Mechanized development of small motor windings
The small motor winding embedding process has long been manually operated, with high labor intensity and low production efficiency, which is inconsistent with other processes of motor production and does not meet the requirements of mass production. Therefore, the mechanization and automation of winding bulk is the main trend in the development of small motor winding manufacturing processes. In recent years, China's small motor winding bulk mechanization and automation has achieved certain results, and automatic embedded equipment has gradually entered some motor manufacturers.
Small motor winding mechanical bulk is divided into direct method and indirect method. Ms. Participate in sharing some contents with you today.
1 direct embedded method
The direct method is also called the straight winding method. It is to directly wire the wire into the core slot, which is mostly used for AC rotor or DC armature winding embedded. The practical application of the rotor or armature winding line machine is generally equipped with automatic metering, automatic job change, automatic clamping of the workpiece and other devices, the structure is more complicated.
2 indirect embedded method
The indirect method is to wind the wire into a coil and then into the core slot, which is mostly used for bulk winding of the stator winding. Commonly used are pull-in methods, and one is electromagnetic shock method.
The pull-in method is often used for single-layer concentric windings, which can be pulled in one step or in several stages, and the tank fullness can reach about 75%. The principle of the operation of the loose wire machine: the guide finger extends into the inner circle of the iron core, and its function is equivalent to extending the iron core notch in the axial direction. The position of each guiding finger is opposite to the tooth, and the guiding index is equal to the number of teeth. The coil is pre-mounted on the guide finger. As the pusher advances, the edge of the coil is pulled into the slot along the retaining groove of the guide finger, and the teeth on the pusher push all the wires remaining in the vicinity of the slot into the slot. The gap between the sides of the guide groove should be equal to the multiple of the wire diameter to prevent the wire from getting stuck when it enters the groove. The slot die is pushed into the slot along the edge of the coil, pressing the wire that has entered the slot. The coil ends slide out of the fingers as the pusher advances to the stroke to keep the ends aligned.
The electromagnetic impact method uses a capacitor to discharge, generates an electric pulse, generates a strong current and an electromagnetic impact force in the coil, pushes the coil into the stator or the rotor slot, and the bell mouth of the coil end is formed by inertia. Since the electromagnetic force is large, the wire is deformed by pressure after being inserted into the groove, and the coil side is tightly compressed in the groove, and the groove full rate can reach 80% or more.
When the electromagnetic impact method is used, the coil to be embedded is first inserted into the groove of the coil thruster, the thruster is arranged in the stator core, the groove is aligned with the stator slot, and a channel is formed to guide the wire into the groove. A non-magnetic short-circuiting device (ie, a short-circuiting ring, made of copper or aluminum) is fixed to the lower end of the propeller. When the capacitor bank is discharged and a pulse current is applied to the coil to be embedded, a magnetic flux is generated in the propeller core, and the short-circuiting device is generated. Inductive eddy currents and flux. The two magnetic fluxes repel each other and generate a repulsive force that pushes the coil into the stator core slot.
Enterprises in the process of mechanical embedding will experience different degrees of running-in process. If the pre-treatment is improper, the failure rate will be higher after being put into use. Compared with pure manual operation, the human factor is excluded, because the equipment cannot be objective. The ground senses the inadequacy of some processes. In particular, mechanized production is more suitable for mass production, and is not applicable when the specifications are stray.
