ELECTRIC SYNCHRONOUS MOTOR FOR A POWER TOOL

Patentradars sammanfattning

Atlas Copco Industrial Technique AB discloses a slotless permanent magnet synchronous motor featuring three (or multiples of three) concentrically wound, non-overlapping stator coils inside a ferromagnetic tubular yoke. The key innovation is routing each coil's phase cable to one axial end and its Y-point cable to the opposite axial end, splitting cable management across both ends of the stator rather than crowding all connections at one end. This arrangement inherently produces fractional (N+½ turn) windings, which the inventors demonstrate cause no unacceptable torque ripple or vibration when used with slotless, non-overlapping concentrated windings—contrary to prior experience with slotted overlapping designs. The motor targets both sub-50 V battery-powered hand tools and mains-fed tools above 300 V, and is especially suited for tightening applications.

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