12v brushless motor of power tools
Brushless DC motors were developed from conventional brushed DC motors with the availability of solid state power semiconductors - details see: http://www.machineto.com/12v-brushless-motor-of-power-tools-10237730
|Place of Origin:Guangdong China (Mainland)||Brand Name:xinhe motor||Model Number:XH 4660||Usage:Fan,Home Appliance|
|Certification:ROHS||Type:BRUSHLESS DC MOTOR||Torque:<20N.m||Construction:Other|
|Commutation:Brushless||Protect Feature:Other||Speed(RPM):2000~30000rpm||Continuous Current(A):0.2~3A|
|Output Power:30~150W||Voltage(V):12V 24V 48V||Efficiency:IE 2|| |
The commutation function may be performed by various shaft position sensors: optical encoder, magnetic encoder (resolver, synchro, etc), or Hall effect magnetic sensors. Small inexpensive motors use Hall effect sensors. (Figure below) A Hall effect sensor is a semiconductor device where the electron flow is affected by a magnetic field perpendicular to the direction of current flow.. It looks like a four terminal variable resistor network. The voltages at the two outputs are complementary. Application of a magnetic field to the sensor causes a small voltage change at the output. The Hall output may drive a comparator to provide for more stable drive to the power device. Or, it may drive a compound transistor stage if properly biased. More modern Hall effect sensors may contain an integrated amplifier, and digital circuitry. This 3-lead device may directly drive the power transistor feeding a phase winding. The sensor must be mounted close to the permanent magnet rotor to sense its position.
Related Product for 12v brushless motor of power tools