Etek Permanent Magnet "Pancake" Design, 20% lighter than standard series wound motors.
What makes the Etek motor technology unique is the use of copper bus bars rather than steel and copper wire as the basic building block of the armature. These copper bus bars are stamped, bent, coated and assembled into a thin rotary disk. End clips connect the tips of the bus bars to shorten the air gap between the magnets. Steel is inserted between the bus bars to shorten the air gap between the magnets. One of the most unique characteristics of the motor is that simply machining the edges of the copper bars produces the commutator. Since commutator is built in, there is no need for a separate assembly. The motor uses neodymium magnet technology.
20 HP Peak, 8 HP continuous Voltage........................50 VDC Max Nonload Current.....6 AMP Max Nonload Speed........3600 RPM MIN Nonload Speed.........3300 RPM Min Speed at 160 Lbln.....3200 RPM Max Current at 160 Lbln...150 AMPS Shaft Size .......................7/8" Dia. 1 3/4" long Voltage Constant: 72 RPM per volt Torque Constant: 1.14 in lbs/Amp Continuous Current: 300 A 30 Sec. Weight: 20.8 lbs Motor Diameter: 7.91" Motor Length: 5.64" Shaft Keyway: 3/16" and runs the full length of the shaft The Shaft has a threaded tap on the end.
Available from "Cloud Electric Vehicles" www.cloudelectric.com
See article here.