Stator core laminations are a vital component of an electric motor, serving an essential purpose in the operation and performance of the machine.
As such, it is important to understand their role and how they interact with other components to ensure an optimal outcome.
In this blog, we will discuss stator core laminations and their function in a motor. We will also highlight some of their benefits, such as reducing eddy currents and losing hysteresis.
What Are Stator Core Laminations?
Stator core laminations are a crucial component in constructing an electric motor. They play a vital role in ensuring optimal performance and efficiency of the motor.
The stator is the stationary part of an electric motor, which contains the coils that generate the electromagnetic field necessary for rotation.
And the stator core laminations form a ring-like structure around these coils to provide support and magnetic insulation.
The laminations are thin steel sheets, typically made from electrical steel or silicon steel, coated with an insulating material.
This coating helps prevent electrical losses caused by eddy currents while reducing noise and vibration throughout the operation.
The sheets are stacked together precisely to create a circular lamination stack surrounding the stator’s winding.
What Is the Primary Function of a Stator Core?
A stator core is a component of an electrical motor that converts electrical energy into mechanical energy. The stator core contains magnets arranged in a pattern to produce magnetic fields. These fields push against the rotating shaft, producing rotational force.
This allows motors to convert electrical power into helpful torque and movement. However, there are several stator cores, each with its primary purpose and function.
Some types are designed for high-speed applications, while others are better suited for low-speed applications. It is essential to consider the application when selecting the correct type of stator core for your motor.
The stator core is typically manufactured using punching/stamping dies or computer-controlled laser cutting machines, with each lamination having a specific profile and exacting tolerances.
Reduces Eddy Current
The stator core laminations in generators, motors, and transformers are crucial in maintaining constant power and preventing power loss.
Stator laminations reduce eddy current flow in the core using lacquer coatings to protect against eddy currents, ensuring thin cores and helping cool the stator core by reducing the risk of overheating and melting.
Eddy currents can result in power loss and are influenced by magnetic material thickness, EMF frequency, and magnetic flux density.
The role of stator core laminations is essential in ensuring optimal performance in electrical machines and preventing potential damage caused by overheating and power loss.
Cools the Stator Core
Stator laminations reduce hysteresis loss, save energy, and decrease the heat from eddy current production. Without laminations, solid metal stator cores can overheat, leading to damage.
They also help manage heat flow in motors and generators, ensuring they operate at optimum temperature.
Reduces hysteresis loss
In addition to generating eddy currents, the electromagnetic field of the stator core also produces a degree of magnetization known as hysteresis.
Hysteresis loss is one of the major factors that impact the efficiency of electrical machines, leading to energy waste and higher electricity bills.
The continuous cycle between magnetization and demagnetization forms a loop – the larger the loop, the higher the cumulative energy consumed to magnetize and demagnetize the stator core.
Fortunately, stator core laminations can help reduce hysteresis loss by minimizing stray magnetic losses within the motor.
Stator core laminations can reduce hysteresis loss in rotating machines by providing a smooth and consistent surface on which to rotate.
What is the material of stator lamination for the motor core?
The material of the stator lamination for the motor core is typically silica-steel. Stator core laminations are thin metal sheets stacked and bonded to reduce eddy current losses.
The stator core in DC motors requires thousands of steel laminations to be stacked in a particular way for optimal eddy current flow.
The laminations are made with very specific dimensions and are manufactured using punching, stamping dies, or laser-cutting machines.
Laser cutting stator laminations for motor core
Laser cutting stator laminations for motor cores is a highly precise and efficient method of manufacturing motor cores. By using laser cutting technology, the process eliminates the need for expensive and time-consuming die-cutting tools.
We will use two methods, laser cut and wire EDM cut, for the prototype production of motor lamination. Laser cutting allows for cutting complex shapes and intricate designs, which would be impossible with traditional cutting methods.
What is the difference between rotor and stator lamination?
Stator lamination and rotor lamination are two key components of an electric motor. The stator is the stationary part of the motor, while the rotor rotates within it.
The main difference between stator and rotor lamination is their design and function.
Stator laminations are typically larger than rotor laminations as they need to accommodate more copper windings.
They also feature a unique shape with teeth-like projections that form winding slots for the copper wire to be inserted into.
On the other hand, rotor laminations tend to be smaller in size with a simple circular or rectangular shape.
Get the Best Stator Laminations from Lammotor
If you are looking for high-quality stamping lamination services, Lammotor can be an excellent choice. We provide turnkey stator core assembly services, including reverse engineering stator cores and creating manufacturing drawings.
We can custom different types of laminations, such as rotor laminations, notching laminations, and segmented stator laminations, exist, with a thickness range of 0.004” to 0.025” and a length of 1” to 10”. Overall, stator core laminations have a crucial role in the production and performance of electric motors. Contact us for motor laminations.