ETEK motor by Briggs & Stratton

This is one of the most powerful DC motors available. There is nothing like it out there. Many of the most powerful spinner robots out there have been using this motor with great success (including Nightmare, Son of Whyachi, Moebius and many more). WARNING: this motor is NOT an ordinary motor, and should be handled with GREAT care. It is very capable of serious power and should always be completely secured before applying any power to it.

24V to 48V (has been run up to 72V)
72rpm per volt (3456rpm @ 48V)
20.8 pounds
7.91" diameter
5.64" length
7/8" shaft with 3/16" keyway and 3/8-16 Tapped center
Torque constant: 1.14 in-lb/Amp (0.13 Nm/Amp)
Max motor current: 330A for 2 minutes
15 horsepower max

Need to proportionally and remotely control this motor? Check out the 48330 Speed Controller!

Brushless ETEK motor by Briggs & Stratton

Get monstrous power from this motor! Brushless Permanent Magnet Syncronous motor otherwise known as PMAC. The phase resistance is very low at 10 milli-ohms, so it is 90% efficient. This motor has a built-in cooling fan set for a CCW direction, but can be run CW with optional fan.

This motor is a direct replacement for the Etek (Briggs & Stratton) brushed DC motor,which means it will work with our Etek Mount. It is an Axial Air Gap permanent magnet motor. This technology is very compact. Highest power to weight ratio of any PM motor technology.

Commutation is accomplished with an internal Hall Cell assembly, connected to the 6-pin external wire harness.

This is a Brushless motor and REQUIRES a 3 Phase, 8 Pole, brushless controller to operate the motor. You CANNOT just hook this up to a battery and have it run as a brushed motor would, it will not function without a proper speed controller.

Specs:
Input voltage: 20-56V DC
Speed: 72rpm/V DC (about 3500rpm at 48V)
Continuous current: 100 Amps
Max Current: 300 Amps (up to 30 sec)
Output: 15hp Max, 6hp continuous
Efficiency: 90%
Output Torque Constant: 1.20 in-lb per Amp
Weight: 22 lbs
Diameter: 8"

OUT OF STOCK, SORRY

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"


etek electric motor50% 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 12 HP, 2.7 HP continuous. High efficiency extends run time.
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.

In this motor the iron laminations are rectangular, which made it possible to have them commercially made from material intended for this purpose without the expense of a special stamping tool. Because the flux passes through the laminations along one axis only, it became possible to take advantage of grain-oriented material normally used in large transformers. This has much better magnetic properties along the grain orientation but worse properties in other directions, so in the traditional type of motor it gives little or no benefit.

This motor went into small-scale production in 1988 with the EV conversion firm London Innovation and later with the Lynch Electric Motor Company (LEMCO). In 1989 four of them powered the boat "An Stradag", driven by the Countess of Arran, to a world record speed for an electric boat of just over 80 km/h (50 mph). The motor was adopted by the Swiss company ASMO for use in its electric go-kart drive systems[3]. Its efficiency extends the life of the batteries and so improves the economics of running an electric kart track.

The patents and license rights for the manufacturing of the Lynch motor are held by the Lynch IP company, which has sold a license to Briggs and Stratton to manufacture the ETEK motor.

LEMCO continued to manufacture motors and now trades under the name of LMC (Lynch Motor Company) which now owns the Lynch IP company and therefore all rights and patents pertaining to the motor.

In 2009, Cedric Lynch has parted company with LMC and is working for Agni Motors, which is producing similar motors.

Lynch motors are mentioned as being a unique product in the documentary "The White Diamond" about a lighter than air ship: "This is actually an interesting motor. It is designed by somebody called Lynch in England. He never went to University and doesn't know any mathematics and stuff like that, but he taught himself electrical engineering. And it turns out the motor he made is one the world's leading in terms of power and mass. And he's developed his own kind of algebra to do that but no other academic can understand what he's doing. But he seems to know more than many academics in electrical engineering departments because this motor is very good performance ... the best that I could find."