N20 Worm Self-Locking Gear Motor — 12mm Micro Worm Drive

## Product Title # N20 Worm Self-Locking Gear Motor — 12mm Micro Worm Drive **Self-Locking. Compact. Safety-Critical.** The N20 Worm Self-Locking Gear Motor delivers 0.5–2.0 kg·cm of driving torque with an inherent mechanical self-locking capability — the output shaft cannot be back-driven, even with power removed. Engineered for safety-critical applications: EV charging gun electronic locks, high-security deadbolts, and precision actuators where fail-safe holding is non-negotiable. [CTA: Request Quote →] [CTA: Request Sample →] --- ## Key Specifications | Property | Specification | |:---|:---| | **Motor Diameter** | 12mm | | **Motor Type** | Brushed DC, permanent magnet | | **Gear Type** | Worm gear, metal housing, **self-locking** | | **Self-Locking Force** | Up to 36 kg·cm (back-drive resistant) | | **Reduction Ratios** | 50:1 / 100:1 / 200:1 / 500:1 | | **Rated Torque** | 0.5 – 2.0 kg·cm (ratio-dependent) | | **Rated Speed** | 10 – 200 RPM (ratio-dependent) | | **Noise Level** | <55 dB (@30cm) | | **No-Load Current** | <100 mA (12V) | | **Stall Current** | <500 mA (12V) | | **Voltage Options** | 3V / 6V / 12V DC | | **Output Shaft** | 3mm diameter (standard), customizable | | **Mounting** | M2 screw holes, custom bracket available | | **Materials** | Metal worm + metal gear, brass bushings | | **Connector** | Soldered leads (standard) / JST/Molex (custom) | | **Weight** | ~12g | | **Operating Temperature** | -30°C to +85°C | | **MOQ** | 100 units (samples: 3-5 units) | | **Lead Time** | Samples: 1 week / Production: 2-4 weeks | --- ## Why Self-Locking Matters The worm gear geometry provides a unique mechanical property: the worm (motor side) can drive the gear (output side), but the gear **cannot** back-drive the worm. ``` MOTOR DRIVES OUTPUT EXTERNAL FORCE ON OUTPUT ┌──────┐ ┌──────┐ │ MOTOR│ ⚡ rotation │ MOTOR│ 🔒 LOCKED │ ⚙️ │ ──────→ │ ⚙️ │ ✗──── │ 🪱 │ │ 🪱 │ ← force └──┬───┘ └──┬───┘ │ ✅ MOVES │ ❌ CANNOT MOVE ↓ ↓ [OUTPUT] [OUTPUT] ``` **This means:** Your mechanism stays locked without consuming any power — fail-safe by physics, not by software. | Application | Why Self-Locking Matters | |:---|:---| | 🔌 EV Charging Gun Lock | Connector must stay locked during charging even if vehicle loses power. IEC 62196/GB/T 20234 requirement. | | 🔐 High-Security Deadbolt | Bolt cannot be pushed back from outside — physical anti-tamper security. | | 🏥 Medical Lift/Positioner | Load must hold position safely when power is off. | | ⚙️ Valve Actuator | Valve must maintain position without continuous power draw. | | 🚗 Automotive Actuator | Mechanism must hold position under vibration and shock. | --- ## Performance Data ### Torque & Speed by Reduction Ratio (12V DC) | Ratio | No-Load Speed | Rated Speed | Rated Torque | Self-Locking Force | Typical Application | |:---|:---|:---|:---|:---|:---| | 50:1 | 200 RPM | 150 RPM | 0.5 kg·cm | 6 kg·cm | Fast lock/unlock | | 100:1 | 100 RPM | 75 RPM | 0.8 kg·cm | 12 kg·cm | **EV charging gun standard** | | 200:1 | 50 RPM | 38 RPM | 1.2 kg·cm | 18 kg·cm | **High-security deadbolt** | | 500:1 | 20 RPM | 15 RPM | 2.0 kg·cm | 36 kg·cm | Maximum holding force | > 📊 [Download Full Performance Curves (PDF)] --- ## Motor Options | Option | Voltage | No-Load Speed (before gearbox) | No-Load Current | Best For | |:---|:---|:---|:---|:---| | **6V DC** | 6.0V | 10,000 RPM | <80 mA | Battery-powered locks, portable devices | | **12V DC** | 12.0V | 12,000 RPM | <100 mA | **Standard** — EV chargers, automotive | --- ## Encoder Options For applications requiring closed-loop position control: | Encoder Type | Resolution | Output Signal | Added Length | Best For | |:---|:---|:---|:---|:---| | **Hall Effect** | 7 PPR | 2-channel quadrature | +5mm | Basic position feedback | | **Hall Effect** | 12 PPR | 2-channel quadrature | +5mm | **Standard** — EV charging guns | | **Magnetic** | Up to 512 CPR | A/B/Z index | +8mm | Precision positioning | > With encoder: N20-W01 becomes N20-E01. FOB from $7.50/unit (1K+). --- ## Assembly Options — Motor + Micro Switch For turnkey charging gun actuator integration, we offer pre-assembled motor + micro switch modules: | Assembly | Components | FOB (1K+) | |:---|:---|:---| | **ASM-01 Basic** | N20 Worm Motor + IP67 Micro Switch | $12.00 | | **ASM-01 Encoder** | N20 Worm Motor + IP67 Micro Switch + Hall Encoder | $15.00 | | **ASM-01 Full** | N20 Worm Motor + IP67 Switch + Encoder + Housing + Connector | $18.00 | > 💡 One part number. One supplier. 100% tested. Reduces your assembly complexity and supplier count. --- ## Mechanical Drawing [N20 Worm Self-Locking Gear Motor — Dimensional Drawing with callouts] **Key Dimensions (200:1, 12V):** - Motor body: Ø12mm × 32mm (L) - Gearbox: 12mm × 25mm × 13mm - Output shaft: Ø3mm × 8mm (standard) - Total length: ~48mm - Output axis: 90° to motor axis (worm gear orientation) - Mounting holes: M2, 9mm spacing Downloads: - 📐 [2D Drawing (PDF)] - 🧊 [3D Model (STEP/IGS)] - 📊 [Full Performance Datasheet (PDF)] --- ## Applications | Industry | Application | Why N20 Worm Self-Lock | |:---|:---|:---| | 🔌 EV Charging | AC/DC charging gun electronic locking actuator | Self-locking required by safety standards, compact 12mm profile | | 🔐 Security | High-security electronic deadbolts, safe locks, gun safes | Cannot be back-driven — physical anti-tamper | | 🚗 Automotive | Door lock actuators, fuel flap locks, glove box locks | Automotive temp range, vibration resistant, IATF 16949 available | | 🏥 Medical | Patient lift mechanisms, bed positioners, surgical table locks | Fail-safe holding without power | | 🏭 Industrial | Valve actuators, damper controls, gate mechanisms | Holds position without continuous power draw | | 🤖 Robotics | Robot gripper locks, joint brakes, landing gear locks | Compact fail-safe braking | --- ## Part of These Solutions - [EV Charging Gun Actuator Solution →](ev-charging-gun-actuator-solution) — **Primary motor** for electronic locking actuators - [Smart Lock Micro Motor Solution →](smart-lock-micro-motor-solution) — Anti-tamper deadbolt motor - [Automotive Micro Actuation Solution →](automotive-micro-actuation) — Door and access actuators --- ## Customization Options | Option | Description | MOQ Impact | |:---|:---|:---| | **Output Shaft** | Custom diameter, length, flat, D-cut, keyway, pin hole, cam profile | Standard on all orders | | **Voltage Winding** | Custom winding for 5V, 9V, 24V or specific speed requirements | 1,000 units | | **Gear Ratio** | Custom ratios between standard steps | 2,000 units | | **Encoder** | Hall 7/12 PPR, magnetic up to 512 CPR | 500 units | | **Micro Switch Integration** | IP67 limit switch, custom switching position | 1,000 units | | **Housing** | Custom metal or PBT housing, sealed to IP65/IP67 | 2,000 units | | **Connector** | Sealed automotive connector, custom pin count | 1,000 units | | **Temperature Grade** | -40°C low-temp grease, +105°C high-temp winding | 1,000 units | | **Branding** | Custom label, Yukun or neutral | 5,000 units | --- ## Quality & Testing - ✅ Every motor 100% load-tested before shipment - ✅ Self-locking force verified per batch - ✅ Material traceability (full batch records) - ✅ RoHS & REACH compliant - ✅ ISO 9001:2015 certified factory - ✅ IATF 16949 options for automotive programs - ✅ Temperature chamber validated: -30°C to +85°C - ✅ Salt spray: 48-96h (ISO 9227) - ✅ IP67 validation available for integrated switch assemblies - ✅ 200K+ cycle life testing available --- ## Pricing & Lead Time | Quantity | Unit Price (FOB Shenzhen) | Lead Time | |:---|:---|:---| | Sample (3-5 units) | $9.00/unit | 1 week | | Trial (100-500 units) | $6.00/unit | 2-3 weeks | | Batch (1K-5K units) | **$4.50/unit** | 3-4 weeks | | Volume (10K+ units) | Contact us | 4-6 weeks | > 💡 Prices are FOB Shenzhen. Encoder version (N20-E01) from $7.50. Assembly (ASM-01) from $12.00. Sample fee credited against first production order. --- ## Frequently Asked Questions **Q: Is the self-locking force guaranteed?** A: Yes. Every batch is tested for back-drive resistance at the rated self-locking force. The worm gear geometry inherently provides this property — it is not dependent on electronics or control software. **Q: Can the motor be driven in both directions?** A: Yes. The motor runs in both directions. The self-locking property is on the **output side** — the output cannot be back-driven, but the motor can drive it both clockwise and counterclockwise. **Q: What happens at end-of-travel or stall?** A: We recommend a limit switch (micro switch) or current-sensing cut-off in your control circuit. At stall, the motor draws ~500mA (12V). Our integrated micro switch assemblies provide mechanical end-of-travel detection. **Q: How does this compare to the N20 Metal Spur?** A: Worm gear = self-locking, 90° output axis, higher reduction per stage, slightly lower efficiency. Spur gear = non-locking, parallel output, higher efficiency, lower cost. Choose worm for safety-critical holding; choose spur for cost-optimized continuous motion. **Q: What's the maximum operating temperature?** A: Standard: -30°C to +85°C. High-temperature variants (special grease + winding) available up to +105°C for under-hood automotive applications. **Q: Can the motor be used outdoors in rain/snow?** A: The motor itself is not fully sealed. For outdoor use (charging guns, external locks), we recommend the ASM-01 assembly with IP67-sealed micro switch and sealed housing. The gearbox can be specified with sealed bearings and waterproof grease. **Q: What's the expected cycle life?** A: Standard: 50,000+ cycles under rated load. Extended life version: 200K+ cycles validated (reinforced gear, premium lubrication). Specify your life requirement when requesting a sample. --- [CTA Button: Request Quote for N20 Worm Self-Lock →] [CTA Button: Request Actuator Assembly Sample →] --- > **Yukun** — Your Global Micro Motor Sourcing & Solutions Platform > 📧 [email] | 📱 [WhatsApp] | 🏭 Shenzhen, China > *15+ Years Micro Motor Manufacturing | IATF 16949 | 1-Week Samples | FOB from $4.50*