Smart Lock Motor GM2238F
The GM2238F Smart Lock Motor is a compact 4.5 VDC DC gearmotor intended for smart door locks, electronic locks, cabinet locks, and access-control mechanisms where a small housing and controlled low-speed output are required. The supplied performance sheet specifies 55 RPM no-load speed, 44 RPM rated speed, 40 mN·m (400 gf·cm) rated torque, and 45%–60% gearbox efficiency. Its compact mounting geometry and integrated output interface support embedded lock-body drive systems.
Product Overview
The GM2238F Smart Lock Motor is a compact 4.5 VDC DC gearmotor intended for smart door locks, electronic locks, cabinet locks, and access-control mechanisms where a small housing and controlled low-speed output are required. The supplied performance sheet specifies 55 RPM no-load speed, 44 RPM rated speed, 40 mN·m (400 gf·cm) rated torque, and 45%–60% gearbox efficiency. Its compact mounting geometry and integrated output interface support embedded lock-body drive systems.
Model Information
| Model | Motor Type | Product Category |
| GM2238F / GM2238 | DC Brushed Gearmotor | Smart Lock / Electronic Lock Motor |
Main Parameters
| Rated Voltage | 4.5 VDC |
| Gear Ratio | Not specified in supplied sheet |
| Gearbox Efficiency | 45%–60% |
| Max. Rated Gearbox Torque | Not specified in supplied sheet |
| Max. Gearbox Break Torque | Not specified in supplied sheet |
| Overall Height Shown | 29 mm |
| Housing Width Shown | 20.09 mm |
| Housing Depth Shown | 22 mm |
Gearmotor Technical Data
| Gearmotor Model | Ratio | Voltage | No-Load Speed | No-Load Current | Rated Speed | Rated Current | Rated Torque | Stall Current | Stall Torque |
| GM2238 | 1：267 | 4.5 VDC | 55 RPM | 80 mA | 44 RPM | 1.8 A (as labeled in source) | 40 mN·m / 400 gf·cm | — | — |
Mechanical Interface & Mounting
| Overall height shown | 29 mm |
| Housing width shown | 20.09 mm |
| Body width shown | 15 mm |
| Housing depth shown | 22 mm |
| Output center reference | Ø5.85 mm (+0.05 / 0) |
| Mounting holes shown | 3 × Ø1.6 mm (+0.05 / 0), depth 5.0 mm |
| Lead / connector shown | PHR-2P; UL1571 / 26AWG |
| Rotation reference | CW |
Dimension Drawing
Engineering Advantages for Smart Lock Projects
Compact smart-lock drive package
The approximately 20 mm-wide housing supports smart-lock and electronic-lock mechanisms where space and output-interface packaging are constrained.
Low-voltage operating platform
The supplied sheet specifies 4.5 VDC operation with 55 RPM no-load speed and 44 RPM rated speed.
Rated torque reference
The supplied operating point specifies 40 mN·m (400 gf·cm) rated torque and 45%–60% gearbox efficiency.
Current and stall-protection design
Available no-load, rated, and stall-current data can support power-supply, driver, and protection design. Stall duration should be limited by the control system and validated in the actual lock mechanism; any source field with an unclear unit should be confirmed before final specification release.
Mechanical integration
The supplied drawing defines the compact housing, output-center geometry, mounting holes, PHR-2P connector and 26AWG wiring.
Customization-oriented engineering
Voltage, ratio, output interface, wiring, terminal, noise and lifetime targets can be evaluated around the customer’s actual lock mechanism. Fields not explicitly defined in the supplied sheet should be confirmed during project evaluation.
Main Applications
Smart Door Locks
Drive for latch / bolt transmission mechanisms requiring compact packaging, low-voltage operation and repeatable opening/closing motion.
Electronic Cabinet & Locker Locks
Suitable for compact electromechanical locking mechanisms where installation space and controlled actuation are important.
Hotel / Access-Control Lock Mechanisms
Can be evaluated for lock-body actuation requiring repeated cycles and consistent low-voltage drive performance.
Customized Locking Mechanisms
For non-standard lock bodies, the motor, ratio, pinion/interface, lead wire and terminal can be evaluated against the customer’s mechanism and test standard.
Customization Range
Electrical Configuration
Working voltage / winding configuration, rotation direction, lead wire length and terminal options.
Performance Matching
Gear ratio, target output speed, rated load point, current limit and torque margin based on the real lock mechanism.
Mechanical Interface
Output pinion / shaft interface, mounting features and connection to the customer’s lock-body transmission.
Noise & Reliability
Gear meshing, backlash, lubrication, motor operating point, assembly consistency and complete-lock resonance optimization.
Control / Feedback Integration
Hall sensor, encoder or other feedback functions can be evaluated when required by the project; availability depends on the final structure and specification.
FAQ
Q1. How can noise be reduced in a smart lock gear motor?
Low-noise performance depends on motor speed, gear material and accuracy, gear ratio, backlash, lubrication, assembly consistency, lock-body resonance, and the control profile. For reliable evaluation, noise should be tested in the actual smart lock mechanism, including startup, running, reversing, and end-position impact, rather than relying only on no-load motor noise.
Q2. Can a smart lock motor still provide enough torque when the battery is low?
Yes, but the motor and gearbox must be selected based on the minimum operating voltage of the battery, not only the rated voltage. Low-voltage testing should simulate real conditions such as increased latch friction, door pressure, low temperature, and repeated unlocking to verify starting current, unlocking time, torque margin, and temperature rise.
Q3. How should stall or jam protection be handled in a smart lock motor system?
Stall protection should be handled by the motor, lock mechanism, and control system together. Common methods include current detection, operation timeout, end-position detection, reverse recovery, mechanical limits, and fault alarms. Peak current and stall duration should also be controlled to reduce the risk of motor overheating or mechanical damage.
Q4. How do I place an order with Shunli Motor?
Please send us your application requirements or motor specifications. Our engineering team will develop a suitable solution, confirm the technical details, and provide samples for evaluation. Once the samples are approved, we will arrange mass production. Shipping methods can be selected based on your delivery requirements.
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