Why brushless electric boat trolling motor achieves high efficiency and more powerful
Why brushless electric boat trolling motor achieves high efficiency and more powerful thrust from smaller HP?
This topic got much words. I am not disrespect anyone. I am just talk about the brushless electric motor. And the efficiency is just from battery to the propeller power. If you want to consider the electric power generation and battery charging storage, yes the efficiency is not such high. And we are not comparing the electric motor and gas motor's input or output power. We just talk about the smaller HP brushless electric motor's propeller thrust can catch up higher HP gas motor. Brushless electric motor is just a new choice for these boats. For bigger boat, the gas motor is still dominant.
Brushless electric boat motor use permanent magnet brushless DC motor. With the traditional three-phase AC asynchronous traction motors, DC motors and other products, compared traction excitation, permanent magnet brushless DC traction motors advantages:
1, high efficiency. Reactive power consumption is greatly reduced, efficiency up to 93%.
2, small size and light weight. Compared with the same power of Y series traction motors, frame size to be a smaller size.
3, the structure is simple, maintenance-free.
4, the loss is small. Are synchronized operation at any speed, the rotor copper loss neither iron nor consumption.
5, starting torque, low starting current. Mechanical properties and adjust performance and it excited DC motor control is similar, so the starting current, starting torque.
6, wide speed adjustment range.
7. Long-term low-speed operation without heat. Adapt to frequent starts and stops, frequent commutation.
8, energy saving. Due to the brushless DC motor efficiency and high power factor, low loss; brushless DC motor in passive rotation, which is a generator.
According to the permanent magnet brushless DC motor such advantages, we can make high efficiency and more powerful thrust electric motor. Another important part is the brushless electric motor inside power management IC. These motor is infinitely variable speed. When you rotate control switch, it will give the power management IC an electric signal. Then the IC will manage the electric motor to work in a propeller thrust range. To keep the propeller thrust range, you don't need all the time in large RPM and Torque. And there is a propeller thrust curve. The IC will detect the thrust need. The IC will adjust the power input according to the propeller thrust curve need. So the electric motor is working in a curve power input, not all the time in large power input. It can help the saving the energy and protect the electric motor too hot. Current traditional large thrust electric motor cause many repair due to the high tempters. The IC using the new technical with good power management to make sure the brushless motor can work well in unload, loading and overload condition. And the brushless electric is using below RPM 2000’s Low speed brushless motor. So there is no gear box's 3%-5% lost, the power is direct out.
Due to such advantage, the brushless electric motor shaft output power's max efficiency can achieve 80%, the max efficiency in propeller thrust can achieve 65%. Due to the 65% high efficiency, the propeller thrust can achieve as below.
3HP brushless electric boat trolling motor can give max 160LB thrust.
4HP brushless electric boat trolling motor can give max 180LB thrust.
And for such small size electric motor even it's also a generator, we can do energy recovery for current electric boat motor's technical. Otherwise, the efficiency will higher. For larger HP electric motor, you have to consider to using RPM 3000-4000's high speed brushless, the efficiency can’t be so high.
Below two photos are the motor's structure.
