Smart Lock Motor GM2227FD
The GM2227FD-0001 Smart Lock Motor is a compact 4.5 VDC micro DC gear motor developed for smart door locks, electronic locks, cabinet locks, and access-control mechanisms requiring repeatable low-speed actuation in a space-constrained housing. The supplied technical data identifies a 1:267 reduction ratio with 55 RPM no-load speed, 44 RPM rated speed, 40 mN·m (400 gf·cm) rated torque, and 0.18 N·m (1.8 kgf·cm) stall torque for the GM2227FMN20-09180 gearmotor configuration.
Product Overview
The GM2227FD-0001 Smart Lock Motor is a compact 4.5 VDC micro DC gear motor developed for smart door locks, electronic locks, cabinet locks, and access-control mechanisms requiring repeatable low-speed actuation in a space-constrained housing. The supplied technical data identifies a 1:267 reduction ratio with 55 RPM no-load speed, 44 RPM rated speed, 40 mN·m (400 gf·cm) rated torque, and 0.18 N·m (1.8 kgf·cm) stall torque for the GM2227FMN20-09180 gearmotor configuration. The engineering drawing shows a compact 16 mm-wide housing with an external output gear, CW rotation reference, UL1571 26AWG lead wires, and a GH1.25-2P connector. This configuration is suitable for compact lock-body transmission mechanisms where voltage, output speed, current, torque, noise, and mechanical interface must be matched to the actual latch or bolt load. Final selection should be validated in the customer’s complete lock mechanism under normal, low-voltage, jam, and repeated-cycle conditions.
Model Information
| Model | Motor Type | Product Category |
| GM2227FD-0001 / GM2227FMN20-09180 | DC Brushed Gearmotor | Smart Lock / Electronic Lock Motor |
Main Parameters
| Rated Voltage | 4.5 VDC |
| Gear Ratio | 1:267 |
| Gearbox Efficiency | 45%–60% |
| Max. Rated Gearbox Torque | 2–3 kgf·cm |
| Max. Gear Broken Torque | 5–6 kgf·cm |
| No-Load / Rated Speed | 55 RPM / 44 RPM |
| Rated Torque | 40 mN·m / 400 gf·cm |
| Stall Torque | 0.18 N·m / 1.8 kgf·cm |
Gearmotor Technical Data
| Gearmotor Model | Ratio | Voltage | No-Load Speed | No-Load Current | Rated Speed | Rated Current | Rated Torque | Stall Current | Stall Torque |
| GM2227FMN20-09180 | 1:267 | 4.5 VDC | 55 RPM | ≤80 mA | 44 RPM | ≤180 mA | 40 mN·m / 400 gf·cm | ≤550 mA | 0.18 N·m / 1.8 kgf·cm |
Mechanical Interface & Mounting
| Housing width shown | 16±0.2 mm |
| Overall height shown | 34±0.2 mm |
| Body depth shown | 19.5 mm |
| Output gear | Module 1.0; 13 teeth; 20° pressure angle |
| Output gear tip diameter | Ø15.0 mm |
| Output gear material | Sintered iron alloy (per drawing) |
| Lead wire / connector | UL1571 26AWG / GH1.25-2P |
| Rotation reference | CW |
Dimension Drawing
Engineering Advantages for Smart Lock Projects
Compact smart-lock drive package
The supplied drawing shows a 16±0.2 mm-wide housing with a compact 19.5 mm body-depth reference, supporting tight smart-lock and electronic-lock layouts.
Low-voltage drive matching
The supplied 4.5 VDC reference data specifies 55 RPM no-load speed and 44 RPM rated speed for the 1:267 configuration, supporting controlled low-speed lock actuation.
Rated torque reference
The supplied parameter sheet specifies 40 mN·m / 400 gf·cm rated torque, 0.18 N·m / 1.8 kgf·cm stall torque, and 45%–60% gearbox efficiency for this reference configuration.
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 drawing provides a module 1.0, 13-tooth output gear with Ø15.0 mm tip diameter and 20° pressure angle, together with housing, mounting, lead-wire, and connector dimensions for lock-body integration.
Customization-oriented engineering
Voltage, ratio, output-gear interface, wiring, connector, noise, and lifetime targets can be evaluated around the customer’s actual lock body. Final production specifications should be confirmed against the approved project drawing and sample.
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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Whether you're in the product concept, prototype development, or mass production phase, Shunli Motors can help you find the right micro geared motor drive solution based on your specific application needs.
Submit your product requirements now and get selection advice from our engineers.
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