Yoke iron device for starting electric machine

Abstract

A starter motor for vehicle is provided to reduce the noise due to a stopping operation of an armature assembly by forming a magnet groove on a magnet opposite to a core. A starter motor for vehicle includes an armature assembly(10), a yoke assembly(20), a plurality of planetary gears, an internal gear, an overrunning clutch, a pinion gear, a lever, and a magnetic switch. The armature assembly(10) includes a core(11) having coils(22). The yoke assembly(20) is formed by connecting a plurality of magnets(22) to the outside of the armature assembly(10). The planetary gears are used for receiving the driving force of a driving shaft. The internal gear is installed at the outside of the planetary gears. The overrunning clutch is connected to the internal gear. The pinion gear is connected to the overrunning clutch. The lever is used for shifting the pinion gear. The magnetic switch is used for driving the lever. A magnet groove(90) is formed on an inner circumference of the magnet(22) opposite to an outer circumference of the core(11) in order to enlarge an interval between the inner circumference of the magnet(22) and the outer circumference of the core(11).

Description

technical field [0001] The invention relates to a yoke device for a starter motor. More specifically, it improves the shape of the magnet bonded and fixed on the inner peripheral surface of the yoke, reduces defective products caused by magnet damage during assembly, and reduces the gap between the armature device and the armature device. The rotational noise that occurs is characteristic. Background technique [0002] A typical starter motor is as figure 1 As shown, an armature device 10 with an iron core 11 wound with a coil 13 outside the drive shaft 1, and a yoke device 20 formed by bonding a plurality of magnets 22 to a yoke 21 on one side outside the armature device , a plurality of planetary gears 30 receiving power from the drive shaft 1, an internal gear device 40 composed of internal gears arranged outside the planetary gears, an overrunning clutch 50 connected to the internal gears, and the It is composed of a pinion 60 that is connected with the overrunning clu...

AI Technical Summary

Problems solved by technology

[0006] Secondly, if figure 1 As shown, in the finished starter motor, rotation noise is generated by the armature device 10 rotating inside the yoke device 20

That is, because the shape of the magnet bonded to the inner peripheral surface of the iron core 11 is a flat surface after simply rounding, so when the starter motor is started to rotate the armature device, and then the starting operation is completed and the armature device is stopped, there will be a big problem. loud noise

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