Bafang Ultra Max, the new big dog on the porch

January 14, 2019
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在八方超最大中旬驱动器有,你可以在工厂交钥匙电动自行车购买目前最大的电动机。它被标记为1,000W驱动器,但是......它能够多。不仅如此,它有ISIS曲柄和扭矩感应,所以...让我们开始吧。


马达

Bafangs内贴标系统调用的MM G510.1000这一点,它的设计使得在我最喜欢的车程多次改进,该BBSHD。该BBSHD是一个工具包,滑入几乎任何你喜欢的框架,但超最大需要专有的外壳安装它(见下文)。

The first thing that pops out at the casual observer is that the Ultra has a larger diameter motor. This increases the amount of leverage that the magnets exert onto spinning the rotor, without any additional watts applied to it, compared to the same watts being applied to a smaller diameter motor with the same copper mass. The other thing that this helps is the efficiency, since the “tangential magnet speed” is faster for a given RPM.

该BBS02在左边(已知在1000W运行良好),与超右侧。该BBSHD的直径将在两者之间大约一半是。该BBSHD通常在1500W运行,所以八方超应该能够轻松地处理2000W以上。定子具有12个浓缩线圈,并且该转子具有8个磁体(4极对)。无尽的球员Ivanovich_k的PIC礼貌

这意味着…控制器将apply higher amps to the electromagnets in the stator until the permanent magnets in the rotor are spinning fast enough to reach the motors’ top-speed, the so-called “Kv” of the winding (点击这里了解“电机技术,了解这些条款”)。

越快磁体路过彼此,较短的瓦的脉冲是...被施加到电磁体。使用大量小脉冲的“可以”提供应用,相较于使用较少的长脉冲相同的总功率,但是...用长“的”脉冲将升温MOSFET的控制器,也电磁铁的定子。

要知道超最大定子比BBSHD窄,但直径大,以至于它仍然有更多的铜块。

Another thing that is worth noting is that the BBS02 in the picture above uses what’s called “Surface Permanent Magnets” / SPM on the rotor, and the Ultra (along with the BBSHD) uses a style that inserts the magnets a small distance away from the surface of the rotor. This style is being seen more often these days, and it’s called an “Interior Permanent Magnet” motor / IPM.

This design allows the magnets to run cooler, which is important because one of the limitations on how many amps a motor can use is the heat that is generated by “eddy currents”. The stator core is made from a stack of very thin steel plates in order to reduce eddy currents, which are generated anytime a ferrous metal is rapidly passed through a magnetic field.

使用的定子铁心,其由薄的层合板(涂有漆从其他电隔离一个板)制成的具有成本效益的方式来完成任何涡电流发热的限制,但是...不像定子层叠芯中,磁体是金属的固体块。与旧的SPM电动机设计中,磁铁素体本身变成废物热源。

With an IPM, the permanent magnets will “magnetize” the slim section of steel between them and the electromagnets in the stator. This keeps the magnetic field strength in the air-gap at an acceptable level, while still placing the actual permanent magnets a short distance away from the air-gap. Permanent magnets can lose their magnetic power if they get too hot, so…by doing this, you can use more “temporary peak” amps without overheating the magnets.


ISIS曲柄,没有方孔

自行车锭非常常见的“正方形锥度”柄适合于BBS02。这是负担得起的,它提供了具有曲柄的一个非常广泛的全球性选择的接口。例如,如果你正在寻找一个晦涩在一对曲轴臂的偏移,所述方锥形主轴(经常在街道自行车找到)具有将最好的选择...包括由钛制成曲柄,碳纤维,铝和钢。

Square taper spindle on the left, and a 10-spline ISIS spindle on the right.

The BBSHD also uses a square tapered spindle, which I believe was simply chosen to save on costs. When comparing the BBS02 to the BBSHD, it was obvious to me (years ago) that the larger BBSHD would be the drive of choice for off-roaders (off-road is where there are no power limits in many countries).

在一个地方,你可以找到一致的更强(更贵)10样条“ISIS”为主轴的格式是严重的越野自行车。这是主要的线索Bafangs哲学关于设计的选择,他们的超发。

For instance, when it comes to a “street legal” electric bike, the USA has a 750W power limit. Then…Canada, Switzerland, and Austria have a 500W power level, and many other countries have a ridiculously low 250W power level. The Bafang label claims a 1000W power level, but they are actually being run at over 2000W, and THAT…is not street legal anywhere!

[编辑:愤怒的电子邮件已经通知我,俄勒冈州和弗吉尼亚州有1,000W的街道法律功率限制]


扭矩感应式

我没有一个活泼的图片来说明扭矩感应式,但它应该只需要几个段落来解释。最“踏板辅助传感器-PAS”设计让自行车通过,当你踩下(无手油门)简单地感知补充电能。事实上,一些欧洲国家只允许PAS。

经济实惠的PAS的解决方案是有一个“速度传感器”,其中蹬踏引起的盘具有多个埋入磁铁通过某种类型的固定磁性传感器的通过。但是,它可以采取1/4圈踏板的参与,并停止了对踏板的半秒DIS搞。一些车友认为这是一个有点生涩,尤其是在动力辅助级别设置为高端。

扭矩传感器比较昂贵,但所有的现代版本都是现成的,当你开始和停止踩踏提供“即时接通/即时客”的体验。他们中的大多数,即使感测踏板压力的使得骑车者在施加量,然后将其相应地增加了电机的功率。谁喜欢这个?越野车。

嗯,其实......每个人都喜欢它,但...越野车一贯愿意支付更多的钱。这说得通。如果你是在一个微妙的平衡上的困难的越野障碍,瞬间响应蹬踏具有平滑辊上而无需转移注意力到一个手油门是执行的最好方式的技术部分一个艰难的岩石爬行伎俩。


Controller

The pic below shows that the factory controller for the Ultra uses 12 MOSFET’s. A Field Effect Transistor / FET is an “on-off” switch that controls the amps that are fed to the three phases of the motor.

The controller for the Ultra Max. Notice the “63V” capacitor. This drive can use the 58.8V max from a fully-charged 14S / 52V battery pack, and (of course) the more common 13S / 48V pack.

质量和FET的效率,并且还FET的大小对多少总最大放大器可以通过它们流过的效果(没有任何过热)。即便如此,12个场效应管是很多!如果你只运行52V 20A X = 1000W(如标签),它会勉强得到温暖......

Side note…the fact that the controller is not “potted” (not covered in a firm waterproof goo) means that it wouldn’t be too hard to upgrade the FETs to higher efficiency (meaning less waste-heat for the same watts), or higher voltage (along with higher voltage capacitors). That being said, it would be easier to splice-in an external controller to use 20S / 72V, if you wanted to experiment…


Gear Reduction

电动机的Kv是每伏55-RPM的,并且电机和曲柄之间的三重减少是18:1。附加传动装置可以在曲柄和后轮之间使用。

转子驱动器具有9齿,其从动齿轮具有23T(均为斜齿齿轮,其使用高RPM的时运行更安静),用于减少2.5:1。第二螺旋齿轮组是66T / 25T为2.6:1。第三齿轮组为2.7 46T / 17T:1(以及在驱动器的低RPM的最终用途实惠直切正齿轮齿)。

有还原的多个阶段将花费更多,增加了复杂性,增加质量,并增加摩擦。然而,它也可以允许驱动系统以提供更高的车轮扭矩与电机的相同的大小。robocam的PIC礼貌。

This builder has removed the stock controller and is trying to fit a controller model called a “Phaserunner”. If you don’t have a grease preference when re-assembling, Mobil-28 synthetic is my go-to option. Pic courtesy of ES member Daxxie.


该专有接口

The benefit of a conventional mid-drive kit is that it can slide into the “bottom bracket” of almost any bicycle frame that you like. The drawback is that it limits the arrangement and sizes of various components inside the drive. Proprietary drives have much more design freedom.

最流行的工厂中期驱动器是Bosch, Yamaha, Panasonic, Continental, and others

This builder found a titanium frame that uses the Bafang Ultra Max mounting shell. Welding aluminum to titanium requires experience and a TIG-welder. Pic courtesy of Daxxie.

红月周期(南加州)的零售价月神先端具超最大的车程,但他们也愿意卖在八方超最多由它自己专有的外壳沿(点击这里),so custom builders can weld it into an aluminum frame of their choice. Do your homework before purchasing the shell. I believe it is aluminum, which may restrict the frames that can accept it…

的八方超最大值,当购买作为距离Luna循环的单独的单元

编辑:我们现在有一个建设者焊接超最大外壳为框架的完整图案,并您可以点击这里阅读它


What ebikes have it?

The Bafang Ultra Max was first shown at the Taipei bicycle show in 2017, and it was marketed as being more powerful and less expensive than the popular Bosch mid drive.

The 27.5-inch tire version of the Frey full suspension frame.

Frey was an early adopter of the Bafang Ultra Max drive, as seen in the pic above. They also have a hardtail version, and a fat tire version too. The Ultra is reported to allow the use of 1600W of power in the factory-authorised high-powered versions. It is reported to provide160-NM的扭矩,并且还提供了功率高达28-MPH(45公里/小时),这是巧合在美国街道法律功率应用限制。

(The most powerful Bosch mid-drive is listed as providing90-Nm扭矩,以及最近的“TQ”中驱动被列为120-NM

Exess,来自德国。我不知道什么Exess,但他们似乎很高档。

Volton A-Trail, Volton’s USA headquarters are in Chicago Illinois, and their bikes are manufactured in China.

该Biktrix超,Biktrix总部设在加拿大

这种电动自行车具有钛帧并用内装变速轮毂(IGH)沿盖茨皮带驱动

“瓦货车”,使一个高档的钛荷兰风格的城市自行车与盖茨皮带代替链(to see it, click here)。

Luna Apex

我们的大多数读者都设在美国,如果他们中的一个人想看看可能购买与八方超最大中旬驱动的电动自行车,在南加州月神周期应该是您的第一站。它出现在高档的顶点,并且也更便宜的阿波罗。要知道,当月亮有他们的股票,他们往往很快得到抢购一空。

我最喜欢的作家是卡尔从ElectricBike-Blog.com。Here is a link to his impression of the Luna 2500W Ludicrous Apex

Over time, I believe more retailers will begin carrying a model of ebike with the Bafang Ultra Max mid-drive, and as I find them, I will add some to this list. Below is a teardown video showing the insides of the Bafang Ultra Max…


Written by Ron/spinningmagnets, January 2019

在加利福尼亚州洛杉矶,从1977年至1981年/美国圣迭戈海军潜艇机械师长大。在1980年的液压技工/洛杉矶。重型设备操作员在1990年/前往不同地点。自卸车司机在2000年代/ SW犹他州。目前,由于2010 / NW堪萨斯州水厂运营商


17条评论

  1. “举例来说,当它涉及到一个‘街头合法’电动自行车,美国拥有750W功率极限”

    This is not true. In Virginia the max for an ebike is 1000W. That law you keep quoting is a consumer product safety recommended max for sale. Each State sets its own limits for use on it’s roads.

    https://www.electricvehiclemall.com/skin/downloads/Virginia_E-Bike_Law.pdf

    • I thought 750 was the federal limit.

  2. 没有!每个国家将它自己的极限。在VA它的千瓦特和35英里每小时与1500W电动自行车和35英里每小时的e-滑板车

  3. Georgia has a 1000W limit as well but only a 20 mph speed limit

  4. 谢谢你的更新内容非常丰富。我把Befang BBSHD 1000 Watt with a 52 volt battery pack on a old Giant mountain bike and am enjoying it very much. 45kmph is a piece of cake

    • 如何是一个古老的帧兼容安装电机?

  5. As the title of this article implies, never take this sucker out. Leave it on the porch.

    俗话说,“有和门廊上的大狗或逗留运行”。

    This thing is illegal in many states and gives ebikes a bad name. Especially since you can’t get assistance when something breaks unless you’re up at 1am and are fluent in Chinese.

    Besides the fact that they feel the need to crest over 1500w due to the fact that their motor is inefficient and doesn’t output as much torque as some 250w mid drive systems.

    This type of motor system is damaging to the municipal acceptance of ebikes nationwide and should be covered as such.

    这是我的两分钱至少...

    谢谢你来我的TED演讲。

    steps off soap box

    • Or people like you will unleash their authoritarian way of life and try to control us.. Your laws are meaningless. I will take this out and ride it wherever and whenever I wish. I will go fast if I wish, just like I have control and you don’t over what I do with my car. I know you would like to control that too but sorry..

    • Laws are made to limit ctivity and give “rights” to certain people to make money if they bribe the politicians enough, like PHANTOM DRONES who sold out to Gov to allow access to their data to log every flight wherever you fly.
      构建自己的,然后把它的标签,上面写着500瓦特。
      他们的业务没有什么我们运行。我的财产,留过。

      • When the power goes down,and there is no electricity for 18 months, no one will care what power you are running on your bike.

  6. 车电机可以做这样的方式wayyyy超速但能力是存在的,我们需要对自行车强大的马达柜面我们拖小型车像Holdens的出水沟,甚至移动已经越过道路倒下的大树干,所以,,,电源偷看!

  7. 明尼苏达州的电动自行车限制也是千瓦特。明尼阿波利斯是专为独立的车道,街道和公园路的街道之前耕种的雪地自行车交通。下车气体和不判断。

  8. I just bought a MOAR ebike with this motor and the nylon gear failed immediately. I checked the blog for the bikes and there have been many failures, so it isn’t a minimal issue. Bafang, however, sent me a new motor. Must have 16 spline 44mm deep socket to remove bottom bracket locknut which is almost impossible to find. So, good luck!

  9. 好。但你在哪里买八方M620在欧洲???

  10. 一对夫妇挑剔的。你永远不能焊接铝钛与任何类型的焊机。至于电容器的额定电压应作为一个经验法则运行双系统电压。因此,一个48或52V系统应具有100V额定上限。这样做是为了使瓶盖不会死的早。

    • You CAN In fact weld these two metals together!

  11. Incredible review, thank you so much for all the effort put into this post!

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