Mirka Ltd.

Simon Bäck

Stig Finnäs

Tomas Södergård

Tobias Holmqvist

Caj Nordström

Caj NORDSTRÖM

There is provided be a brushless direct current, BLDC, electric motor. The BLDC electric motor comprises a rotor comprising a rotor shaft and a stator arranged around the rotor shaft. The stator comprises a stator hub comprising electromagnets, and cooling channels extending in a direction that is parallel to a longitudinal direction of the rotor shaft and the cooling channels are positioned between the rotor shaft and the electromagnets.

Brushless direct current electric motor and handheld tool

Handheld sander

There is provided a solution for electrical insulation for an output shaft, tool and/or accessory driven by an electric motor, and the presence of the electrical insulation is also easy to verify. A rotor shaft assembly for an electric motor includes at least one section that is configured to extend in an axial direction of the rotor shaft assembly outside of a stator assembly of the electric motor, when the rotor shaft assembly is rotatably mounted inside the stator assembly. An electrical insulator is connected to the at least one section and the electrical insulator is configured to connect to an output shaft for connecting with a tool and/or accessory, or configured to connect directly to a tool and/or accessory to be driven by the electric motor.

Rotor shaft assembly, method for manufacturing of rotor shaft assembly and devices comprising rotor shaft assembly

The presented solution discloses conduit arrangements in an intermediate pad (), a backing pad () and an abrading article (). The conduit arrangements enable controlled conveyance of air onto and extraction of air and debris from the surface of an intermediate pad (), a backing pad () and an abrading article (). The presented solution is an intermediate pad () suitable for use in an abrading system. The presented solution is an abrading system comprising an intermediate pad (). The presented solution is a backing pad () suitable for use in an abrading apparatus (). The presented solution is an abrading system comprising a backing pad (). The presented solution is an abrading article () suitable for use in an abrading system. The presented solution is an abrading system comprising an abrading article (). The presented solution further relates to methods of using an abrading system for extracting abrading debris.

Conduit arrangements in intermediate pad, backing pad, and abrading article for extracting abrading debris

An arrangement for cooling a spindle bearing or bearings of an abrading apparatus with rotating abrading members is disclosed. This is premised on arranging in a housing of the abrading apparatus conduits which extend from a spindle bearing chamber wall of the housing to an inner suction chamber wall of the housing. Via such conduits, hot air may be expelled from a spindle bearing chamber of the housing as an overpressure in front of a protruding balancer element of a rotating shaft balancer is discharged from the spindle bearing chamber via a conduit into a suction chamber. Cool air may be conveyed from a suction chamber into the spindle bearing chamber as an underpressure behind the protruding balancer element draws in air from the suction chamber via the conduit to the spindle bearing chamber.

Growing community of inventors

Vörå, Finland

Simon Bäck