Abdul

BRUSHLESS DC MOTOR (BLDC) WITH WIRELESS CONTROL: A brushless DC (BLDC) motor is a rotating electric machine where the stator is a classic three-phase stator like that of an induction motor and the rotor has surface-mounted permanent magnets. In this respect, the BLDC motor is equivalent to a reversed DC commutator motor, in which the magnet rotates while the conductors remain stationary. In the DC commutator motor, the current polarity is altered by the commutator and brushes. On the contrary, in the brushless DC motor, the polarity reversal is performed by power transistors switching in synchronization with the rotor position. Therefore, BLDC motors often incorporate either internal or external position sensors to sense the actual rotor position or the position can be detected without sensors. The BLDC motor is driven by rectangular voltage strokes coupled with the given rotor position. The generated stator flux interacts with the rotor flux, which is generated by a rotor magnet, defines the torque and thus speed of the motor. The voltage strokes must be properly applied to the two phases of the three-phase winding system so that the angle between the stator flux and the rotor flux is kept close to 90° to get the maximum generated torque. Due to this fact, the motor requires electronic control for proper operation.

Key Characteristics: * Really a multi-phase AC motor, but can control it like a DC motor using trick * Like a DC motor turned inside out, commutation done on windings * Medium construction complexity, multiple fields, delicate magnets * High reliability (no brush wear), even at very high achievable speeds * High efficiency * Low EMI * Driven by multi-phase Inverter controllers * Sensorless speed control possible * Higher total system cost than for DC motors

Application Parameters Industrial Voltage 100 - 240 Vac

Motor Power 50 -2,200 W

Speed Range 0 - 20,000 RPM

Motor Power several watts to 1kW

Speed Range 0 - 15,000 RPM

Automotive Voltage 12/42V

Applications * PC fans * Ceiling fans * Blowers * Washing machines * Electrical Power Steering * Industrial drive

* Servo drives * Electric vehicle traction drive * Automotive applications * Refrigerator * AirConditioning * Fan