Brushless motor for power tool

A power tool comprising:

• a tool bit,
• a DC brushless motor including a stator and a rotor, the brushless motor being adapted to drive the tool bit via the rotor that is rotated by supplying driving current to the stator,
• a cooling fan that rotates to cool the brushless motor, wherein the cooling fan is molded of a magnetic material or a conductive material and
• a position detector that detects rotating position of the rotor with respect to the stator, wherein the position detector is defined by the cooling fan and a hall element disposed closed to the cooling circuit.

A brushless motor for a power tool comprising:

• a stator,
• a rotor and
• a cooling fan to be rotated,
• wherein the brushless motor is disposed within the power tool and adapted to supply driving current to the stator to drive a tool bit of the power tool by rotating the rotor, the cooling fan is molded of a magnetic material so that the cooling fan also serves as means for detecting a rotating position of the rotor with respect to the stator.

A brushless motor for a power tool comprising:

• a stator,
• a rotor,
• a drive shaft integrated with the rotor so as to rotate together with the rotor and
• a cooling fan coupled to the drive shaft, wherein the cooling fan rotates coaxially with the drive shaft, the cooling fan having a plurality of fan blades extending from the side of the cooling fan opposite to the rotor,
• wherein the brushless motor is disposed within the power tool and adapted to supply driving current to the stator to drive a tool bit of the power tool by rotating the rotor, the cooling fan is injection molded of a resin mixed with a magnetic material or a conductive material so that the cooling fan also serves as a rotating position detector that detects the rotating position of the rotor with respect to the stator.

A power tool, comprising:

• a tool bit,
• a DC brushless motor including a stator, a rotor and a drive shaft integrated with the rotor so as to rotate together with the rotor, the brushless motor being adapted to drive the tool bit via the rotor that is rotated by supplying driving current to the stator,
• a cooling fan that rotates to cool the brushless motor, wherein the cooling fan is injection molded of a resin mixed with a magnetic material or a conductive material, the cooling fan is coupled to the drive shaft and rotates coaxially with the drive shaft, the cooling fan includes a plurality of fan blades extending from the side of the cooling fan opposite to the rotor
• a position detector that detects rotating position of the rotor with respect to the stator, wherein the position detector is defined by the cooling fan and a hall element disposed closed to the cooling circuit.