Rotation speed regulation system for electric tool switch

A rotation speed regulation system for an electric tool switch, comprising a controller, a resistance regulating copper foil electrically connected to the controller, and a resistance regulating reed matched with the resistance regulating copper foil, wherein

• the resistance regulating copper foil comprises a first foil and a second foil, wherein
• the first foil and the second foil are separated from each other;
• the first foil is an intact long strip foil;
• the second foil comprises a plurality of short-circuit gold fingers, a full-resistance foil and a zero-resistance foil;
• wherein
• the plurality of short-circuit gold fingers are arranged at equal intervals in a middle part of the second foil;
• the full-resistance foil and the zero-resistance foil are arranged at both ends of the second foil, respectively;
• the plurality of short-circuit gold fingers in the middle part are arranged in sequence from one end of the full-resistance foil to one end of the zero-resistance foil, and
• the plurality of short-circuit gold fingers, the zero-resistance foil and the full-resistance foil are sequentially connected in series through a resistor;
• the zero-resistance foil is electrically connected to the controller;
• the resistance regulating reed is bridged between the first foil and the second foil;
• a first end of the resistance regulating reed contacting the first foil is a constant contact end, and a second end of the resistance regulating reed contacting the second foil is a resistance regulating contact end;
• a straight contact strip is formed between the resistance regulating contact end and the second foil, and the contact strip is perpendicular to a sliding direction of the resistance regulating contact end on the second foil;
• a width of a short-circuit gold finger of the plurality of short-circuit gold fingers is 0.27 mm, and a distance between two adjacent short-circuit gold fingers is 0.2 mm;
• and
• an inclination angle α is formed between the short-circuit gold finger and the sliding direction of the resistance regulating contact end, α is 107°-110° and a length L of the contact strip is 2.3-2.9 mm.