PMDC Power Tool Motor (D28)
DC motor
PMDC Power Tool Motor (D28) 1. Stator size is optional 2. Safe, reliable, low noise, good starting, long life 3. Strong power
Overview
The D28 Series is a premium, high-performance Permanent Magnet DC (PMDC) motor engineered specifically for demanding cordless and corded power tool applications. Characterized by its robust "D28" frame size, this motor delivers exceptional torque density, rapid response, and durable operation under high-load conditions. It is the core power unit for professional-grade drills, drivers, grinders, saws, and other handheld tools where reliability and power are paramount.
Key Features & Advantages
High Torque & Power Density: Engineered with high-grade ferrite or rare-earth magnets and optimized windings to deliver maximum starting and running torque from a compact frame. Provides the "brute force" needed for drilling into tough materials, driving large fasteners, or continuous grinding/sanding.
Robust Construction for Demanding Duty Cycles: Built with a heavy-duty steel housing, high-capacity ball bearings, and a robust, large-diameter commutator with premium carbon brushes. Designed to withstand the vibrations, impacts, and intermittent overloads typical in power tool use, ensuring long service life.
Excellent Thermal Management: Features an efficient internal cooling fan and optimized airflow design to dissipate heat quickly during continuous high-load operation. High-temperature Class F or H insulation allows the motor to run cooler and sustain performance without thermal derating.
Rapid Dynamic Response: Low rotor inertia and high torque enable very fast acceleration and deceleration, providing immediate trigger response and control for precision tasks like screwdriving or variable-speed cutting.
Optimized for Battery & Variable Speed Control: Ideal for cordless tools, operating efficiently across the voltage range of common battery packs (e.g., 12V, 18V, 20V, 60V). Delivers linear speed-torque characteristics for smooth, controllable speed adjustment via the tool's trigger or electronic switch.
High Efficiency: Minimized magnetic and electrical losses convert more input power (from battery or transformer) into useful mechanical work, extending battery runtime in cordless tools and reducing energy consumption in corded models.
Standardized Mounting & Integration: The D28 frame is a common industry standard, ensuring compatibility with a wide range of gearboxes, chucks, and tool body designs, simplifying assembly and parts replacement.
Typical Specifications
Motor Type: Permanent Magnet DC (PMDC) Motor.
Frame Designation: D28 (Standardized frame for power tools).
Rated Voltage: Commonly 12V, 18V, 20V, 24V, or 36V DC for cordless tools; 110V/220V DC (via rectification) for corded tools.
Output Power: Typically ranges from 150W to 500W+.
No-Load Speed: High, often 15,000 to 30,000 RPM, reduced via integrated planetary gearing to usable tool speeds.
Mounting: Standardized face-mounting flange with through-bolt holes for direct attachment to gear housings.
Shaft: Reinforced output shaft, often with a pinion gear pre-assembled for direct mesh with the first stage of a planetary gearset.
Brush System: Easy-access brush caps for maintenance and replacement, extending the motor's serviceable life.
Primary Applications
Cordless Power Tools: Drills/Drivers, Impact Wrenches, Angle Grinders, Circular Saws, Jigsaws.
Corded Power Tools: Bench Grinders, Polishers, Rotary Tools.
Garden & Outdoor Power Equipment: Cordless Trimmers, Blowers, Chainsaws (small to medium-duty).
Industrial Hand Tools: Nutrunners, Screwdrivers for assembly lines.
Why Choose the D28 Series PMDC Motor?
For power tool manufacturers, motor performance defines the user experience. The D28 Series PMDC Motor is engineered to be the reliable, high-torque heart of professional-grade tools. Its robust design handles the punishment of job site use, while its efficient power delivery ensures users can work longer and tackle tougher tasks. It strikes the perfect balance between raw power, controllable performance, and serviceable durability that professionals demand.
Comparison with Brushless DC (BLDC) Motors:
| Feature | PMDC Motor | BLDC Motor |
|---|---|---|
| Commutation | Brushes & commutator | Electronic (no brushes) |
| Maintenance | Higher (brush wear) | Lower (no brushes) |
| Efficiency | Good (~75-85%) | Excellent (~90-95%) |
| Cost | Lower | Higher (due to controller) |
PMDC motors are a cost-effective, reliable solution for applications requiring simple speed control, high starting torque, and compact size. While brushed designs require maintenance, their simplicity and performance keep them relevant in many industries.
| Model | Voltage | Speed with no load | Current with no load | output power | Torque | ||||
| F28(s)-18165RC | 12V | 11670rmp | 0.12A | 4.4w | 43.9gf.cm |
Typical Market: Products for Industry and commerce uses
DC Motor Techinical Parameters:
| Model | Voltage | No Load | Maximum efficience point | |||||
| Rated Voltage | Speed | Current | Speed | Current | Torque | Output Power | ||
| V | rpm | A | rpm | A | g.cm | N.m | W | |
| HLRT8B7WA-7509 | 18 | 21895 | 4.88 | 18652 | 28.07 | 1965 | 192.65 | 376.5 |
| HLRT8B7WA-A011 | 18 | 19410 | 4.63 | 16362 | 24.83 | 1948.8 | 191.06 | 327.6 |
