Do motors have to have two permanent magnets, and are the directly connected motors permanent magnet

An electric motor doesn't have to have two magnets. Many motors, such as electromagnetic AC and DC motors, ultrasonic motors, some stepper motors, etc. Only magnetoelectric motors require permanent magnets, and some do not have to be two.

An electric motor is a device that converts electrical energy into mechanical energy.

It uses an energized coil (that is, the stator winding) to generate a rotating magnetic field and acts on the rotor (such as a squirrel cage closed aluminum frame) to form a magnetoelectric dynamic rotational torque.

The motor is divided into DC motor and AC motor according to the different power sources, and most of the motors in the power system are AC motors, which can be synchronous motors or asynchronous motors (the magnetic field speed of the stator of the motor is not synchronized with the rotation speed of the rotor).

The motor is mainly composed of a stator and a rotor, and the direction of the energized wire in the magnetic field is related to the direction of the current and the direction of the magnetic inductance line (magnetic field direction).

The working principle of the motor is that the magnetic field acts on the force of the electric current, which makes the motor rotate.

Permanent magnets refer to a class of substances with long-term magnetic properties. After a magnet (usually an alloy of rare earth metals and transition metals with special configurations) is demagnetized at a certain temperature and magnetic field, it can still maintain its magnetic properties without being affected by the external magnetic field, and a type of magnet that permanently maintains its magnetism is called a permanent magnet or permanent magnet.

It does not depend on an externally applied magnetic field and can still generate a magnetic field on its own.

Permanent magnets have the characteristics of low coercivity of soft magnets and high coercivity of hard magnets, and are important basic materials for modern industry, electrical, electronic and various high technologies.

Not all direct-attached motors are permanent magnet motors. Direct-connected motor means that the rotor of the motor is directly connected to the load, eliminating the need for a deceleration mechanism, so it has the advantages of high efficiency, high precision, small size, and low noise. Common types of direct-connected motors include permanent magnet direct-attack round silver current motors, induction motors, brushless DC motors, etc.

Permanent magnet DC motor is a kind of motor that uses permanent magnet as the excitation source, which has the advantages of simplicity, reliability and compact structure. Due to the high magnetic flux density of permanent magnets, permanent magnet DC motors have the characteristics of high torque and high power density, and are widely used in machine tools, robots, textile machinery, wind power generation and other fields.

An induction motor is an asynchronous motor that converts the imitation field of a rotating magnetic cavity into torque, and there is no permanent magnet on its rotor, which needs to work through external electromagnetic induction. Induction motors have the advantages of simple structure, low cost and high reliability, and are widely used in household appliances, industrial production lines, water pumps, paiyan fans and other fields, but their speed range is relatively narrow.

The brushless DC motor adopts electronic commutation, eliminating the mechanical commutator, so it has the advantages of high speed, high efficiency and long life. Brushless DC motors also usually have permanent magnets on their rotors, called permanent magnet brushless DC motors, which can also be used for direct load applications.

Therefore, different types of direct-coupled motors have different structures and characteristics, and some of them may use permanent magnets as the excitation source, but not all direct-attached motors are permanent magnet motors.

Does the permanent magnet synchronous generator have magnets, the rotor and stator inside the permanent magnet generator itself have magnets, so it is called a permanent magnet generator, and it will not lose magnetism if it is not used for a long time, and the generator it excites will lose magnetism, I hope it can help you. If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. Finally, I wish you good health and a good mood!

Summary. Hello, dear. Permanent magnet synchronous generators have magnets, that is, permanent magnets.

Do permanent magnet synchronous generators have magnets.

Hello, dear. Permanent magnet synchronous generators have magnets, that is, permanent magnets.

The permanent magnet synchronous motor provides excitation with a permanent magnet, which makes the motor structure relatively simple, reduces the processing and assembly costs, and omits the collector ring and brushes that are prone to problems, and improves the reliability of the motor operation.

Kiss. What's wrong.

Do you know how much a ton can be dismantled?

It's not good to say, dear. It's not all permanent magnets, there are other materials. However, the permanent magnet ** is almost 2000-3000 a ton, depending on the actual situation.

The working principle of the asynchronous motor is: the rotating magnetic field, cutting the rotor winding, the rotor winding generates an induced electromotive force, so that there is an induced magnetic field, and the two magnetic fields rotate under the interaction. The synchronous motor is a rotating magnetic field, driving an existing magnetic field, if the synchronization is lost, the torque will inevitably change, and it will be in an abnormal state.

Therefore, the permanent magnet motor must be a synchronous motor.

The permanent magnet motor can be a synchronous motor or a DC motor, and it must not be an asynchronous motor.

When the synchronous motor starts, there is an asynchronous to synchronous process, after the start is completed, the motor generally cannot be out of step, unless there is a special need, the out of step is not an abnormal state.

Hello, permanent magnet motors include permanent magnet generators and permanent magnet motors, and the common permanent magnet generators are the ones used in cars and tractors. Common permanent magnet motors are fans on computer hosts or small DC motors on children's toy cars.

Permanent magnet generators are synchronized, there is no doubt about it. If the drag of the machine is greater than the torque of the synchronous motor, the motor will lose step and stop rotating, and if it continues to be energized, it will burn out.

After losing step, it must be turned up with the help of an external force before it can return to its initial state.