1. Brushless DC electric motor J. Belwin Edward Assistant Professor Senior School of Electrical Engineering VIT University Vellore

2. BLDC motors Brushless DC motors (BLDC motors, BL motors) also known as electronically commutated motors (ECMs, EC motors) are synchronous electric motors powered by direct-current (DC) electricity and having electronic commutation systems, The current-to-torque and voltage-to-speed relationships of BLDC motors are linear. BLDC motors may be described as Stepper motors, with fixed permanent magnets and possibly more poles on the stator than the rotor, or Reluctance motors.

3. Advantages over brushed DC motors Electronically commutated. Better speed versus torque characteristics High dynamic response High efficiency Long operating life Noiseless operation Higher speed ranges In addition, the ratio of torque delivered to the size of the motor is higher, making it useful in applications where space and weight are critical factors. PRINCIPLE BLDC motors are a type of synchronous motor. This means the magnetic field generated by the stator and the magnetic field generated by the rotor rotate at the same frequency. BLDC motors do not experience the “slip” that is normally seen in induction motors. BLDC motors come in single-phase, 2-phase and 3-phase configurations. Corresponding to its type, the stator has the same number of windings. Out of these, 3-phase motors are the most popular and widely used.

4. Application Brushless Direct Current (BLDC) motors are one of the motor types rapidly gaining popularity. Appliances, Automotive, Aerospace, Consumer, Medical, Industrial Automation Equipment Instrumentation.

5. Applications Consumer electronics BLDC motors fulfill many functions originally performed by brushed DC motors, but cost and control complexity prevents BLDC motors from replacing brushed motors completely in lowest cost areas. Nevertheless, BLDC motors have come to dominate many applications particularly devices such as computer hard drives CD/DVD players. Small cooling fans in electronic equipment They can be found in cordless power tools Low speed, low power BLDC motors are used in direct-drive turntables for "analog" audio discs. Transport High power BLDC motors are found in electric vehicles and hybrid vehicles. The Segway Scooter and Vectrix Maxi-Scooter use BLDC technology. electric bicycles

6. Applications Contd…… Heating and ventilation HVAC and refrigeration industries Model engineering Aircraft including helicopters. – Their favorable power to weight ratios and large range of available sizes, from under 5 grams to large motors rated at thousands of watts, have revolutionized the market for electric-powered model flight. Their introduction has redefined performance in electric model aircraft and helicopters, Legal restrictions for the use of combustion engine driven model aircraft in some countries have also supported the shift to high- power electric systems. Their popularity has also risen in the Radio Controlled Car, Buggy, and Truck scene,

7. Product Description 1) Rated voltage: DC24, 36V 2) Rated Power: 180--250W 3) Max Efficiency: 80% 4) Wheel size: 12--27.5 inch 5) Rotate speed: 200-500 RPM Advantage 1. Brushless, long life and maintenance-free 2. Small and mini, less weight 3. Excellent start performance and high efficiency 4. More economical 5. Most popular used in Chinese and oversea's electric bike. More Product FeaturesTrademark:Dingus Model NO.: HD-1001 Standard:CE Productivity:1, 000, 000 pcs/year Origin:shanghai Part:Motor Power:200-250w Motor:Brushless Company:Dingus Electronic Technology Co., Ltd.

8. Product Description 1) Rated voltage: DC24, 36V 2) Rated Power: 180--250W 3) Max Efficiency: 80% 4) Wheel size: 12--27.5 inch 5) Rotate speed: 200-500 RPM Advantage 1. Brushless, long life and maintenance-free 2. Small and mini, less weight 3. Excellent start performance and high efficiency 4. More economical 5. Most popular used in Chinese and oversea's electric bike. More Product FeaturesTrademark:Dingus Model NO.: HD-1002 Standard:CE Productivity:1, 000, 000 pcs/year Part:Motor Power:200-250w Motor:Brushless Company:Dingus Electronic Technology Co., Ltd.