3 min read

Permanent Magnet Brushless DC Motor Advantages in Short

The long version runs to eight sections. This is the same comparison against three-phase AC asynchronous traction motors and excited DC motors, stated briefly.

Cutaway of the Caroute brushless motor unit showing the stainless steel shaft, NdFeB stator and three-blade propeller

Efficiency up to 93%

Reactive power consumption is greatly reduced and efficiency reaches 93%.

Smaller and lighter

For the same power, the frame size is smaller than an equivalent Y-series traction motor.

Cutaway of a brushless motor showing the copper stator windings and the direct-drive shaft with no gearbox — Copper stator windings around the direct-drive shaft. No carbon brush anywhere in the path.

Simple and maintenance-free

The structure is simple and the motor is maintenance-free.

Low loss

The machine runs synchronously at any speed, so the rotor carries neither copper loss nor iron loss.

High starting torque, low starting current

Mechanical and control characteristics resemble an excited DC motor: high starting torque at low starting current.

Wide speed adjustment range

Speed can be adjusted across a wide band rather than between fixed steps.

Long-term low-speed running without heating

Suited to frequent starts, stops and commutation — which is what holding station on a fishing mark actually is.

Energy saving

High efficiency and high power factor mean low loss. In passive rotation the brushless DC motor acts as a generator.

What It Means for Your Boat

For a boat drive the two that matter most are the last two: a motor that can sit at low speed all afternoon without heating, and one that wastes little of what the battery gives it.