Starting this thread as a place to park info I am collecting for an article. I bought one of the first of these hubmotors from LA eBike (Alan Chinito Hu and Corbin Keegan).
(all stators discussed in this post are 205mm outer diameter) A year or so ago, quite a few guys had bought and tried the Leafbike 1500W. It has the thinner 0.35mm laminations, instead of the common 0.50mm. reviews widely praised its capabilities. Crystalyte had been making a popular 35mm stator motor. Works fine at rated power levels, but excessive eddy current heat at high RPM's, also axles break if you double the power and use hard regen. the Leafbike had a stronger axle, the motor phase wires came out inside the drop-outs (instead of a hollow axle). This is good for protecting the wires in a wreck, also it makes it MUCH easier to upgrade to thicker phase wires.
MXUS, Cromotor, and QS all proved there was a big benefit to having an aluminum cast stator support (instead of the common stamped steel plate). The aluminum mass that was firmly attached to the steel stator magnetic cores acted as a heat sponge. It didn't help the continuous long-term heat capability, but...it doubled the short-term amps when accelerating from a stop. After a few seconds, assuming you have attained a stable cruise speed, the amps slide back down to a much lower level, and everything has a chance to cool down.
To be clear, if you live at the base of a tall mountain, and you use full throttle all the way up the mountain, the aluminum core will DELAY the motor getting heat-soaked (using double the rated amps), but it will eventually still overheat. where the aluminum core really shines is on relatively flat land, on a street. The double amps can provide excellent acceleration in a motor that is lighter (and hopefully cheaper) than what would normally be specced.
MXUS makes an aluminum core in their 28mm wide stator, and also their famous 45mm wide stator (the 3000W rated model). QS makes one of these with a 50mm wide stator.
Both have been asked to make an aluminum core stator with a 35mm width, so a 6-speed mega-range cassette can still fit on it, with the axle shoulders fitting into common 135mm wide drop-outs. Both have declined unless some of the development costs were paid upfront, and a large minimum quantity was pre-ordered.
I don't know who LA eBike got them from, but....they had to order 100 units to get these features, and I have one. I laced it to a 19-inch MMP moped rim, and the moped tire comes out to about 24 inches OD. I am close to getting this running on 52V X 50A = 2600W
(all stators discussed in this post are 205mm outer diameter) A year or so ago, quite a few guys had bought and tried the Leafbike 1500W. It has the thinner 0.35mm laminations, instead of the common 0.50mm. reviews widely praised its capabilities. Crystalyte had been making a popular 35mm stator motor. Works fine at rated power levels, but excessive eddy current heat at high RPM's, also axles break if you double the power and use hard regen. the Leafbike had a stronger axle, the motor phase wires came out inside the drop-outs (instead of a hollow axle). This is good for protecting the wires in a wreck, also it makes it MUCH easier to upgrade to thicker phase wires.
MXUS, Cromotor, and QS all proved there was a big benefit to having an aluminum cast stator support (instead of the common stamped steel plate). The aluminum mass that was firmly attached to the steel stator magnetic cores acted as a heat sponge. It didn't help the continuous long-term heat capability, but...it doubled the short-term amps when accelerating from a stop. After a few seconds, assuming you have attained a stable cruise speed, the amps slide back down to a much lower level, and everything has a chance to cool down.
To be clear, if you live at the base of a tall mountain, and you use full throttle all the way up the mountain, the aluminum core will DELAY the motor getting heat-soaked (using double the rated amps), but it will eventually still overheat. where the aluminum core really shines is on relatively flat land, on a street. The double amps can provide excellent acceleration in a motor that is lighter (and hopefully cheaper) than what would normally be specced.
MXUS makes an aluminum core in their 28mm wide stator, and also their famous 45mm wide stator (the 3000W rated model). QS makes one of these with a 50mm wide stator.
Both have been asked to make an aluminum core stator with a 35mm width, so a 6-speed mega-range cassette can still fit on it, with the axle shoulders fitting into common 135mm wide drop-outs. Both have declined unless some of the development costs were paid upfront, and a large minimum quantity was pre-ordered.
I don't know who LA eBike got them from, but....they had to order 100 units to get these features, and I have one. I laced it to a 19-inch MMP moped rim, and the moped tire comes out to about 24 inches OD. I am close to getting this running on 52V X 50A = 2600W
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