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Mothership Marine have been designing and building electric propulsion systems since 2016. On the waterways there are 2 main types of electric motor.
1. AC Induction Motor
2. PMAC Motor (Permanent Magnet AC Motor)
Of the 2 Mothership Marine prefer the PMAC motor. Here's why. Permanent Magnet AC Motors (PMACs) stand out as superior choices for marine propulsion due to their exceptional reliability and efficiency.
The motor consists of two key components: the rotor and the stator. The rotor, connected to the propeller, features permanent magnets typically made of rare-earth metals. These magnets react to the magnetic field generated by the stationary stator, which surrounds the rotor. The stator contains electromagnets powered by an AC current.
The AC current is produced by the motor controller which converts DC current (from the boat’s batteries) to 3 phase AC current and when introduced into the electromagnets causes the rotor to rotate.
PMACs offer several advantages for marine applications:
1. Efficiency: PMACs excel in efficiency as the rotor and stator interact solely through a magnetic field, eliminating friction and reducing wasted energy. The AC signal further enhances efficiency, ensuring smooth transitions between electromagnetic coils for a continuous, efficient rotation.
2. Low Wear and Tear: Labeled as "zero maintenance" motors, PMACs do not require extensive lubrication, ensuring high reliability and longevity. This contrasts with brushed motors that suffer from contact points wearing out over time.
3. Low Noise: PMACs operate quietly by avoiding excess friction and jittery rotor rotation, making them one of the quietest motor types.
4. Power Density: The efficiency of PMAC motors translates into higher power output or a smaller form factor, offering superior power density compared to other motor types.