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来自henrym3的汽车水泵电机改造:原帖地址:http://www.rcgroups.com/forums/showthread.php?t=1702483#post22405862
基本数据:
stator outer diameter: 78.2mm
stator inner diameter: 39.8mm
stator lamination thickness: 0.35mm
stator height: 30mm
rotor height: 37mm, inner magnets height: seems to be 30mm
rotor diameter: 35.8mm
rotor structure: internal permenant magnets (IPM), 2 pieces, to form a NSNS 4-pole rotor (as shown in the attached pics)
orginal "bearing": carbon tube
original windings: 28 turns of 0.9mm wire each tooth (56T)
original driving board: unknown driving board, directed glued on the motor back
original Kv: unknown, since the winding is not clear to me, seems to be a 6N4P ABCABC, DD connection.
winding: single strand 2.24mm wire, 21T, Y
Kv: 580 rpm/v
Rm: 0.0455 ohm
Io: 1.25A@11.8V, 2.04A@23.0V
Best efficiency current based on Rm and Io: 18A@11.8V, 32A@23V
Overall weight including ESC: 1800 gram
目前用该电机带动一个自己拼的15X10的4叶桨(两个劲旋风15X10,四个叶片末端裁去了约2.5mm),11.2V,18A。
首先必须感谢henrym3提供的电机,和亲手为我打造的一把极品绕线工具,没有这把工具,我是无法完成2.24mm这么粗的线的绕线的。可谓艺术品。![](http://static.rcgroups.net/forums/attachments/3/7/3/5/2/8/a5072534-79-psb.jpg)
该电机扭矩惊人,用手感觉比我目前最大的6374的外转子还要大(5340定子尺寸,180Kv)。由于定子和转子特殊设计,该电机基本没有顿感,因此11.8V下,1/20油门便可开始缓慢平滑转动,1/10油门下,转速虽然很低,可能只有每分钟100转以内,但已基本用手(或戴皮手套)捻不住转轴,力量很大。
目前一个比较大的问题就是电机有不寻常的振动和噪音,经过测试初步判断可能是轴承的问题,希望换了EZO轴承后能解决。
总体来说,至此安装电机、测试结果均十分理想。下面是一系列图了。
An interesting calculation:
As i mentioned before, the original winding is 58T, connection type seems to be DD.
As a reference, the speed of engine cooling water pump is around 6000 -9000 rpm.
So: For my Y connection, winding constant (Yc) = Kv X number of turns = 580 X 21 = 12180
converting the Yc to DDc: DDc = Yc X 2 X 1.732 = 42192
So the original Kv is DDc/ original number of turns = 42192/58 = 727.45
Assuming the working voltage of the original pump is 12V : then the working speed is 12 X 727.45 = 8729. which is well in the range of 6000-9000.
[ 本帖最后由 modisc 于 2012-8-10 13:50 编辑 ] |
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