In simple terms: The fixed part of a motor is called the stator, on which are mounted pairs of stationary main magnetic poles with DC excitation; the rotating part (rotor) is called the armature core, on which the armature windings are mounted. When energized, they generate an induced electromotive force, which acts as a rotating magnetic field, producing electromagnetic torque for energy conversion. Based on the shape and mounting method of the stator windings, stator windings can be divided into two categories: centralized and distributed.
Performance characteristics of stator and rotor cores
Stator and rotor cores are commonly used anti-interference components in electronic circuits, effectively suppressing high-frequency noise. They are typically made of ferrite materials. Many people are unfamiliar with stator and rotor cores. To help you better understand our products and broaden your knowledge, we'll introduce the performance characteristics of stator and rotor cores.
1. Low coercivity and high initial permeability: can reduce the operating current of leakage current switch.
2. High saturation magnetic induction intensity: This is beneficial for selecting a higher operating magnetic induction point.
3. High permeability of stator and rotor cores: greatly improves the accuracy of current transformers and reduces ratio error.
4. Lightweight and low cost: The price is significantly better than that of permalloy.
5. It has good overload resistance and good temperature stability: it can work for a long time at 55-130℃.
Factors affecting stator and rotor core layout
Progressive dies for stator and rotor cores, as typical dies characterized by high efficiency, high precision, and long lifespan, are increasingly widely used. Strip layout is crucial to the success of die design, essentially determining the structure of the entire die and directly impacting the production quality of parts. Many factors influence strip layout in actual production; for progressive dies for stator and rotor cores, they are typically summarized as follows:
(1) Product structure. This is the most important factor affecting layout. It generally includes: ① the shape, size and accuracy requirements of the stator, rotor and auxiliary stator; ② whether the stator and rotor are required to be loose pieces or iron cores (divided into stator and rotor that need to be stacked and riveted, one stacked and one loose piece, and both loose pieces), which will affect the design of the forming process and blanking process; ③ whether the rotor needs to be twisted. If it needs to be twisted, the position of the twisting mechanism needs to be considered, and empty stations may need to be added during layout.
(3) Layout type. Layout is usually single-row, double-row, or sometimes triple-row. The material utilization rate is a major criterion for selection.
(5) Mold structure factors. For products requiring twisting and riveting, the space for the twisting mechanism must be considered, often requiring additional empty stations. In progressive dies for motor cores, a pressure plate is generally used to fix the punch on the punch fixing plate. The pressure plate is connected by screws, and sufficient space for the pressure plate must be considered during layout. Whether the core is discharged by belt conveyor or guide cage will affect the mold structure.
(6) Special requirements of customers. These are mainly requirements put forward by customers based on their own production situation. For example, in order to reduce costs, if the silicon steel sheet material used for punching has thickness uniformity error, customers usually require a 180-degree rotation during the stacking and riveting process to ensure the core height tolerance, which will affect the layout.
