BL-24C 24mm Slotless Brushless DC Motor — Ultra-Quiet BLDC

## Product Title # BL-24C 24mm Slotless Brushless DC Motor **Silent. Enduring. Precise.** The BL-24C is a slotless brushless DC motor engineered for applications where noise, vibration, and service life are non-negotiable. With zero cogging torque, <30dB operation, and a 15,000+ hour service life, it's the motor of choice for medical ventilators, surgical robots, and premium industrial equipment. No brushes. No maintenance. No compromise. [CTA: Request Quote →] [CTA: Request Sample →] --- ## Key Specifications | Property | Specification | |:---|:---| | **Motor Diameter** | 24mm | | **Motor Length** | 38mm (standard) | | **Motor Type** | Slotless BLDC — zero cogging, sinusoidal BEMF | | **Rated Power** | 5 – 20W | | **Rated Speed** | Up to 15,000 RPM | | **Rated Torque** | Up to 30 mN·m | | **Noise Level** | <30 dB (@30cm) | | **Life Expectancy** | >15,000 hours (bearings-limited) | | **EMI** | Minimal — slotless stator eliminates iron losses | | **Cogging Torque** | Zero — ideal for smooth, low-speed operation | | **Voltage Options** | 12V / 24V DC | | **Winding Options** | Custom kV (RPM/V) for specific speed requirements | | **Hall Sensors** | Integrated 3-phase (standard) / Sensorless (optional) | | **Shaft Diameter** | 3mm (standard), customizable | | **Bearings** | High-precision ball bearings (ABEC-5) | | **Weight** | ~65g | | **Operating Temperature** | -20°C to +80°C | | **MOQ** | 50 units (samples: 3-5 units) | | **Lead Time** | Samples: 1 week / Production: 2-4 weeks | --- ## Why Slotless BLDC? Conventional BLDC motors use a slotted stator — iron teeth around which copper windings are wrapped. This creates **cogging torque**: a jerky, stepped feel as the rotor magnets align with stator teeth. ``` SLOTTED STATOR SLOTLESS STATOR ┌─────────────────────┐ ┌─────────────────────┐ │ ╔═══╗ ╔═══╗ ╔═══╗ │ │ ┌───────────────┐ │ │ ║ █ ║ ║ █ ║ ║ █ ║ │ ← iron teeth │ │ ░░░░░░░░░░░░░░ │ │ │ ╚═══╝ ╚═══╝ ╚═══╝ │ cogging │ │ ░ copper ░░░ │ │ │ ↑ ↑ ↑ │ │ │ ░ coil ░░ │ │ │ cogging at each slot │ │ │ ░░░░░░░░░░░░ │ │ └─────────────────────┘ └─────────────────────┘ ❌ Jerky at low speed ✅ Smooth at any speed ❌ Audible vibration ✅ <30dB ❌ Higher EMI ✅ Minimal EMI ``` | Feature | Slotted BLDC | Slotless BLDC (BL-24C) | |:---|:---|:---| | Cogging Torque | Yes — stepped feel | **Zero** — perfectly smooth | | Low-Speed Performance | Jerky | **Silky smooth** | | Noise | 40-55 dB | **<30 dB** | | EMI | Moderate | **Minimal** | | Efficiency | Slightly higher | **Slightly lower** (5-10% less) | | Cost | Lower | **Higher** | | Best For | High-volume, cost-sensitive | **Medical, precision, quiet** | > 💡 Choose slotless when smoothness, silence, and low EMI matter more than a 5-10% efficiency difference. --- ## Performance Data ### Speed & Torque Characteristics (24V Winding) | Operating Point | Speed | Torque | Current | Efficiency | |:---|:---|:---|:---|:---| | No-Load | 15,000 RPM | 0 mN·m | 0.15A | — | | Rated Load | 12,000 RPM | 15 mN·m | 1.2A | 78% | | Max Efficiency | 10,500 RPM | 22 mN·m | 2.0A | 82% | | Max Power | 7,500 RPM | 30 mN·m | 3.5A | 72% | ### Speed vs Torque Curve ``` Speed (RPM) 15K ┤╲ │ ╲ 12K ┤ ╲___ Rated Operating Point │ ╲___ 10K ┤ ╲___ Max Efficiency │ ╲___ 7K ┤ ╲___ Max Power │ ╲ 5K ┤ ╲ │ ╲ └────────────────────────────────── Torque (mN·m) 0 5 10 15 20 25 30 ``` > 📊 [Download Full Performance Curves and Efficiency Maps (PDF)] --- ## Controller Options The BL-24C requires an external brushless DC motor controller. We offer compatible controllers: | Controller | Type | Voltage | Max Current | Features | Best For | |:---|:---|:---|:---|:---|:---| | **BL-Ctrl-Basic** | Sensor-based (Hall) | 12-24V | 5A | Speed control (PWM/0-5V), direction, brake | Simple speed control | | **BL-Ctrl-Advanced** | Sensor-based + Sensorless fallback | 12-36V | 10A | Closed-loop speed, current limiting, fault protection | Medical & industrial | | **BL-Ctrl-Premium** | FOC (Field-Oriented Control) | 12-48V | 15A | Precision torque/position/speed, CAN bus, RS485 | Surgical robots, servo | | **External Controller** | — | — | — | Use your own controller | Custom integration | [Download Controller Datasheets →] --- ## Mechanical Drawing [BL-24C Slotless BLDC Motor — Dimensional Drawing with callouts] **Key Dimensions:** - Motor body: Ø24mm × 38mm (L) - Shaft: Ø3mm × 12mm (standard) - Mounting: M2.5 threaded holes on front face (4× on Ø18mm PCD) - Hall sensor connector: JST ZH 1.5mm, 5-pin - Phase wires: 3× silicone wire, 200mm length Downloads: - 📐 [2D Drawing (PDF)] - 🧊 [3D Model (STEP/IGS)] - 📊 [Full Performance Datasheet (PDF)] --- ## Applications | Industry | Application | Why BL-24C | |:---|:---|:---| | 🏥 Medical | Ventilators, CPAP devices | <30dB — silent operation in patient environments | | 🏥 Medical | Surgical robot joints | Zero cogging for precise, smooth motion control | | 🏥 Medical | Centrifuge drives | 15,000 RPM capability, 15,000+ hr life | | 🔬 Laboratory | Sample handlers, pipetting robots | Smooth low-speed operation, minimal EMI near sensors | | 🚁 Drones/UAV | Gimbal stabilizers, propulsion | High power density, light weight | | 🤖 Robotics | Collaborative robot joints | Zero cogging for compliant, smooth motion | | 🏭 Industrial | Precision spindles, metering pumps | Long life, stable speed regulation | | 📷 Optics | Lens focus/zoom, filter wheels | Ultra-smooth rotation, precise positioning | --- ## Part of These Solutions - [Medical Device Micro Drive Solution →](medical-device-micro-drive-solution) — Ventilators, surgical robots, centrifuges - [Industrial Automation Micro Drive →](industrial-automation-drive) — Precision spindles, metering pumps - [Robotics Joint Actuator Solution →](robotics-joint-actuator) — Collaborative robot joints, gimbals --- ## Customization Options | Option | Description | MOQ Impact | |:---|:---|:---| | **Winding (kV)** | Custom RPM/V for specific speed/voltage targets | 500 units | | **Shaft** | Custom diameter (2-4mm), length, flat, D-cut, keyway, pinion gear | Standard on all orders | | **Hall Sensor** | Standard 120° spacing, custom spacing, or sensorless | 500 units | | **Connector** | Custom pinout, Molex/JST/TE connector types | 500 units | | **Bearings** | ABEC-7 precision, ceramic hybrid, high-temp grease | 500 units | | **Rotor** | Custom balancing (G2.5/G1.0), custom magnet grade | 1,000 units | | **Temperature** | High-temp winding (Class F/155°C or Class H/180°C) | 500 units | | **Branding** | Custom label, Yukun or neutral | 5,000 units | --- ## Quality & Testing - ✅ Every motor tested: BEMF waveform, hall signals, no-load current, vibration - ✅ Dynamic balancing to ISO 1940 G2.5 (G1.0 available) - ✅ Material traceability (full batch records) - ✅ RoHS & REACH compliant - ✅ ISO 9001:2015 certified factory - ✅ Life test data available (15,000+ hrs validated) - ✅ Temperature chamber tested: -20°C to +80°C --- ## Pricing & Lead Time | Quantity | Unit Price (FOB Shenzhen) | Lead Time | |:---|:---|:---| | Sample (3-5 units) | $30.00/unit | 1 week | | Trial (50-200 units) | $22.00/unit | 2-3 weeks | | Batch (200-1K units) | **$15.00/unit** | 3-4 weeks | | Volume (1K+ units) | Contact us | 4-6 weeks | > 💡 Controller sold separately. Motor + controller bundles available — ask for package pricing. Sample fee credited against first production order. --- ## Frequently Asked Questions **Q: Do I need a controller to run this motor?** A: Yes. All BLDC motors require an external electronic controller to commutate the phases. We offer compatible controllers — or you can use your own. The Hall sensor version works with any standard BLDC controller. **Q: What's the difference between sensor-based and sensorless?** A: Sensor-based (Hall) provides reliable startup and low-speed performance. Sensorless is simpler wiring (3 wires vs 8) but can be jerky at startup. For medical and precision applications, we recommend sensor-based with Hall sensors. **Q: Can this motor run directly on DC power?** A: No — this is a brushless DC motor, not a brushed DC motor. It requires a BLDC controller to drive the 3-phase windings in sequence. The "DC" in BLDC refers to the DC bus voltage, not direct connection. **Q: Is the 15,000 hour life guaranteed?** A: The 15,000 hour rating is bearing life (L10) under rated load and temperature. The motor itself (windings, magnets) has no inherent wear mechanism — unlike brushed motors. Actual life depends on operating conditions. **Q: What makes it "slotless"?** A: The stator has no iron teeth. Copper windings are formed into a self-supporting cylindrical structure and bonded in place. This eliminates all cogging torque and iron losses — the trade-off is slightly lower efficiency and higher manufacturing cost. **Q: Can I use this in a surgical robot?** A: Yes. The zero cogging, <30dB noise, and minimal EMI make it well-suited for surgical applications. We recommend the FOC controller for precision torque/position control. Contact us for medical-grade documentation and biocompatible material options. --- [CTA Button: Request Quote for BL-24C →] [CTA Button: Request Evaluation Sample + Controller →] --- > **Yukun** — Your Global Micro Motor Sourcing & Solutions Platform > 📧 [email] | 📱 [WhatsApp] | 🏭 Shenzhen, China > *20+ Years Manufacturing | ISO 9001 | 1-Week Samples | FOB from $15.00*