Views: 11 Author: Site Editor Publish Time: 2023-02-06 Origin: Site
The two main mechanisms that make up the DC motor are the stator and the rotor. The annular iron core, together with the support windings and coils, forms the rotor. The iron core rotates in the magnetic field to generate voltage in the coils, which creates eddy currents. Eddy current is a magnetic loss. When a DC motor loses power due to eddy current flow, it is called eddy current loss. Several factors influence the amount of power loss attributed to eddy flow, including the thickness of the magnetic material, the frequency of the induced electromotive force, and the density of the magnetic flux. The flow of current in the material resistance will affect the way the eddy is formed. For example, as the cross-sectional area of the metal decreases, this results in less eddy current. Therefore, the material must be kept thinner to minimize the cross-sectional area to reduce the amount of eddies and losses.
Reducing the amount of eddies is the main reason for using several thin pieces of iron or iron in an armature core. The thinner pieces are used to produce higher resistance and as a result fewer eddies occur. This ensures that a smaller amount of eddy current loss occurs for each individual piece of iron called a lamella. The motor laminates are made of electrical steel. Silicon steel, also known as electrical steel, is a steel with silicon added to ease the penetration of magnetic fields, increase its resistance, and reduce the hysteresis loss of steel. Silicon steel is used in electrical applications essential to electromagnetic fields, such as motor stators/rotors and transformers.
The silicon in silicon steel helps reduce corrosion, but the main reason for adding silicon is to reduce the steel's hysteresis, which is the time delay between when a magnetic field is first generated or connected to the steel and the magnetic field. The added silicon allows the steel to generate and maintain magnetic fields more efficiently and quickly, which means that the silicon steel increases the efficiency of any device that uses steel as a magnetic core material. Metal stamping is a process of producing motor lamination for different applications. Metal stamping can provide customers with a wide range of customization capabilities. Molds and materials can be designed according to customer specifications.
Motor stamping is a type of metal stamping. Stamping parts were first used in the mass production of bicycles in the 1880s. Stamping replaced the production of parts through die forging and machining, thus significantly reducing the cost of parts. Although the stamping parts are not as strong as the die forging parts, the quality is sufficient for mass production. The import of stamped bicycle parts from Germany to the United States began in 1890. American companies then began to have punch presses custom-made by American machine tool manufacturers, and several automobile manufacturers began using stamped parts before Ford Motor Company.
Metal stamping is a cold forming process that uses a die and a punching machine to cut sheet metal into different shapes. Flat sheets of metal, often called blanks, are fed into a punching machine, which uses a tool or die to transform the metal into a new shape. The material to be stamped is placed between parts of the die, and pressure is applied to shape and shear the material into the final form desired for the product or component.
Each station in the tool performs a different cutting, stamping, or bending as the strip is smoothly unrolled from the coil through a progressive press, and the process of each successive station is added to the work of the previous stations to form a complete part. Investing in permanent steel molds has some upfront costs, but significant savings can be made by improving efficiency and production speed, as well as combining multiple molding operations into a single machine. These steel molds retain their sharp cutting edges and are highly resistant to high impact and abrasive forces.
Stamping, also known as pressing, can be performed in conjunction with other metal forming processes and can consist of one or more of a series of more specific processes or techniques, such as stamping, blanking, embossing, embossing, bending, flanging, and laminating. Using a die to cut metal into different shapes, punching involves removing a piece of scrap when the punch enters the die, leaving a hole in the work piece. Blanking, on the other hand, removes the work piece from the main material, and the metal parts removed are the new work piece or blank.
Embossing A design that creates bumps or dents in sheet metal by pressing the blank against a die containing the desired shape, or by feeding the material blank into a rolling die. Embossing is a bending technique in which a workpiece is placed between a die and a punch or press for stamping, a series of actions that cause the punch tip to Pierce the metal and produce a new shape. Bending is a way of forming a metal into a desired shape, such as an L, U, or V-shaped profile, and bending usually occurs around a single axis. Flanging is the process of introducing a flare or flange into a metal work piece by using a die, press, or specialized flanging machine.
Metal presses can not only punch, they also cast, cut, press and shape sheet metal, and the machines can be programmed or computer numerical control (CNC) to build highly accurate and repeatable shapes, with electric discharge machining (EDM) and computer aided design (CAD) programs ensuring accuracy.