Smart Lock Motor GM2217F
The GM2217F Smart Lock Motor is a compact 4.5 VDC DC gearmotor designed for smart door locks, electronic locks, cabinet locks, and access-control mechanisms that require controlled low-speed torque in a narrow lock-body package. The supplied GM2217FMK1220 reference configuration uses a 1:228 gear ratio, delivering 72 RPM rated speed and 60 mN·m (600 gf·cm) rated torque. Its integrated 11-tooth module 1.0 output pinion supports direct transmission integration in compatible lock mechanisms.
Product Overview
The GM2217F Smart Lock Motor is a compact 4.5 VDC DC gearmotor designed for smart door locks, electronic locks, cabinet locks, and access-control mechanisms that require controlled low-speed torque in a narrow lock-body package. The supplied GM2217FMK1220 reference configuration uses a 1:228 gear ratio, delivering 72 RPM rated speed and 60 mN·m (600 gf·cm) rated torque. Its integrated 11-tooth module 1.0 output pinion supports direct transmission integration in compatible lock mechanisms.
Model Information
| Model | Motor Type | Product Category |
| GM2217F / GM2217FMK1220 | DC Brushed Gearmotor | Smart Lock / Electronic Lock Motor |
Main Parameters
| Rated Voltage | 4.5 VDC |
| Gear Ratio | 1:228 |
| Gearbox Efficiency | 45%–60% |
| Max. Rated Gearbox Torque | 3–5 kgf·cm |
| Max. Gearbox Break Torque | 8–10 kgf·cm |
| Overall Height Shown | 37 mm |
| Housing Width Shown | 16 mm |
| Housing Depth Shown | 26 mm |
Gearmotor Technical Data
| Gearmotor Model | Ratio | Voltage | No-Load Speed | No-Load Current | Rated Speed | Rated Current | Rated Torque | Stall Current | Stall Torque |
| GM2217FMK1220 | 1:228 | 4.5 VDC | 80 RPM | ≤ 100 mA | 72 RPM | ≤ 400 mA | 60 mN·m / 600 gf·cm | ≤ 3000 mA | 0.45 N·m / 4.5 kgf·cm |
Mechanical Interface & Mounting
| Overall height shown | 37 mm |
| Housing width shown | 16 mm |
| Housing depth shown | 26 mm |
| Output pinion outside diameter | Ø13.0 mm |
| Output pinion specification | Module 1.0; 11 teeth; 20° pressure angle |
| Pinion material | Iron-based powder metallurgy |
| Lead / connector shown | PHR-2P; UL1571 / 26AWG |
| Rotation reference | CW |
Dimension Drawing
Engineering Advantages for Smart Lock Projects
Compact smart-lock drive package
The 16 mm-wide housing and 26 mm depth are suited to compact smart-lock and electronic-lock mechanisms where embedded transmission space is limited.
Low-voltage drive matching
The supplied 4.5 VDC, 1:228 reference configuration delivers 72 RPM rated speed and 60 mN·m (600 gf·cm) rated torque. Final selection should be validated at the project’s minimum battery voltage.
Torque margin for lock actuation
The gearbox specification lists 3–5 kgf·cm maximum rated torque capacity and 8–10 kgf·cm maximum break torque, providing a reference for latch-load and jam-margin evaluation.
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.
Integrated output pinion
The supplied drawing specifies a module 1.0, 11-tooth, Ø13 mm pinion that can simplify direct integration with a compatible lock transmission.
Customization-oriented engineering
Voltage, ratio, output pinion/interface, wiring, terminal, noise and lifetime targets can be evaluated around the customer’s actual lock body, load and duty cycle.
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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