Why are some motor rotors is magnets? Some are not?

Addtime:2024-05-13 15:35:08 Click:358

Many people have such questions, why some motor rotors are magnets? Some are not? why is that? Today, the manufacturer of courage magnets will give you the answer.

Anything that uses permanent magnets as a stator or rotor is a DC motor. The coil current of the DC motor must be commutated through the commutator to achieve continuous rotation. Brush commutation is widely used due to its simple structure and low technical requirements. It was not until later that brushless DC motors using electronic commutation appeared. Ordinary DC motors can only make magnets into stators to rotate the coils because the coil current needs to be commutated. The brushless DC motor has no mechanical commutator, the coil is made into the stator, and the magnet is made into the rotor. There are exceptions to everything. There is no magnet in the AC motor, and the current in the coil is also naturally commutated, so the coil can be made into both a stator and a rotor. The rotor can be an inner rotor or an outer rotor.

Motor arc segmented ferrite magnets

Motor arc segmented ferrite magnets

The coil is used as the rotor of the asynchronous motor. The rotating magnetic field generated by the stator winding rotates faster than the rotor speed. The rotating magnetic field and the rotor coil have a speed difference. The rotating magnetic field cuts the coil to generate an induced current, so that the rotor coil generates an induced magnetic field.

Generally speaking, brushed motors use coils as rotors, and brushless motors use magnetic steel as rotors.

Common magnet categories for motor rotors;

Neodymium Arc Segment Magnets

Bonded Neodymium Magnets

Motor magnet related problems;

Requirements of brushless motor for magnet

Temperature resistance and surface treatment of brushless DC motor magnets

Glue for electric motor magnets


Anisotropic disc ferrite magnets with dia 9mm thick 3mm

This product is round ferrite magnet with a diameter of 9mm and a thickness of 3mm, the performance class is Y30, magnetized in the thickness direction, without electroplating protective layer, the magnetic force is usually 700-1000gs, the working temperature is -40°C to +250°C, Suitable for sensors, suction parts, electrical appliances, Hall induction....

Rectangular Ferrite Magnet with Concave Dots 46x21x10mm

The sample shows a length of 46mm, width 21mm, thickness 10mm rectangular (bar) ferrite magnet, each anisotropic Y30 grade, there is a small pit on the surface of the magnet, in the fixed installation of the inside of the glue can be added,...

Neodymium magnet block with two screw holes 20 x 10 x 5mm

This sample is a rectangular block magnet with 2 holes (screw holes), which is provided by the Karich magnet manufacturer in China. The material is rare earth NdFeB, the size is 20mm in length, 10mm in width, 5mm in thickness, and the surface of the magnet is nickel-plated. Thickness direction magnetization, suitable for industry, home, DIY, assembly, etc. Welcome to inquiry....

Coated gold oval runway shaped neodymium magnet 25 x 5 x 2.5 mm

Magnet name: Rectangular rounded magnet, Oval Power Magnets Manufacturer: Courage Magnets in China,Size: Length 25mm, Width 5mm, Thickness 2.5mm,If you have a similar runway magnet, runway ring magnet, please contact our company to quote for you....

Special Customized Rectangular Block Magnets with Oval Holes

This is a customized rectangle magnet with hole, its hole is not round, but oval, the position of the hole is not in the middle, left or right, is processed according to the customer's special needs, the magnetic properties of the N52 grade, with a high magnetic field strength,...

Diameter 30mm ferrite magnet disc 30mm x 3mm Y30

This product is a round magnet with a diameter of 30mm, Supplied by Courage Magnet Manufacturers in China, which is larger than a one-yuan coin. The specific size is 30mm in diameter and 3mm in thickness. , machine models, pasted on the back of cards for teaching purposes, or to make various refrigerator magnets, etc....

N52 Grade Irregular Magnetic Connector Convex Trapezoid Magnet

Today's product is used in magnetic connectors. The shape is a bit like a T shape, with beveled corners. The surface coating is nickel copper nickel. The magnet grade is N52. If you are interested in the product, you can contact the Courage magnet manufacturer to process it for you....

Small bar rare earth neodymium magnet 1.65x1.65x12mm

This is a small bar (rod) neodymium magnet, the size is 12mm in length, 1.65mm in width and thickness, the length direction is magnetized, the strong magnetic surface is 1.65x1.65, the surface is treated with nickel copper nickel, the surface magnetic field intensity is about 2210 gauss, suitable for all kinds of electronic parts,...