Leaf blower

摘要

A blower assembly for a leaf blower has a case, a motor, an impeller driven by the motor, and an axial fan driven by the motor. The axial fan and the impeller are connected to opposite ends of the motor. The case has an air inlet, an air outlet and an air channel communicating the air inlet with the air outlet. The impeller is disposed inside the air channel to move air through the air channel from the air inlet to the air outlet. The axial fan is arranged to generate an axial flow of air towards the motor to cool the motor.

主权项

1. A blower comprising: a case, a motor and an impeller driven by the motor,
wherein the case comprises an air inlet, an air outlet, and an air channel communicating the air inlet with the air outlet, the impeller being disposed inside the air channel, wherein the motor comprises a stator and a rotor rotatably mounted to the stator, the stator comprising a stator core which comprises a yoke, P primary poles with stator windings wound thereon and P auxiliary poles, the primary poles and auxiliary poles being alternately arranged on the radially inner side of the yoke in a circumferential direction thereof, when the stator windings are electrified, P primary magnetic poles and P auxiliary magnetic poles are formed at the primary poles and auxiliary poles, respectively, the polarity of the primary magnetic poles being opposite to the polarity of the auxiliary magnetic poles, P being an integer greater than one; wherein the rotor comprises a shaft, a rotor core, a rotor winding comprising m winding units where m is an even integer greater than P, and a commutator fixed onto the shaft; wherein the commutator comprises m segments, every two adjacent segments of the m segments being electrically connected together by a winding unit; and at least one of the m winding units comprises P coils connected in series, and opposite ends of each coil are directly connected to corresponding two of the m segments.