Spur Gear Motor GM37BM3530
The GM37BM Series is a 37 mm-class DC spur gear motor designed for OEM drive systems that require higher torque, stable low-speed output, and flexible 12 VDC or 24 VDC motor matching. The supplied reference configurations provide rated speeds from 13 to 80 RPM and rated torque from 0.25 to 1.2 N·m. With 2- to 7-stage gearbox options, up to 20 kgf·cm maximum rated gearbox torque, and documented gearbox efficiencies from 35% to 95% depending on stage count, the GM37BM micro gear motor is suitable for industrial automation, smart equipment, commercial devices, compact actuators, and other small electromechanical transmission systems.
Product Overview
The GM37BM Series is a 37 mm-class DC spur gear motor designed for OEM drive systems that require higher torque, stable low-speed output, and flexible 12 VDC or 24 VDC motor matching. The supplied reference configurations provide rated speeds from 13 to 80 RPM and rated torque from 0.25 to 1.2 N·m. With 2- to 7-stage gearbox options, up to 20 kgf·cm maximum rated gearbox torque, and documented gearbox efficiencies from 35% to 95% depending on stage count, the GM37BM micro gear motor is suitable for industrial automation, smart equipment, commercial devices, compact actuators, and other small electromechanical transmission systems.
Model Information
| Reference Model | Motor | Ratio | Rated Voltage | Product Category |
| GM37BM3525-168K | SL-3525 | 1:168* | 12 VDC | DC Spur Gear Motor |
| GM37BM3530-393K | SL-3530 | 1:393* | 24 VDC | DC Spur Gear Motor |
| GM37BM3540-90K | SL-3540 | 1:90* | 12 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 N·m / kgf·cm | Stall Current (mA) | Stall Torque N·m / kgf·cm |
| GM37BM3525-168K | 1:168* | 12 VDC | 23.5 | <100 | 19.5 | <160 | 0.25 / 2.5 | <600 | 1.25 / 12.5 |
| GM37BM3530-393K | 1:393* | 24 VDC | 15 | <100 | 13 | <280 | 1.2 / 12 | <1500 | 4.0 / 40 |
| GM37BM3540-90K | 1:90* | 12 VDC | 100 | <200 | 80 | <1000 | 0.5 / 5.0 | <7500 | 2.5 / 25 |
Gearbox Technical Data
The supplied GM37BM gearbox data covers 2- to 7-stage configurations. Gearbox length ranges from 19 to 31 mm, maximum rated gearbox torque from 5 to 20 kgf·cm, and reference gearbox efficiency from 35% to 95% depending on stage count.
| Item | Reference |
| Gearbox Diameter | Ø37 mm |
| Gearbox Length A | Per drawing |
| PMDC Motor Diameter | Ø35 mm Max |
| Output Shaft | Customizable by project |
| Mounting Interface | Per drawing |
PMDC Motor Technical Data
| PMDC Motor Model | Motor Length B (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-3525 124000 | 25 | 12 VDC | 4000 | <40 | 3300 | <120 | 2.5 / 25 | <550 | 13.5 / 135 |
| SL-3530 246000 | 30 | 24 VDC | 6000 | <45 | 5200 | <250 | 0.7 / 70 | <1450 | 50 / 500 |
| SL-3540 129000 | 40 | 12 VDC | 9000 | <150 | 7950 | <950 | 9.5 / 95 | <7200 | 80 / 800 |
Mechanical & Interface Reference
The supplied GM37BM mechanical drawing shows a Ø37 mm-class gearbox matched to a Ø35 mm-max PMDC motor. The output shaft is Ø6 mm with a D-flat, with a 12 ±0.1 mm shaft projection from the front reference. The front mounting interface uses six M3×0.5 threaded holes on the Ø31 mm mounting circle. Gearbox length is defined by dimension A and motor length by dimension B, which vary with the selected stage count and motor configuration.
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 the appropriate 2- to 7-stage gearbox configuration and evaluate the final ratio against target speed, torque, efficiency, noise, life, and package-length requirements. Gearbox length A must be confirmed from the selected stage count.
Motor Configuration
Motor parameters can be evaluated around the supplied SL-3525, SL-3530, and SL-3540 PMDC motor references. Project-specific voltage, operating point, and matching requirements should be confirmed through engineering evaluation and sample validation.
Output Shaft
Output-shaft and mechanical-interface customization can be evaluated from the customer interface drawing. Provide shaft geometry, length, flat/thread feature, tolerance, radial/axial load, and mating-interface requirements.
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.
FAQ
Q1. What applications are spur gear motors best suited for?
Spur gear motors are well suited for small drive systems with relatively stable loads where efficiency, cost, simple structure, and reliable mass production are important. Typical applications include feeders, small conveyors, opening and closing mechanisms, dispensing systems, smart home devices, medical equipment, industrial automation, and commercial equipment.
Q2. How do I select the right spur gear motor for my application?
Motor selection should be based on the operating voltage, target output speed, continuous torque, starting torque, peak torque, gear ratio, installation space, duty cycle, and operating environment. For applications with jamming, frequent start-stop, or reversing, the actual load profile should also be evaluated rather than selecting the motor based only on no-load speed or equipment weight.
Q3. How can noise and vibration be reduced in a spur gear motor?
Noise and vibration can be reduced by optimizing motor speed, gear accuracy, gear material, backlash, lubrication, assembly tolerances, and mounting structure. Because the final enclosure can amplify resonance, low-noise performance should be validated in the complete customer mechanism rather than relying only on motor no-load noise.
Q4. How should stall, overload, and frequent start-stop conditions be evaluated?
Continuous torque, starting torque, peak torque, stall current, and operating time should be evaluated separately. For applications that may jam or overload, current detection, operation timeout, reverse recovery, or mechanical protection can help reduce the risk of overheating and gear damage. Frequent start-stop and reversing applications should also be validated for gear wear, backlash, temperature rise, and service life.
Q5: 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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