Spur Gear Motor GM824FMN20
The GM824FMN20 Series is a compact 4.5 VDC DC spur gear motor designed for small mechanisms that require low-speed output, controlled current, and a mature spur-gear transmission in a space-constrained package. The supplied GM824FMN20 reference configuration uses a 1:240 gear ratio, delivering 58 RPM at no load and 50 RPM at the rated operating point. Reference rated torque is 24 mN·m (240 gf·cm), with a stall torque of 0.13 N·m (1.3 kgf·cm).
Product Overview
The GM824FMN20 Series is a compact 4.5 VDC DC spur gear motor designed for small mechanisms that require low-speed output, controlled current, and a mature spur-gear transmission in a space-constrained package. The supplied GM824FMN20 reference configuration uses a 1:240 gear ratio, delivering 58 RPM at no load and 50 RPM at the rated operating point. Reference rated torque is 24 mN·m (240 gf·cm), with a stall torque of 0.13 N·m (1.3 kgf·cm). Its N20 brushed DC motor, compact gearbox layout, and external gear-drive architecture make it suitable for locking mechanisms, smart-home actuators, compact automation modules, dispensing equipment, and other OEM micro-drive applications.
For engineering selection, confirm the required output speed, continuous/start/peak torque, duty cycle, allowable current, installation space, noise target, jam/stall conditions, and customer-side gear or mechanism interface. Final current, temperature rise, noise, gear loading, and service life should be validated in the complete customer mechanism rather than from no-load data alone.
Model Information
| Reference Model | Motor | Ratio | Rated Voltage | Product Category |
| GM824FMN20 | SL-N20-09175 | 1:240 | 4.5 VDC | DC Spur Gear Motor |
Reference Gearmotor Performance
| Gearmotor Model | Ratio | Rated Voltage (V) | No-Load Speed (RPM) | No-Load Current (mA) | Rated Speed (RPM) | Rated Current (mA) | Rated Torque mN.m / gf.cm | Stall Current (mA) | Stall Torque mN.m / gf.cm |
| GM824FMN20 | 1:240 | 4.5 VDC | 58 | ≤65 | 50 | ≤130 | 24 / 240 | ≤680 | 130 / 1300 |
Gearbox Technical Data
| Item | Reference Data |
| Reference Gear Ratio | 1:240 |
| Max. Rated Gearbox Torque | 0.5-1.5 kgf·cm |
| Max. Gearbox Break Torque | 2-3 kgf·cm |
| Gearbox Efficiency | 25%-45% |
| Selection Note | Confirm output speed, continuous/start/peak torque, current, duty cycle, and jam conditions for the final configuration. |
PMDC Motor Technical Data
| PMDC Motor Model | Motor Length L (mm) | Rated Voltage (V) | No-Load Speed (RPM) | No-Load Current (mA) | Rated Speed (RPM) | Rated Current (mA) | Rated Torque mN.m / gf.cm | Stall Current (mA) | Stall Torque mN.m / gf.cm |
| SL-N20-09175 | — | 4.5 VDC | 14000 | ≤40 | 12000 | ≤130 | 0.25 / 2.5 | ≤680 | 1.5 / 15 |
Mechanical & Interface Reference
Engineering Value for Product Development
Compact GM824FMN20 spur-gear platform for small OEM mechanisms
The GM824FMN20 combines an N20 brushed DC motor with a compact spur gearbox, making it suitable for mechanisms that prioritize mature transmission architecture, low-speed output, controlled current, and repeatable mass production.
1:240 ratio for low-speed output and torque multiplication
The supplied reference configuration uses a 1:240 reduction ratio. Ratio selection directly affects output speed, available torque, gearbox efficiency, current consumption, cycle time, and acoustic performance, so the final configuration should be matched to the actual load profile.
Gearbox torque capability must be checked separately from motor stall torque
The gearbox reference data specifies 0.5-1.5 kgf·cm maximum rated torque and 2-3 kgf·cm maximum break torque. The selected operating point should remain within gearbox capability under continuous, start-up, peak-load, and jam conditions.
Efficiency must be considered in current and thermal validation
Reference gearbox efficiency is listed as 25%-45%. Final output capability, current, temperature rise, noise, and service life should therefore be validated at the selected load and in the complete customer mechanism.
Jam and stall protection should be designed at system level
For locking, feeding, opening/closing, dispensing, or other mechanisms with possible jamming, normal operating torque and jam peak torque should be evaluated separately. Current detection, action timeout, reverse-release logic, or mechanical protection should be considered at system level.
Main Applications
Smart Agriculture & Gardening
Electric pruning tools, automatic feeding equipment, small irrigation devices, spraying equipment, quantitative feeding, rotary adjustment and automatic opening/closing mechanisms.
Focus: Evaluate dust/moisture exposure, startup resistance, jam conditions, gear material, lubrication and product-level sealing in the real equipment.
Automotive Electronics
Automotive door locks, charging-port covers, HVAC air flaps, hidden door handles and other small opening/closing mechanisms.
Focus: Validate high/low-temperature start, vibration, stall, noise, duty cycle and batch consistency according to the customer project standard.
Smart Home
Smart door locks, electric curtains, window openers, smart blinds, automatic soap dispensers, smart bins and compact appliance actuators.
Focus: Balance noise, power consumption, startup current, speed, torque, package size and repeated-cycle reliability.
Medical Equipment
Electronic blood pressure monitors, drug-dispensing equipment, sample transport mechanisms, medical valves and compact rotate/push-pull/open-close/quantitative actuators.
Focus: Evaluate noise, vibration, temperature rise, duty cycle, stall protection and batch consistency inside the actual device.
AI Robots
Service-robot grippers, hatches, feeding mechanisms, cleaning modules and light-load joints.
Focus: For frequent start-stop or reversing, verify gear impact, wear, backlash, lubrication, output-shaft loading and cycle life.
Industrial Automation
Small conveyors, feeders, sorting mechanisms, labeling equipment, automatic fixtures and inspection equipment.
Focus: Separate continuous, starting and peak torque requirements; match motor, ratio and stage count to the actual cycle rather than applying one generic safety factor.
Commercial / Office Equipment
Coffee machines, printers, copiers, smart lockers and ticketing equipment for feeding, dispensing, opening/closing, locking and transmission.
Focus: Evaluate jam/stall peak torque, noise, cycle life and recovery logic while controlling package size and cost.
Custom Drive Applications
Non-standard small transmission mechanisms where standard voltage, speed, ratio, shaft, mounting or motor configuration does not fit.
Focus: Re-match motor, ratio, stage count, output shaft and operating point to the customer mechanism and validation target.
Customization Range
Gear Ratio & Stage Count
Select from the supplied 1:240 reference ratio and any project-specific ratio options confirmed by engineering and evaluate each configuration against target speed, torque, gearbox length, efficiency, noise, and life requirements.
Motor Configuration
Motor parameters can be customized. The supplied platform includes SL-N20 PMDC motor references at 4.5 VDC; project-specific voltage and operating point should be confirmed through engineering evaluation.
Output Shaft
The project-specific output interface can be evaluated from drawings or samples. Provide shaft geometry, length, flat/thread feature, tolerance and interface drawing for evaluation.
Performance Matching
Output speed, torque and current should be matched to the actual continuous/start/peak load and duty cycle. A target RPM alone is insufficient for reliable selection.
Gear / Lubrication Optimization
For noise, life, start-stop or environmental requirements, gear material, meshing condition and lubrication can be evaluated as part of the project solution.
Wiring / Interface
Lead wire and terminal/interface requirements can be evaluated from drawings, samples and assembly constraints.
Validation & Mass Production
Sample-stage validation can cover speed, current, torque, noise, temperature rise, stall/jam behavior, cycle life and installation fit; pilot production should confirm process capability and batch consistency.
Information Required for Custom Evaluation
End product and motion task
Working voltage
Target output speed
Continuous, starting and peak torque requirements
Installation space and output-shaft/interface drawing
Single-cycle run time and daily operating cycles
Start-stop / reversing frequency
Expected jam or stall conditions
Ambient temperature, noise target and expected service life
Annual demand and validation/certification requirements
FAQ
Q1. What information is required to select a GM824FMN20 spur gear motor?
Provide working voltage, target output speed, continuous/start/peak torque, installation space, shaft/interface drawing, run time per cycle, daily cycle count, stall/jam conditions, noise target, life target and annual demand. If parameters are incomplete, a mechanism drawing or existing motor sample can be used for initial matching.
Q2. How should engineers select the gear ratio and operating point?
Start from the target output speed and torque, then check gearbox rated torque, break torque, efficiency, motor current, duty cycle and available installation space. The selected operating point should meet the mechanism requirement without relying on prolonged stall or excessive torque margin.
Q3. Can the GM824FMN20 be used when the mechanism may jam?
It can be evaluated, but normal operating torque and jam/stall peak torque must be treated separately. The gearbox breaked torque must not be ignored, and the complete system should use appropriate current, timeout, reverse-release or mechanical protection when blockage is possible.
Q4. How can noise be reduced?
Noise should be optimized at system level through motor operating speed, ratio and stage selection, gear meshing, lubrication, assembly consistency, mounting stiffness and enclosure resonance. Final acceptance should be performed in the customer's actual product rather than by motor no-load noise alone.
Q5. What can be customized for a GM824FMN20 project?
The source data explicitly supports gearbox transmission-ratio and output-shaft customization, as well as motor-parameter customization. Other project-specific items such as wiring/interface, gear/lubrication and performance matching should be confirmed through engineering evaluation.
Q6. What should purchasing teams provide for quotation and mass-production evaluation?
Provide the target model or performance requirement, drawing/sample, estimated annual demand, expected validation items and critical quality/delivery requirements. For customized projects, the sample scope and volume-production acceptance criteria should be confirmed after the technical solution is frozen.
Parameter Integrity Note
All numerical gearbox, gearmotor and PMDC motor parameters in this document are reproduced from the supplied GM824FMN20 parameter workbook and GM824F mechanical drawing. The engineering drawing is treated as the primary source for dimensions and interfaces. Final production specifications should be confirmed against the approved project drawing and sample before mass production.
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