TW200614628A - Brushless motor - Google Patents

Abstract

The present invention relates to a brushless motor, including a rotor containing a plurality of magnetic elements disposed along the circumference of a spindle to constitute a wheel-like ring, each magnetic element having two magnetic poles with their respective magnetic pole faces; a stator containing at least an electromagnetic member each having paired poles with their respective pole faces and disposed along circumference of the spindle to constitute a wheel-like ring. The wheel-like ring of the stator is limited between every two magnetic poles of the magnetic elements of the rotor, and at least partial wheel-like ring of the stator is surrounded and contained by the wheel-like ring of the rotor. Two pole faces of the paired poles of the electromagnetic member of the stator define two radial gaps with two different diameters between two magnetic poles of the magnetic element in the wheel-like ring of the rotor, and the one with a larger radius of the two radial gaps formed with two different diameters between the wheel-like ring of the stator and the wheel-like ring of the rotor pertains to an outer gap and the other one with a smaller radius pertains to an inner gap such that two magnetic poles of each magnetic element in the wheel-like ring of the rotor surround and contain the wheel-like ring of the stator with the outer gap and the inner gap therebetween. While considering to employ two ends of an excitation coil of the motor to provide an output torque of the motor, the present invention provides additional structural advantages with which a geometric space balance of the motor can be achieved by virtue of the structure arrangement of each individual part in the motor structure. The motor structure can be further arranged, thereby not only addressing a simple and feasible motor structure but also acquiring a higher efficiency of the motor, outputting smoother torque and providing flexible and safe operating characteristics. The motor structure provided by the present invention can fulfill the aforementioned requirements at least in certain degree.