Then…Canada, Switzerland, and Austria have a 500W power level, and many other countries have a ridiculously low 250W power level. Edit: We now have a full pictorial of a builder welding an Ultra Max shell into a frame, and you can read about it by clicking here. The quality and efficiency of the FET, and also the size of the FET has an effect on how many total max-amps can be flowed through them (without any overheating). However, it can take a 1/4 turn of the pedals to engage, and a half-second of stopped pedals to dis-engage. I don’t know anything about Exess, but they seem to be very upscale. With the older SPM motor designs, the magnet body itself becomes a source of waste heat. Welding aluminum to titanium requires experience and a TIG-welder. The outer dimensions of the Bafang or Tongsheng motor shaft are approximately 33.5mm. 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. A Bafang mid-drive motor kit will include the following components: A motor unit with integrated controller (500W or 750W) A display (DPC18, P850C, P860C, 750C, SW102, C965 or C961) The one place where you can consistently find the stronger (and more expensive) 10-spline “ISIS” format for the spindles is on serious off-road bicycles. In fact, some countries in Europe only allow PAS. Frey was an early adopter of the Bafang Ultra Max drive, as seen in the pic above. 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. “Watt Wagons” makes an upscale titanium dutch-style city bike with a Gates belt instead of a chain (to see it, click here). Even so, 12 FETs is a LOT! The Bafang Ultra Max mid-drive has the biggest motor you can buy in a factory turn-key ebike right now. This is the major clue to Bafangs philosophy about the design choices they made for the Ultra. It is affordable and it provides an interface that has a very wide global selection of cranks. They create hand-crafted electric bikes at affordable prices, with a strong focus on simplicity and minimalism, and a reputation for quality customer service post-purchase. 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 latest incarnation of the motor does pretty much everything better than its predecessors. Pic courtesy of Daxxie. The Biktrix Ultra, Biktrix is based in Canada, This ebike has a titanium frame and a Gates belt drive along with an internally Geared Hub (IGH). The affordable PAS solution is to have a “speed sensor”, where pedaling causes a disc with several embedded magnets to pass by some type of fixed magnetic sensor. The BBSHD is often run at 1500W, so the Bafang Ultra should easily be able to handle 2000W or more. The pic below shows that the factory controller for the Ultra uses 12 MOSFET’s. Thread starter Bafang … Pic courtesy of ES member Daxxie. For instance, if you are looking for an obscure offset in a pair of crank-arms, the square taper spindles (frequently found on street bicycles) will have the best selection…including cranks made of titanium, carbon fiber, aluminum, and steel. The Bafang or Tongheng mid-drive motor would not be a straightforward fit, as your bike has a FSA BB30 pressfit bottom bracket and the inner dimensions of the BB shell are 42mm. The diameter of the BBSHD would be about halfway between the two. Below is a teardown video showing the insides of the Bafang Ultra Max…, Written by Ron/spinningmagnets, January 2019, Grew up in Los Angeles California, US Navy submarine mechanic from 1977-81/SanDiego. Rev-becca demonstrates the installation of a Bafang mid-mount motor. The Bafang label claims a 1000W power level, but they are actually being run at over 2000W, and THAT…is not street legal anywhere! The Ultra is reported to allow the use of 1600W of power in the factory-authorised high-powered versions. Here is a link to his impression of the Luna 2500W Ludicrous Apex. It may not display this or other websites correctly. Using lots of small pulses ‘can’ provide the same total power that is applied, compared to using fewer long pulses, but…using long “on” pulses will heat up the MOSFET’s in the controller, and also the electromagnets in the stator. Most of them even sense the amount of pedal pressure that the rider is applying, and then it adds motor power accordingly. ___________________________________________________ So far, about, A good friend of mine, Laurence who is also, Hot Rod cruisers are a style where most people. The rotor drive has 9-Teeth, and its driven gear has 23T (both are helical-cut gears, which run quieter when using high-RPM’s), for a reduction of 2.5:1. 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. That being said, it would be easier to splice-in an external controller to use 20S / 72V, if you wanted to experiment…. One of my favorite writers is Karl from ElectricBike-Blog.com. The first thing that pops out at the casual observer is that the Ultra has a larger diameter motor. JavaScript is disabled. Volton A-Trail, Volton’s USA headquarters are in Chicago Illinois, and their bikes are manufactured in China. It makes sense. Hello to all , new member Glenn here , I have two self build kit bikes a Bafang 750 watt and a Bafang 1000 watt , both are mid mount motors. Many of these new ebikers are asking about the option of using an Internally Geared Hub (IGH), instead of a common derailleur with their external sprocket stack. Some riders feel that it is a little jerky, especially if the power assist level is set at the high end. The Bafang Ultra Max mid-drive has the biggest motor you can buy in a factory turn-key ebike right now. Testing the Bafang Ultra mid drive Motor. The BBS02 is on the left (known to run well at 1000W), with the Ultra on the right. BAFANG BBS02B 48V 750W Mid Drive Electric Bike Motor Ebike Conversion Kit Mid Motor for Mountain Bike Road Bike with Optional 48V 11.6Ah/13Ah/17.5Ah and 52V 14Ah Battery Brand: BAFANG 4.6 out of 5 stars 318 ratings Newsletter sign up. The third gearset is 46T/17T for 2.7:1 (and uses affordable straight-cut spur gear-teeth at the low-RPM end of the drive). They also have a hardtail version, and a fat tire version too. A mid motor controller which controls the different levels of pedal assist; Brake levers that safely cut off any power from the motor while stopping; This Mid drive motor kit is compatible with fat-bikes, mountain bikes ,road bikes etc. You are using an out of date browser. Not only that, it has ISIS cranks and torque-sensing, so…let’s get started. A torque-sensor is more expensive, but all of the modern versions that are readily available provide an “instant-on / instant-off” experience when you start and stop pedaling. We use cookies to ensure that we give you the best experience on our website. The other thing that this helps is the efficiency, since the “tangential magnet speed” is faster for a given RPM. If you are only running 52V X 20A = 1000W (like the label), it will barely get warm…, 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). Luna Cycles (in southern California) retails the Luna Apex with the Ultra Max drive, but they also are willing to sell, click here for “motor tech, learn the terms”, Bosch, Yamaha, Panasonic, Continental, and others, the Bafang Ultra Max by itself along with the proprietary shell (click here), Here is a link to his impression of the Luna 2500W Ludicrous Apex. The faster the magnets pass by each other, the shorter the pulses of watts are…that are applied to the electromagnets. Dump truck driver in the 2000's/SW Utah. 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. Exess, from Germany. You must log in or register to reply here. 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. And others motor / IPM everything better than its predecessors jerky, especially if power. Handle 2000W or more to Bafangs philosophy about the design choices they made for the Ultra is reported to the... 2500W Ludicrous Apex chosen to save on costs level etc for a mid drive ebike with load! 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