A: The rotary motor whose output or input is DC electrical energy is called DC motor
2, what is AC motor
A: The rotary motor whose output or input is AC electrical energy is called AC motor.
3, what is a stepper motor
A: stepper motor is a kind of electrical pulse into an angular displacement of the actuator. In layman's terms: when the stepper driver receives a pulse signal, it drives the stepper motor in a set direction to turn a fixed angle (and step angle). You can control the number of pulses to control the amount of angular displacement, so as to achieve the purpose of accurate positioning; at the same time, you can control the frequency of pulses to control the speed and acceleration of motor rotation, so as to achieve the purpose of speed regulation. There are three types of stepper motors: permanent magnet (PM), reactive (VR) and hybrid (HB). Permanent magnet stepping is generally two-phase, torque and volume is small, step angle is generally 7.5 degrees or 15 degrees; reactive stepping is generally three-phase, large torque output can be realized, step angle is generally 1.5 degrees, but the noise and vibration are very large. In Europe and the United States and other developed countries in the 80's has been eliminated; hybrid stepping refers to a mixture of permanent magnet type and the advantages of reactive type. It is divided into two-phase and five-phase: two-phase stepping angle is generally 1.8 degrees and five-phase stepping angle is generally 0.72 degrees. This kind of stepper motor is the most widely used.
4, what is a servo motor
A: servo motor, also known as the executive motor, in the automatic control system, used as an executive element, the received electrical signals are converted into an angular displacement on the motor shaft or angular speed output. Divided into two categories of DC and AC servo motors, its main feature is that when the signal voltage is zero no self-rotating phenomenon, the speed of the torque with the increase of a uniform decrease in speed,
5 asynchronous motors are used only for electric motors, rarely used as a generator, are synchronous motors are used to generate electricity.
The principle of asynchronous motor is mainly to pass 3-phase alternating current in the stator to produce a rotating magnetic field at n0, the synchronous speed. Different pairs of magnetic poles p, under the action of alternating current with the same frequency f=50Hz, will produce different n0, n0=60f/p.
The working principle is as follows:
Symmetrical 3-phase windings are energized with symmetrical 3-phase currents, which generate a rotating magnetic field, and the magnetic field lines cut rotor windings, which, according to the principle of electromagnetic induction, produce e and i in the rotor windings, and rotor windings are subject to the The rotor winding is subjected to electromagnetic force in the magnetic field, i.e., electromagnetic torque is generated, which makes the rotor rotate, and the rotor outputs mechanical energy to drive the mechanical load to rotate.
The rotor speed nlt;n0, so it is called asynchronous motor. s=(n0-n)/n0, known as the rate of rotation, is the asynchronous motor (motor) of an important parameter. sN is the rated rate of rotation.
Then say synchronous motor:
Synchronous motor for generator operation, rotor winding work with DC excitation, driven by external mechanical force rotor rotation, n0 direction and torque T direction opposite, stator induced electromotive force (principle of electromagnetic induction), and then output voltage.
Synchronous motor as a motor operation, the rotor winding work with DC excitation, the stator through the 3-phase alternating current, generating a rotating magnetic field, driving the rotor synchronous rotation.
ADDITIONAL NOTES:
There are many forms of generators, but their operating principles are based on the laws of electromagnetic induction and electromagnetic force. Therefore, the general principle of its construction is that suitable magnetically conductive and electrically conductive materials are used to form magnetic and electrical circuits that perform electromagnetic induction on each other in order to generate electromagnetic power for the purpose of energy conversion.
The classification of generators can be summarized as follows:
Generator { DC generator
Alternator { Synchronous generator
Asynchronous generator (seldom used)
Alternators can also be divided into single-phase generators and three-phase generators.
Synchronous motor and asynchronous motor difference: (This is the explanation given by three online users)
1, synchronous and asynchronous the biggest difference lies in the rotor speed of his door is not the same as the stator rotating magnetic speed, if the rotor rotating speed and the stator is the same, then it is called a synchronous motor, if it is not consistent, it is called an asynchronous motor.
2, when the number of pole pairs is certain, there is a strict relationship between the speed and frequency of the motor, in motor terminology, synchronous. Asynchronous motors, also called induction motors, are mainly used as electric motors, which always operate at a rotor speed less than that of a synchronous motor.
3, the so-called "synchronous" is the armature (stator) winding current flow, will form a rotating magnetic field in the air gap, and the direction of rotation of the magnetic field and rotational speed with the rotor steering, rotational speed is the same, so it is synchronous.
Asynchronous motor, then, its rotating magnetic field and the rotor there is a relative speed, that is, to produce pitch.
As to why the asynchronous motor and synchronous motor will have such a difference, I'll summarize, the most fundamental reason in fact is that the stator has no excitation, do not add the excitation for asynchronous, should only produce relative motion, there will be cutting the role of magnetic inductance (or flux changes), will produce electromagnetic induction (i.e., Ampere force). And with the addition of excitation, the stator can be seen as a magnet with fixed NS poles that will rotate synchronously with the rotating magnetic field, hence the name synchronous motor. (The attraction of the magnet)