U8 12V~24V 7Kg Thrust Underwater SUBSEA Thruster/Propeller/propulsion With ESC For ROV and Boat
We are the source factory, for bulk purchase / customization please contact us at llny@underwaterthruster.com.
U8 170KV Support voltage: 12-25.2V (3-6S LiPo)
U8 290KV Support voltage: 12-20V (3-5S Lipo)
Model: U8
Voltage: 12-24V (3-6S LiPo)
Max. current: 28A
Maximum thrust: 7.4Kg
Maximum power: 750W
Size: 128*101mm
Wire length: 900mm
Weight: 450g
Mounting holes: 4*M3
ABOUT PWM
PWM full name is (Pulse-width modulation). It is also called duty cycle signal, which indicates the proportion of the high level duration to the whole signal period. 2ms for the whole period of PWM, 1.5ms stop, 1.5-2ms forward, 1.5-1ms reverse.
From the diagram, we can clearly see that when PWM is 75% (1.5ms), the motor stops rotating, when PWM is 50% (1ms), the motor rotates in reverse, and when PWM is 100% (2ms) the motor rotates in forward.Of course ESC will not only make the motor turn forward and reverse, but can adjust the speed of motor rotation by the duty cycle size of PWM. When the PWM is gradually changed from 75% to 50%, the motor will keep reversing and accelerating from stop until the reverse rotation reaches the maximum. And when PWM is gradually changed from 75% to 100%, the motor is continuously accelerated from stop to forward until the forward rotation reaches the maximum value. That is, PWM is a signal that can be continuously varied, and the effective range is from 50% to 100%.
The frequency of PWM signal is 50hz, 100hz, 200hz or 500hz, etc. The higher the control frequency, the shorter the period, the shorter the control interval, and the faster the ESC and motor response speed The faster the ESC and motor response. Conversely, the lower the control frequency, the longer the period, the longer the control interval, and the slower the ESC and motor response.
Customer Reviews
Hi all! We bought U8 290KV thruster from this manufacturer to assemble our ROV. At the stage of the ROV test in the pool, a drop in thrust from the thruster was noticed. We checked the thruster on the stand and found that the thruster did not meet the declared characteristics. When consuming 22V and 24.5A, the thruster produced only 2.7-3.0 kgf. The original ESC and laboratory unit were used to carry out the tests. That is, after getting into the water after a couple of hours of operation, the thruster stopped producing its characteristics. We opened several thruster and saw defects in the stator casting. Most likely, water has gotten inside and an interturn short circuit occurs, therefore reducing traction and increasing electricity consumption. This is terrible quality. I strongly do not recommend buying this product.
Had not the chance to test them yet but overall quallity looks good. Seems to be a rugged design.
One think that I noticed is that the distance between the prop blades and the housing is quiet big. From what I know about turbine engines and impeller engines is that the efficiency decreases alot if there is a big slot. I assume that a tighter fit would make those thrusters even more powerfull and efficient.