丝限制最大电流是可以的吗?例如,如果他们可以共享超负荷,我会迷路。.我发现的大多数项目都只有一个电动机驱动程序。

非常感谢
卡洛斯


电气配置
MaxHeadRoom

MaxHeadRoom

加入2013年7月18日
22,522
您可以在每个驱动器电源线(即每个分离器之后)中的每个DC进料中放置任何熔断。
最大限度。
LowQCab

LowQCab

加入ed Nov 6, 2012
269
Fuses are fine for Fire protection, but the Motors should be individually protected by
"Electronic-Fuses" and PWM-Current Limiting Circuitry.

If the Electronic-Fuses or other Current-Limiting measures should fail, or,
某些东西会导致任何重型电池接线的直接转换,
The Fuses will prevent a complete melt-down-FIRE.

电动机需要温度保护,
not so much Peak-Current-Protection.
The Motors can withstand "Short-Term" "Locked-Rotor" Current-Draw for very short times,
在某些情况下实际上可能需要这。

As an example .........
Let's say that the Machine is drilling a hole, and runs into a rock, which locks-up the Drill-Motor,
this will cause the Current to spike-up very high.
这很容易弹出保险丝,
but what needs to happen, is that when the Current Spikes-up over a set-level,
假设0.5秒的电动机应立即逆转方向
〜2秒钟,然后恢复向前。
这可以重复直到电动机达到指定的温度,此时,
all Power to the Motor will be stopped until the Motor cools-down.

我要说的是,
电动机不一定应受到绝对的“一次性”保险丝的保护,
但应由温度传感器 / PWM限制方案进行保护。

Fuses will simply cause the mission to FAIL miserably, possibly leaving the device stuck in place.

这是一些非常不错的功率分布/保险丝块.........
https://www.delcity.net/store/MEGA-Fuse-Holders/p_795652.h_795653
https://www.waytekwire.com/products/1612/Fuse-Blocks/&Current-Rating=300A


300A 5位置LMG Mega保险丝支架46030 Waytek $ 38.00 .png
C

Thread Starter

Capitankl

加入ed Mar 8, 2021
3
现在解决方案:
1.Having a main fuseto avoid any dangerous short circuit and fire. The fuse will be sized according to the maximum consumption process (In my case when the robot is moving uphill, only using the 4 wheel motors).
由于这是一个原型版本,因此我们将有时间监督其操作,因此如果失败,我们可以更改保险丝。
I will solve this soon by getting an automatic fuse. Ideally, this automatic fuse pops only if there is a short circuit and not in a jam or in a problem because of the operation. Thanks@LowQCab对于指南。

2.Fuses after splitter:
- The wheels could draw 36x4=144A, the wheel drivers 30x2x2=120A, and the battery can output max 100A. So maybe a fuse is not necessary but a mechanism to recognize and respond quickly if a wheel gets stuck. Can the battery deliver more than the specified current as "max output current"? So here I am assuming that the answer for that is no.
- 微杆驱动程序将相应融合,假设5 amp(?)
- 电机驱动器2x20也将融合。在操作中测量后,我将分享这些值。谢谢@maxheadroom
Fuse blocks seem a bit expensive for our prototype I will just separate those components.

3.Jam/Overcurrent sensors:I will add hall sensors and amp meters to check if motors are stuck or overdrawing current. We have also end-of-run sensors (but they wouldn't know instantly if something went wrong). So this will be followed by routines to retry or abort operations in case of finding big rocks either in the path of the robot or when it digs.

Thank you all for your help!!
LowQCab

LowQCab

加入ed Nov 6, 2012
269
锂离子电池可以弹出(猜测),
around ~6 to ~10 Times its Amp-Hour Rating without even blinking an eye.
是的,直接缩短的是〜1000安培。
当心。


C

Thread Starter

Capitankl

加入ed Mar 8, 2021
3
锂离子电池可以弹出(猜测),
around ~6 to ~10 Times its Amp-Hour Rating without even blinking an eye.
是的,直接缩短的是〜1000安培。
当心。


是的,锂离子。我从datasheet。不过,我不知道电池是否可以输出更多,我可以拥有那些1000A的灯光。我在数据表中没有找到“最大排放率”之类的东西。

1615370961657.png
Last edited:
LowQCab

LowQCab

加入ed Nov 6, 2012
269
“峰值 - 递送电流”不是绝对最大等级,而是
this is the Maximum-Peak-Current that the Battery is designed to deal with on a routine basis,
with little, or no, deleterious effects to the Life-Expectancy of Battery.
该评级通常基于生成的内部热量
at that stated "Peak" Discharge-Rate.
Notice that it gives a Time-Limit of ~2-Seconds,
that's because HEAT is being generated faster than it can be dissipated.

You can bet that the Peak "Short-Circuit" Current is over ~1000 Amps.
This kind of Current can turn a 2-Gauge Battery-Cable into
几秒钟内即兴的轻蛋白丝。
这不是一个玩笑。


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