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The heart of the E motion Hybrids system is our three-phase, pulse-width-modulated (PWM) permanent-magnet motors.
They were designed specifically for marine use – to provide high-torque, direct drive at low rpm for efficient propulsion of displacement vessels. They need no transmission or reduction gear.
The motors run equally well in forward or reverse, with the same 1,000 rpm maximum speed in either direction. They can be switched from full forward to full reverse in milliseconds without harm to the motor (although for the sake of the coupling to the prop shaft, that's not recommended).
The motors are simple, rugged and made of non-corrosive materials. The rotor is the only moving part. The rotor is ringed by permanent magnets on the outer rim and is fixed solidly to a stainless steel shaft. The shaft spins in tapered roller-thrust bearings at either end. The stator windings, through which the electric current flows, are fixed in the motor's cast aluminum casing.
The only wear points are in the bearings, which are the same type as tractor-trailer wheel bearings. They have an estimated life of 150,000 hours. The bearings are double-sealed on the exterior and single-sealed on the interior to keep water out.
E Motion motors come in three sizes: |
- The 4.5 kW motor is a single unit operated by a single external controller.
- The nine kW motor consists of two 4.5 kW motors fixed to one shaft inside a single casing. Two external controllers operate the two motors within the casing.
- The 18 kW motor consists of two single nine kW motors on one shaft in a single casing with two external controllers. The single nine kw motor is a new design with more compact and efficient winding. It is used only in the 18 kW motor and is not sold separately.
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The motors are all approximately the same diameter but come in different lengths. There are slight variations in width between models at the horizontal ridge on the casing where the mounting brackets are bolted.
The motors are built to our design by the Homewood Group of Pittsburgh, the former manufacturing division of Westinghouse Electric. Homewood is one of the world's most experienced motor builders and service providers. |
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| 4.5 kW |
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| Power output |
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4.5 kW |
| Torque |
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37 lb-ft (50 N-m) |
| Voltage |
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144 vdc |
| Max, current draw |
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32 amps |
| Weight |
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84 lb (38 kg) |
| Width at bracket bolt holes |
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16.5 in (419 mm) |
| Width at motor mount centers |
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20 in (508 mm) |
| Length, casing |
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10 in (254 mm) |
| Length with shaft |
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14 (356 mm) |
| Max. prop diameter* |
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16 in (406 mm) |
| Max. displacement |
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10 t (9.1 mt) |
| Max. monohull length** |
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33 ft (10.1 m) |
| Max. catamaran length** |
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40 ft (12.2 m) |
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| 9 kW |
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| Power output |
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9 kw |
| Torque |
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74 lb-ft (100 N-m) |
| Voltage |
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144 vdc |
| Max, current draw |
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64 amp |
| Weight |
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144 lb (65 kg) |
| Width at bracket bolt holes |
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16.5 in (419 mm) |
| Width at motor mount centers |
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20 in (508 mm) |
| Length, casing |
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14 in (356 mm) |
| Length with shaft |
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18 in (457 mm) |
| Max. prop diameter* |
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18 in (457 mm) |
| Max. displacement |
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16 t (14.5 mt) |
| Max. monohull length** |
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45 ft (13.7 m) |
| Max. catamaran length** |
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52 ft (15.8 m) |
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| 18 kW |
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| Power output |
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18 kw |
| Torque |
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148 lb-ft (200 N-m) |
| Voltage |
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144 vdc |
| Max, current draw |
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128 amps |
| Weight |
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169 lb (76.7 kg) |
| Width at bracket bolt holes |
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15.2 in (382 mm) |
| Width at motor mount centers |
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18.7 in (475 mm) |
| Length, casing |
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17 in (432 mm) |
| Length with shaft |
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21 in (533 mm) |
| Max. prop diameter* |
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25 in (635 mm) |
| Max. displacement |
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28 t (25.4 mt) |
| Max. monohull length** |
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52 ft (15.9 m) |
| Max. catamaran length** |
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66 ft (20.1 m) |
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| *depends on pitch |
**depends on displacement |
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| Motor spec sheet (pdf) |
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