Based on the high requirements of the quality of life for people, home appliances and energy saving, environmental protection, noise also gradually become the important influence factors when purchasing electrical people, can develop new type of brushless dc motor, low noise and environmental protection, low energy consumption characteristics make him be the first choice of the electrical appliances product using the motor.
the use of permanent magnet brushless dc motor rotor and the stator of the appropriate location to place the required number of hall switch devices, their output and the corresponding stator winding is connected to the power supply circuit. When the rotor after hall near the switch device, magnetic field of permanent magnet rotor to have electricity hall switch device outputs a voltage power supply circuit conduction of the stator winding, stator winding to the appropriate power supply, and the rotor magnetic field generated the same magnetic polarity, repulsion rotor continues to turn. To the next place, the previous position of hall switch device to stop working, and lower conduction hall switching devices, electricity, make the next winding eppo unmanned aerial vehicle (uav) power system, generate repulsion field makes the rotor continues to turn. So, maintaining the work of the machine.
here, hall switch device ACTS as position sensor, detecting the rotor magnetic pole position, its output to the stator winding on and off power supply circuit, brushless motor, switch role again, leave when the rotor poles, make a hole on the switching devices to stop working, and the next device to work, make the rotor pole is always facing the repulsion magnetic field, hall switch device and the reversing of the stator current role.
in the brushless motor hall switching devices, as well as using the hall element, also can use hall switch circuit. To the use of hall element, usually an external amplifier circuit; Use hall switch circuit, can direct drive motor winding, to make the circuit is simplified, with SS2712 hall switch lock circuit direct drive motor, ferromagnetic materials are motivated by the magnetic field, because of its high magnetic permeability, magnetic resistance is small, the field lines are concentrated inside the material. If the material evenly, the lines of magnetic force distribution is uniform. If defective in materials, such as holes, cracks, etc. , in the defect, the lines of magnetic force will be bent, the distortion that local magnetic field. Using hall sensor detection this kind of distortion, through data processing, can identify the location of the defect, the nature (Holes or cracks)And size (Such as the depth, width, etc. )。
