Your motor’s performance starts with its core. At Sino, we make high-quality cold rolled motor laminations and transformer laminations. These parts are the foundation of your motor and transformer designs. Our only goal is to give you, our partners, the best materials. Our cold rolled motor laminations will help you build products that are more efficient, more powerful for their size, run cooler, and are much quieter.
Our cold rolled motor laminations are the heart of your motor. They help turn electricity into motion with less energy loss. With Sino, you get a stronger, more reliable product every time. Our special cold rolling process makes the steel for our cold rolled motor laminations very strong and great at being a magnet. This lets you build smaller motors that are just as powerful, or big motors that are stronger than ever.
We make our cold rolled motor laminations to fix the biggest challenges in motor design. We help you stop wasting energy and get the best results.
The biggest enemy of a motor is heat. This heat comes from energy loss. Cutting down on core loss is the most important way to make a motor more efficient. The best way to fight energy loss from eddy currents at high speeds is to use thinner cold rolled motor laminations.
A motor needs a strong magnetic field. A stronger magnetic field lets a motor create more turning force (torque) without getting bigger. This directly improves its power density. Our selection of materials includes special grades of steel. These grades give you the best mix of low energy loss and strong magnetic fields for your cold rolled motor laminations. Also, a core that is glued together is much better at getting rid of heat. It moves heat away to the motor’s outer case and cooling system more easily.
The magnetic core is a main cause of the noise you can hear. We use a few key methods to reduce this noise:
We use modern tools like stamping and laser cutting. This makes sure every cold rolled motor lamination has the perfect shape and size.
Choosing the right material is the first step to a great motor. The quality of the magnetic core decides how well any electric motor or transformer will work. We are experts at carefully controlling the electrical steel. We also create and apply special insulating coatings. Together, the steel and coating work to cut down on energy loss and make the magnetic field as strong as possible.
We offer a wide selection of both Non-Grain-Oriented (NGO) and Grain-Oriented (GO) electrical steels. We know that choosing between these two types of steel is a very important decision. The right choice depends on how the magnetic field will move through the motor.
NGO steels are the main choice for motors and other rotating machines. This is because their magnetic properties are the same in all directions, which gives you consistent performance. We offer many NGO grades with different amounts of silicon, usually from 1.0% to 3.5%. Our special cold rolling and heating processes create the best grain structure for both low-speed (<100 Hz) and high-speed (>400 Hz) uses. We give you detailed data sheets that show the different types of core loss. This helps your engineers choose the right material for their cold rolled motor laminations. We add very small, carefully controlled amounts of other elements like manganese (Mn) and aluminum (Al). We control the steel recipe with extreme precision, down to parts-per-million. This makes sure every batch is exactly the same.
These steels are perfect for transformers. In a transformer, the magnetic field always flows in one direction. GO steels offer the best performance for this. This means they are much easier to magnetize, lose less energy, and can handle a stronger magnetic field in one direction. For our very best GO steel grades, we use special surface treatments like laser scribing. This process improves the steel’s magnetic structure. It greatly lowers energy loss at standard power frequencies (50/60 Hz). This is very important for companies that make high-efficiency transformers and need to meet strict rules.
A cold rolled motor lamination is only as good as its insulation. At Sino, we have created our own set of special coatings. We call them C3, C5, and C6. Each one is made for a different purpose.
Coating Types and Features:
Coating Type | Composition | Main Features | Common Uses |
C3 (Organic) | A thin, organic polymer-based coat. | Good insulation and easy to stamp. Helps protect the stamping tools so they last longer. Cannot be heat-treated above ~400°C. | Common motors, small transformers, ballasts. A good, low-cost choice for making many parts. |
C5 (Inorganic) | A chromate-free, inorganic phosphate-based coat. | Can handle high heat. Good for heat-treating up to ~800°C. Provides excellent insulation. Easy to weld. | High-power industrial motors, EV motors, generators, large transformers. Needed for parts that must be heat-treated after stamping. |
C6 (Organic + Inorganic) | A multi-layer coat with an inorganic base and an organic top layer. | Gives you the best of C3 and C5. The bottom layer handles heat, and the top layer makes it easy to stamp. The top layer can also act as a glue when heated. | Sealed compressor motors, high-efficiency motors. For when you need both top performance and easy manufacturing. Can sometimes replace welding. |
Our coating process is one of our special skills. We use precise roller-coating machines with built-in ovens to dry the coating. This makes sure the coating is perfectly even, usually between 1 and 4 micrometers thick on each side. We constantly check the coating thickness and its ability to insulate without touching it. This makes sure every piece of our coated steel meets your high standards.
A great cold rolled motor lamination isn’t just about the steel. How it’s made is just as important. The way you make and assemble the core has a big effect on its final magnetic and physical properties. We control every step to ensure perfect quality.
This is a very important step. We use heat treatment to make the steel’s magnetic properties perfect. Our heat treatment process, called stress relief annealing (SRA), takes out the stress created during stamping. We do this in a special oven where the atmosphere is controlled to protect the steel from damage.
Finally, we build the core. We have different ways to hold the individual cold rolled motor laminations together.
Sino cold rolled motor laminations are used in almost every industry. They are the key part inside many machines you use every day.
At Sino, quality control is our top priority. We check everything, from the raw steel to the finished part. Our work is certified to ISO 9001. We also follow strict standards like ASTM A717.
We test the magnetic quality and energy loss of our cold rolled motor laminations. We also measure every part to make sure it is exactly the right size and shape. Because we are so focused on quality, the best motor manufacturers trust Sino. We are proud members of groups like the International Electrotechnical Commission (IEC) and the Institute of Electrical and Electronics Engineers (IEEE).
We can provide a complete stator core assembly or a rotor core assembly. Whatever you need, Sino is your partner. We also have experience with roll forming and powder metallurgy. Our cold rolled motor laminations have great physical strength and a smooth surface, which makes them easy for you to use.
Contact Sino today. Let us show you how our cold rolled motor laminations can bring more power and efficiency to your products.
