24V~36V Underwater motor waterproof motor thrust 7kg~9kg

Short Description:

Model No SM4025
Motor type Underwater brushless motor
Weight 310g
Underwater thrust 7kg-9kg
Rated torque 0.9 N*m
Rated voltage 24~36V
Minimum order quantity 1unit

Product Detail

Product Tags


SW4025 underwater brushless motor is rated at 24~36 V DC, specially designed for underwater drones/robots. This model has no propeller, users can design their own propeller and fix it with screws.
This is ordinary brushless motor, it can be driven by any ordinary drone ESC controller or ordinary brushless motor controller.
Beautiful shape, long life, low noise technology, high energy saving rate, high torque and high precision.
It is widely used in precision electronic equipment, automation equipment, water and underwater equipment, model aircraft drones and intelligent robots.
Before you place an order, please make sure you have the ability to design the propeller.


Motor type Underwater brushless motor
Weight 310g
Underwater thrust 7KG~9KG
Rated voltage 24~36V
KV value 200~300
Unload speed 7000
Rated power 450~800W
Loaded current 15~23A
Rated torque 0.9 N*m

Design drawing:Screw holes on top used to fix propeller

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About underwater motors

Because brushless motor uses electronic commutation, so let brushless motor operation need to adapt to the motor voltage DC power supply, driver (ESC) and speed control signal.

Take a common model ESC as an example, first disconnect the power supply, connect the motor leads and speed signal line, the throttle travel to the highest (full duty cycle), connected to the power supply, you will hear the "drop" two sounds, the throttle travel quickly to the lowest position, and then you can hear the normal start of the motor "drop ---- drop" sound, the throttle travel calibration is complete, you can start the motor normally. (The operation mode of ESC may be different for different manufacturers, please refer to the manual of the corresponding ESC model or consult the ESC manufacturer for details)

Customers can use regular drone ESC (Electrical speed control) to drive this motor.

We only produce motors, and we do not provide ESC.

SW2216 motor Performance curve (16V, 550KV)

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Underwater motor advantages

1、Waterproof and moisture-proof to avoid short circuit of electrical components inside the chamber.
2、Effective blocking of dust and particles to avoid bearing wear.
3、Keep the cavity dry to avoid the motor and motor being corroded and oxidized, resulting in poor contact or leakage.


Precision Electronic Instrument
Automation Equipment
Underwater Equipment
Aircraft Model Drone
Smart Robot

Output axis

1.Wiring method

First of all, the motor, power supply and ESC should be selected accurately according to the load and use conditions, the power supply voltage is too high is likely to cause damage to the motor and ESC, the power supply discharge power is insufficient to allow the motor to reach the rated power and affect the use of the effect. ESC selection should also be matched with the rated voltage of the motor. Motor installation screws should not be too long, so as not to damage the motor coil. Before wiring, for safety, please remove the motor load, first connect the ESC and motor three leads (three leads can be switched two to change the direction of the motor), and then connect the ESC signal line, pay attention to the signal line wiring order, do not connect the reverse. Finally connect the DC power supply, positive and negative polarity can not be reversed, most of the market ESCs have reverse protection, no reverse protection ESCs in the power supply positive and negative polarity will have the risk of burning.

2.Throttle travel calibration.

When using ESC for the first time, or change the PWM signal source, or use the throttle signal out of calibration for a long time, you need to calibrate the throttle travel.

Lead time and packaging information

Lead time for samples:
Standard motors in stock: within 3 days
Standard motors not in stock: within 15 days
Customized products: About 25~30 days (based on complexity of customization)
Lead time for building a new mold: generally about 45 days
Lead time for mass production: based on order quantity


Samples are packed in foam sponge with a paper box, shipped by express
Mass production, motors are packed in corrugated cartons with transparent film outside. (shipping by air)
If shipped by sea, product will be packed on pallets

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PackagingDelivery method and time

DHL 3-5 working days
UPS 5-7 working days
TNT 5-7 working days
FedEx 7-9 working days
EMS 12-15 working days
China Post Depends on ship to which country
Sea Depends on ship to which country
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payment method

payment method

Master card






Sample order lead-time

about 15 days

Lead time for bulk orders

25-30 days

products quality guarantee

12 months


single carton packing, 500 pieces per box.

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