Air cooling direct-drive electric angle grinder

Abstract

The invention discloses an air cooling direct-drive electric angle grinder. The grinder comprises a machine shell and a brushless motor. The machine shell comprises a head with a grinding piece and ahandle part. The brushless motor is arranged on the head, an output shaft of the brushless motor is directly connected with the grinding piece and used for driving the grinding piece to rotate, a cooling fan is arranged at the position, between a grinding wheel disc and a motor shell, on a spindle of the brushless motor, the cooling fan comprises centrifugal blades, a cover plate and an air guidedisc, the cover plate is fixed to the motor shell through a screw, and the air guide disc is arranged on the outer end of the cover plate. Due to the fact that the cooling fan is mounted outside the driving motor, through the air guide disc, cooling air generated by the fan is guided to the outer wall of the motor, the cooling air flows out through grid type air outlets in the outer wall of the motor, the motor is in the closing state during work, an external fan is used for cooling the motor, the cooling during work of the direct drive motor of the angle grinder under the sealing condition isachieved, and the service life of the angle grinder is ensured.

Description

technical field [0001] The invention relates to the technical field of electric tools, in particular to a direct drive angle grinder. Background technique [0002] The electric angle grinder is a grinding tool that uses high-speed rotating sheet grinding wheels, rubber grinding wheels, wire wheels, etc. to grind, cut, derust, and polish metal components. The direct-drive electric angle grinder is an improvement to the conventional angle grinder. Its implementation is based on the use of high-power-density brushless motors instead of series-excited motors to realize the direct drive of the motor shaft. The direct-drive electric angle grinder is usually composed of a motor, a grinding head box, a grinding wheel, a grinding head handle and other components, and the motor spindle drives the grinding wheel mounted on the shaft head to rotate to work. When the angle grinder is working, the self-heating of the motor and the electric control system is driven by the motor shaft to d...

AI Technical Summary

Problems solved by technology

When the angle grinder is working, the self-heating of the motor and the electric control system is driven by the motor shaft to drive the internal centrifugal fan, forming a forced convection circulation air duct between the inside and outside of the angle grinder for heat dissipation. This process is very easy to cut the external metal The dust is sucked into the inner coil area and permanent magnet area of ​​the motor, and the accumulation of dust will cause the blockage of the rotor, which directly threatens the safety of the angle grinder.

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