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E-Tek
electric motor from Briggs and Stratton ELECTRIC CYCLERY IN LAGUNA BEACH, CALIFORNIA |
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Now back
in stock for a limited time.
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| 12
HP Peak, 2.7 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" 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 Diameter: 7/8"-or 3/4" |
Lightweight aluminum frame. Less turf compaction. Provides DC (battery) electric power. Quiet, reliable power source. Provides
a maximum of 12 HP, 2.7 HP continuous. High
efficiency extends run time. |
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| 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. The performance, however, is far from conventional. When compared to an equivalent wire wound DC motor capable of producing similar torque, several advantages are obvious. The first is that the Etek motor uses one-tenth the steel and one-half the copper as is used in a conventional DC motor. The second advantage is that the Briggs & Stratton motor is one-half the size of a competitive motor. While many designers today think of the motor and controller late in the design cycle, Briggs & Stratton believes that some designers may want to start with the company’s motor size and design around it. 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. Order
online - $680 with $45 US shipping |
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