High-Speed Drives for Mass Market Products

The integrated design of a high-speed brushless dc motor with a matched gearbox allows for a given output power to be achieved through the use of a lower torque-rated and thus lower volume, lightweight motor. This paper investigates the optimum speed for a brushless dc machine/gearbox combination and reports on the design, construction and testing of a transmission comprising a 100,000 revs per minute brushless dc motor and a gearbox with an output of 6Nm at 1,577 revs per minute.