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Apr 18, 2024
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The mid-drive motor features an unusual, concentric design.
Component maker SRAM has applied for a patent for a new compact motor and battery unit that would present a different approach to e-bike design. The design would use a mid-drive motor and considering the number of cells held in the casing (29 in the illustration above), it is likely to be a relatively low-wattage motor.
There are several features of this design that are notable. First is the fact that the entire motor is concentric with the bottom bracket spindle, making it one of the most compact designs we’ve seen.
By housing the battery cells in the drive unit, SRAM is able to help keep the center of gravity as low as possible. The battery unit is intended to be removable and will be charged either with a DC charger or by a USB-C cable.
Considering the overall size of the motor, and how effective mid-drive motors are, as well as the number of cells employed, our hunch is that the nominal output for the motor would be between 200W and 300W and it would produce in the neighborhood of 50Nm of torque.
If those estimates bear out, this drive and battery unit would likely be destined for more lightweight eMTBs aimed at relatively fit riders who are looking for a bit of assistance, not for the motor to do the lion’s share of the work.
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#SRAM #Patents #Compact #Motor #Battery #Unit
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