E-Wheel(TM) - The New Generation of Pedal Electric Cycles (Pedelecs): An Integrated Electric Wheel based on all-in-one idea

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Chapter 3.7 Bearing:
When the first bicycle appears to have been invented by Leonardo da Vinci [James McGurn, An Illustrated History of Cycling, John Murray Publishers, London, 1987. T.A Harris, Rolling Bearing Analysis, 1991 John Wiley & Sons], who also appears to have invented the first ball bearing. However, it took the 1800's industrial revolution and its capability to precisely work metal on a large commercial scale to make bikes ubiquitous.
As the same with this case, the design of E-Wheel(TM) come standard with the simplest, hence lowest cost, 61902 (or 6902-2rs) fully sealed 440C Stainless Steel cartridge bearings, from SKF Corporation, using 440C Stainless Steel to resist moisture, corrosion and abrasion, and for their suitability for high speeds operation.
To work effectively, interference fits between the outer ring and the hub must be applied, which mean the outer is pressed securely into the hub shell and the inner raceway must be held securely between shoulders on the axle and tightened locknuts. At the same time, the inner and outer raceways must be aligned so that the balls run in the center of the raceways.
Interference fits in general only provide sufficient resistance to axial movement of a bearing on its seating when no axial forces are to be transmitted and the only requirement is that lateral movement of the ring should be prevented. Positive axial location or locking is necessary in all other cases. To prevent axial movement in either direction of a locating bearing it must be located at both sides.
Chapter 4:BLDC Motor Controller Design:
Chapter 4.1 Design Strategy and Goals:
This chapter presents a apply-oriented solution for control of brushless DC motor for E-Wheel(TM) using microcontrollers and integrated circuit from a leading brand, Texas Instruments Incorporated, that enable the cost-effective design of intelligent controllers for three-phase motors by reducing the system components and increasing