Continuous Torque Comparison
ETM Direct Drive Motor
Cross-sections of a conventional dc motor and our transverse flux motor.
Conventional Motor
ETM Transverse Flux Motor
ETM direct drive motors are based on patented transverse flux technology to have up to 10 times more electromagnetic poles.
Both motors have electromagnetic “poles” arranged to drive the rotary motion. Direct drive motors have far more poles – up to ten times more on the same size motor – so they produce far more torque, even at low speeds.
Coil Comparison
ETM Coil
Radial Flux Stator
| ETM | Radial Flux | |
|---|---|---|
| R, 1 phase, mΩ | 17 | 100 |
| Coil loss @ 45N-m,W | 150 | 550 |
| Copper, 3p grams | 510 | 900 |
| Continuous Torque, N-m | 35 | 10 |
1/2 HP 10:1 Comparison
AC 1/2 HP 10:1
BLDC Direct Drive
ETM Direct Drive
| AC 1/2 HP 10:1 | BLDC Direct Drive | ETM Direct Drive | |
|---|---|---|---|
| Full Load Torque, ft-lb | 15.1 | 15.0 | 15.4 |
| Full Load RPM | 175 | 200 | 200 |
| Weight, lbs | 50 | 59 | 18.7 |
| Volume, cuin | 506 | 462 | 81 |
ETM Topology
Conventional Radial Flux Machine
ETM Machine
ETM Pole Count does not Affect Coil Resistance
ETM high pole count does not increase resistance.
Pole Count and Coil Resistance
(conventional radial flux machines)
Doubling the pole count more than doubles the resistance for radial flux machines.
