One of the most, if not the most efficient motor for up to 8 horsepower.

 

Etek DC Motor 12 - 48 volt 8 HP at 48 volts


Etek Permanent Magnet "Pancake" Design , 20% lighter than standard series wound motors.

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. 2-1/4" 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.


FEATURES BENEFITS
50% smaller and 20% lighter (only 22.3 lbs.) than a competitive electric motor - high power to weight ratio.
Lightweight aluminum frame. Less turf compaction.
Provides DC (battery) electric power. Quiet, reliable power source.
Provides a maximum of 20 HP, 8 HP continuous.
“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.

The resulting motor construction is what conventional technologists would describe as a wave wound axial air gap brushed DC motor.Possibly one of the most significant performance features of the Etek motor is efficiency. While demonstrating high efficiencies under no or small loads, conventional DC motors experience a dramatic drop in efficiency (as low as 70 percent are not uncommon) as they are loaded down. This simply means that nearly a third of the valuable energy in the on-board batteries is going toward producing heat and other unwanted power rather than motion. The Etek motor technology does not use battery energy to produce its electric field in the stator. This is done by the neodymium permanent magnets. The use of copper bus bars gives the motor an extremely low internal resistance, which results in greatly reduced losses.”