0725 Waterproof Micro Coreless Vibration Motor - 3.7V 16,000 RPM with Internal ERM

Specifications

• Motor Type: Hollow Cup (Coreless) DC Internal ERM Motor

• Operating Voltage: 3.7V DC (Ideal for 1S LiPo)

• No-Load Speed: ~16,000 RPM

• Body Diameter: 7mm

• Body Length: 25.4mm (1 inch)

• Wire Length: Approx. 150mm

• Casing Type: Fully Enclosed / Waterproof

• Wire Colours: Red (Positive), Blue (Negative)

• Rear Seal: White waterproof potting resin

Key Applications and Projects

• Smart Wearable Garments: Sewing the motor into the shoulders of a jacket to provide GPS navigation haptic feedback (e.g., buzzing the left shoulder to turn left) without snagging on the fabric.

• Waterproof Game Controllers: Embedding the motor into the grips of a custom marine or outdoor remote control to provide tactile feedback from a drone or ROV.

• Adult Toys & Novelties: Utilizing the smooth, sealed, and waterproof casing for safe and hygienic vibrating applications.

Unlock New Capabilities (Project Evolution)

• The Haptic Swimming Coach: Swimming requires precise rhythm, but you can't easily hear a metronome underwater. Evolve your training by building a waterproof haptic pacer! Connect an ATtiny85 microcontroller, a small 3.7V LiPo battery, and a transistor to this waterproof 0725 motor. Seal the electronics in a tiny silicone pouch and tuck the motor under your swim cap. Code the Arduino to pulse the motor every 1.5 seconds, providing a physical, waterproof beat to keep your strokes perfectly timed!

Package Includes:

• 1 x 0725 Internal Vibration Waterproof Hollow Cup Motor (with pre-attached wire leads)

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What does "0725" mean? It refers to the physical dimensions of the motor casing: approximately 7mm in diameter and 25.4mm in length.

2. Where is the spinning weight on this motor? The eccentric weight is completely sealed inside the metal cylinder. There are no external moving parts.

3. Is this motor completely waterproof? Yes. The front casing is solid metal, and the rear is potted with waterproof resin. It can withstand rain, sweat, and shallow submersion.

4. What is the operating voltage? The motor is optimized for 3.7V DC, making it a perfect match for standard single-cell (1S) Lithium Polymer (LiPo) batteries.

5. Can I run this on 5V (like USB power)? Running it continuously at 5V will likely over-spin the motor and cause the internal coils to overheat and burn out quickly.

6. Can I run it on a 3V coin cell battery? It will likely vibrate on 3V, but the intensity and RPM will be noticeably lower than at its rated 3.7V.

7. What do the red and blue wires do? Red is Positive (+) and Blue is Negative (-) for the DC power.

8. What happens if I wire it backward? Reversing the polarity just makes the internal eccentric weight spin in the opposite direction. It will vibrate exactly the same.

9. What is a "Hollow Cup" motor? It is another term for a "Coreless" motor. The copper coils form a self-supporting cylinder without a heavy iron core, allowing for incredibly fast start/stop times.

10. How do I mount a completely smooth cylinder? Because there are no moving parts on the outside, you can mount it anywhere! Slide it into a snug silicone tube, wrap it in heat shrink, or use epoxy/superglue to attach it directly to your project chassis.

11. Can I connect this directly to an Arduino output pin? No. A motor draws far more current than a microcontroller logic pin can safely provide. You must use an NPN transistor (like a 2N2222) to act as a switch between the Arduino and the motor.

12. Is the front tip sharp? No, the front of the motor features a smooth, rounded, bullet-like profile.

13. What is the white material on the back of the motor? That is an industrial potting resin. It seals the motor against water and acts as strain relief so the wires don't tear out of the casing.

14. How fast does it spin? At 3.7V, the internal mass spins at approximately 16,000 RPM.

15. Does this motor make a lot of noise? While the motor mechanism is quiet, spinning a weight at 16,000 RPM will cause whatever material it is mounted to to resonate, creating a distinct buzzing sound.

16. Can I control the intensity of the vibration? Yes, by using a PWM (Pulse Width Modulation) signal through your transistor, you can lower the effective voltage to make the motor vibrate softer.

17. Can I use this as a water pump? No. It is completely sealed and designed only to vibrate. It has no impellers or ways to move fluids.

18. Can I cut the wires shorter? Absolutely. The attached wires are quite long to give you flexibility, but you can snip them to whatever length your project requires.

19. How much current does it draw? While it varies by load and exact voltage, micro vibration motors typically draw between 60mA to 100mA at full speed.

20. Is this better than a coin vibration motor? It depends on your application. Coin motors are flatter, but this 0725 cylindrical motor generally has a heavier internal mass, producing a "deeper" and stronger vibration feeling that is excellent for thick clothing or heavy handles.