JPS558253A - Motor - Google Patents

Abstract

PURPOSE: To minimize the gap between the stator and the rotor of a motor by coaxially forming a small-diameter cylinder at the closed and of a pair of cylindrical casings opened at one end and constructing both the casings simultaneously upon pressing of the peripheral surfaces thereof to obtain a high concentricity.

CONSTITUTION: Small-diameter cylinders 4, 4 are coaxially formed at both the closed ends 3, 3 of a pair of cylindrical casings 1, 2 opened at one end, and provided with rotary shaft inserting holes 6, 6 thereat. Both the inner peripheral surfaces 7 and 8 of the opening side and samlldiameter cylinder side are simultaneously pressed to form high concentricity therebetween and to also form a step 12 for positioning the stator iron core. Both the casings 1, 2 are disposed oppositely at the opening ends thereof, bearings 9, 9 are press-fitted into the inner surfaces of the cylinders 4,4, respectively. and both the inner surfaces at the opening ends of the casings are forcibly engaged with the ends of the stator iron core 10 to thereby support the rotary shaft 5 of the rotor 11 arranged within the inner periphery of the stator iron core 10 via the bearings 9, 9. Accordingly, it can obtain high concentricity between the stator 10 and the rotor 11 to thereby minimize the gap between the stator and the rotor of the motor.

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