RK-2238 22mm Mini Motor High Torque DC Electric Motor For Curtain Tin Opener

2238 DC Motor Carbon Brush Technical Parameters

• Motor Name/Type:RK-2238-2590 Mini motor
• Rated Voltage: 8.0VDC
• No-load Current: 0.11A max
• No-load Speed: 7171±230 rpm
• At Maximum Efficiency Speed: 6217r/min
• At Maximum Current: 0.717A max
• At Maximum Torque: 6.26mN.m
• At Maximum Output: 4.11
• At Maximum Efficiency:71.7%
• Stall Current: 4.67A
• Stall Torque:480 g.cm
• Body Size: 38.3mm x 22mm (L*D)
• Shaft Size: 2mm diameter
• Weight: 55 grams
• Operating Temperature: -10°C ~ +60°C
• Direction of Rotation:CCW

RK-2238 High Speed High Torque Electric Motor DC Motor Dimension

RK-2238 Micro Motor Dimension Information
1.Motor Shell Size:22mm Diameter*38.3 Length (Length without output shaft length)
2.Front Step Diameter:6mm
3.Front Step Height:1.5mm
4.Output Shaft Length:20mm/6mm/9mm/10mm or Custom
5.Terminal Distance:15.2mm
6.Mounting Screw Holes Distance:14mm
7.Screw Holes Size:2*0.4mm
RK-2238 22mm Mini Motor TN Curve

Explanation For Motor Paramter Information Chart

N:speed
It indicates the number of revolution per minute(rpm) of the rotor,speed would be vary pending on voltage(V) and load point.
I:current
It indicated the amount of electrons (current) discharged when voltage is applied.The load applied to the motor is directly proportional to the current drawn by the motor.
T:torque
The twisting force casusing rotation of the rotor.The value of torque depend on the load and the current drawn by the motor.
P:power output
Power output is the product of N and T.The maximum output (p max) would be at the point of Ts/2 on the P curve.
E:efficiency
The percentage of mechanical power output induced by elctrical input (E=P/VI*100%).The maximum efficienct (E Max) would be found at a point in the torque range less than TS/2.

Why Choose the 2238 Micro Motor as a Bottle Opener Engine?

The 2238 micro motor is an ideal driving core for electric bottle openers due to its compact size, high torque output, and stable performance. Here are its key advantages:

1. Compact Size, Space-Saving

• Diameter: Only 22mm, length: 38mm, perfectly fitting the compact internal structure of bottle openers.

• Lightweight design (~30–50g) enhances handheld comfort.

2. High Torque for Effortless Cap Removal

• Stall torque: 300–500 g.cm, easily handling caps of different materials (metal/plastic).

• When paired with a planetary gearbox, output torque increases 5–10x, ensuring smooth rotation without jamming.

3. Low Power Consumption, Long Battery Life

• Wide operating voltage range (3V–12V), compatible with alkaline or lithium batteries.

• No-load current ≤100mA, load current ≤300mA, ensuring energy efficiency.

4. Quiet & Durable for Better User Experience

• Noise level ≤45dB (at 10cm distance), avoiding operational noise.

• Brush life ≥200 hours (with 5 uses/day, lasting over 5 years).

5. Instant Start/Stop, Responsive Control

• Starting voltage ≤1.5V, response time <0.1s, triggering rotation instantly upon button press.

• Supports forward/reverse rotation, compatible with left/right-threaded caps.

Manufacturing Expertise - Lihua Motor

With over 20 years of DC motor manufacturing experience, Lihua Motor has successfully served 1,000+ global clients across industries. Our 99% on-time delivery rate and ISO 9001-certified production ensure reliable quality control. We specialize in:
✔ Custom motor solutions (voltage, torque, size adjustments)
✔ Prototype-to-mass production support
✔ Strict quality testing (lifespan, noise, torque validation)

Comparison with Other Motor Solutions

Typical Applications

• Household Electric Openers: Cost-effective for daily use.

• Hotel/Restaurant Openers: Custom stainless steel shaft for heavy-duty use.

• Multi-Function Kitchen Tools: Integrates cap removal, peeling, etc.

Selection Tip: For cost efficiency, stability, and plug-and-play use, the 2238 micro motor is the best choice. For ultra-long lifespan, upgrade to a brushless version (30–50% higher cost).

Note: Actual selection should match the gear ratio (20:1–50:1 recommended) to optimize torque/speed balance. Contact Lihua Motor for free technical consultation and custom solutions.

Q & A