The difference between synchronous motors, the difference between synchronous motors and asynchronou

The main difference between cryogenic servo motors and normal motors is the temperature range in which they are designed and used. Ordinary Motors: Ordinary motors are motors that typically operate at room temperatures and are designed and manufactured with the temperature conditions of general industrial and household applications in mind.

The temperature range of these motors is typically 0??c (Celsius) to 40??c.

In this range, the performance and reliability of ordinary motors can be well guaranteed. Low-temperature motors: Low-temperature servo motors are specially designed and manufactured for use in low-temperature environments.

These motors are capable of operating in more extreme low temperature conditions and have higher cold resistance. Their temperature range is usually -40??c or lower, e.g. -60??

c。Low-temperature motors play an important role in applications such as extremely cold regions, high altitudes, refrigeration industry and scientific experiments...

The biggest difference between synchronous motor and asynchronous motor is whether their rotor speed is consistent with the stator rotating magnetic field, the rotor speed of the motor is the same as the stator rotating magnetic field, which is called synchronous motor, and vice versa, it is called asynchronous motor.

In addition, the stator windings of synchronous motors and asynchronous motors are the same, the difference is in the rotor structure of the motor. The rotor of an asynchronous motor is a short-circuited winding that generates an electric current by electromagnetic induction. The rotor structure of the synchronous motor is relatively complex, with DC excitation winding, so it needs to add an external excitation power supply to introduce current through the slip ring; Therefore, the structure of the synchronous motor is relatively complex, and the cost and maintenance cost are relatively high.

The speed of the synchronous motor is synchronized with the electromagnetic speed, and the speed of the asynchronous motor is lower than the electromagnetic speed, regardless of the load size of the synchronous motor, as long as it does not lose step, the speed will not change, and the speed of the asynchronous motor will always change with the change of the load size.

The synchronous motor has high precision, but the construction is complex, the cost is high, and the maintenance is relatively difficult, while the asynchronous motor is slow to respond, but it is easy to install and use, and at the same time it is cheap. Therefore, synchronous motors are not as widely used as asynchronous motors.

Synchronous motors are mostly used in large generators, while asynchronous motors are almost used in electric airports.

The synchronous machine and the asynchronous machine, both AC motors, take advantage of an interesting feature of three-phase AC: in simple terms, if the three coils are arranged like a stirrer (the kind used to break eggs at home), the three coils do not touch each other, and the ABC three-phase voltage is applied respectively, so that the three-phase current is generated, and then something interesting happens. **A rotating magnetic field with the same frequency as the applied voltage appears in the space enclosed by the coil (so for a more in-depth explanation, one embeds the coil into the stator as described above, and then generates a rotating magnetic field in the space where the rotor is located.)

With this magnetic field, it's easy to do. We can imagine an invisible magnet spinning at the stator. At this time, if the rotor is a magnet, then the rotor will be moved, i.e. the motor.

Conversely, if the rotor drives an invisible magnet, it becomes a generator (first of all, the rotor drives the virtual magnet, so the rotor must be subjected to a resistance moment, and the virtual magnet is subjected to a power moment. Attention! It is an intermediary (or sign) of the conversion of force and energy.

After all, the virtual magnet is virtual, and the stator does not move, so the stator must get the electromotive force. If the stator has a load, there will be a current or three phases. If there is an electric current, there will be a magnetic field, and the magnetic field will interfere with the magnetic field generated by the rotor.

This is called an armature reaction. Therefore, the electromotive force obtained at the stator with load is different from the electromotive force obtained at no load).

Under the guidance of the above principle, if the rotor is made into an electromagnet and supplied by a separate power supply, then this kind of motor is called a synchronous machine. The reason why it is called a synchronous machine is because the magnetism of the rotor is generated independently, so the rotor can reach the speed of that virtual magnet. It is good that the rotor generates electricity independently, which is convenient for the synchronous machine to adjust, such as reactive power.

Later, it was discovered that it was possible to make a rotor into a squirrel cage without an electromagnet. Because the magnetic field lines of the virtual magnet will cut the cage strip of the squirrel cage, the great right hand rules over it, and then an electric current will be generated. Upon closer inspection, you will see that this current is also three-phase.

Therefore, similar to the principle that the stator generates a magnetic field, the rotor also produces a virtual magnet that rotates around it. Dig deeper, and you'll find that the virtual magnets of the stator and rotor rotate at the same speed in space. Therefore, the function of the squirrel cage is similar to that of the electromagnet, but the current of the squirrel cage is caused by its relative motion with the stator virtual magnet, so the virtual magnet of the squirrel cage is not independent, and the rotation speed of the squirrel cage is always slower than that of the stator virtual magnet, and the synchronous speed cannot be reached (otherwise, there is no relative motion, no current, and no magnetic field of the squirrel cage).

In the analysis, synchronous motors have a magnetic field independent of the rotor, just like the active load in the circuit. An asynchronous motor, because everything in the rotor is generated by the stator, is equivalent to a passive load. Of course, synchronous motors are more complex in design.

What is the difference between synchronous motors and asynchronous motors?

First, the difference in speed:

If you look at this title, you can see that the biggest difference between them is "synchronous and asynchronous". The so-called synchronization, as the name suggests, means that the speed of the rotating magnetic field generated by the three-phase current of the stator winding of the synchronous motor is exactly the same as the speed of the rotor magnetic field. This is not the case with asynchronous motors, where the speed of the rotor is not the same as the speed of the stator rotating magnetic field, and is always lower than the speed of the stator magnetic field.

Second, the difference in cost:

The manufacturing process of synchronous motors is complex, and the required accuracy is higher than that of asynchronous motors, which is time-consuming and laborious to maintain, and is expensive. Asynchronous motors are slower than synchronous motors, but they are easy to install and use, and at the same time, they are cheap and widely used.

3. Difference in performance:

The speed of the synchronous motor cannot change with the change of load, the speed is constant, but the power factor can be adjusted. The speed of the asynchronous motor can be adjusted with the change of load, especially the winding asynchronous motor, there are many ways to regulate the speed, and the starting torque is large.

Fourth, the difference between the places of use:

Asynchronous motors are mainly used to drive machine tools, water pumps, air compressors, blowers, large lifting equipment such as hoists, etc. In the electric drag machinery, about 95% of it is driven by asynchronous motors, and the usage is relatively large. Due to the constant speed, synchronous motors are mainly suitable for high-power production machinery that require constant speed, such as continuous rolling mills, ball mills, etc.

It is expensive to build and difficult to maintain, so synchronous motors are rarely used.

Synchronous motors, like induction motors, are commonly used AC motors. The characteristics are: when the steady-state operation, there is a constant relationship between the speed of the rotor and the frequency of the gridn=ns=60f p, and ns is called synchronous speed.

If the frequency of the grid is constant, the speed of the synchronous motor is constant at steady state, regardless of the size of the load. Synchronous motors are divided into synchronous generators and synchronous motors.

Asynchronous motors. The speed of the motor is less than the speed of the rotating magnetic field, so it is called an asynchronous motor. It's basically the same as an induction motor. s=(ns-n) is the slip rate, ns is the speed of the magnetic field, and n is the speed of the rotor.

The difference between synchronous motor and asynchronous motor is: different rotor magnetic field direction, different rotor structure, and different reactive power.

First, the direction of the rotor magnetic field is different.

1. Synchronous motor: The rotor speed of the synchronous motor is the same as the rotating magnetic field of the stator.

2. Asynchronous motor: The rotor speed of the asynchronous motor is opposite to the magnetic field of the stator rotation.

Second, the rotor structure is different.

1. Synchronous motor: The rotor structure of the synchronous motor is relatively complex, with DC excitation winding, so it needs to add an excitation power supply and introduce current through the slip ring.

2. Asynchronous motor: The rotor of the asynchronous motor is a short-circuit winding, which generates current by electromagnetic induction.

Third, the reactive power is different.

1. Synchronous motor: synchronous motor can emit reactive power or absorb reactive power.

2. Asynchronous motor: Asynchronous motor can only absorb reactive power.

There are three main modes of operation of synchronous motors, namely, as generators, motors, and compensators.

What is a synchronous motor? A synchronous motor is also a type of AC motor. It is mainly used for generators, but also for motors, and is generally used for production machinery with large power and speed that does not require adjustment, such as large water pumps, air compressors and mine ventilators.

In recent years, due to the development of permanent magnet materials and electronic technology, micro synchronous motors have been more and more widely used. One of the characteristics of synchronous motor is that there is a strict and constant relationship between the speed of the old closed bridge n and the frequency f1 of the stator current during stable operation, that is, n=60f1 p=n0 The speed n of the synchronous motor is the same as the speed n0 of the rotating magnetic field. Hence the name "synchronicity".

Needless to say, the stator of the synchronous motor also needs to be energized to keep it synchronized with the stator. (The rotor of the micro synchronous motor can be made of permanent magnet magnets).Asynchronous motors are different, the stator windings are energized to generate a rotating magnetic field, and an inductive state response current is generated in the rotor to rotate the motor.

The structure is simpler than that of synchronous motors. What is an asynchronous motor? The asynchronous motor is an AC motor based on the interaction between the air-gap rotating magnetic field and the induced current in the rotor winding to generate electromagnetic torque, so as to realize energy conversion.

Since the rotor winding current is induced, there is a certain difference between its rotational speed and synchronous rotational speed. Difference Between Asynchronous Motor and Synchronous Motor: The number of revolutions is fixed during the normal operation of the synchronous motor and does not change due to the change of load.

The number of revolutions is not fixed during normal operation of the asynchronous motor, but will change slightly due to the change of load. Synchronous motors have complex circuits and reversible energy (motors and generators are theoretically interchangeable) and are mostly used as generators.

Synchronous motors and asynchronous motors are two common types of motors that differ in many ways.

A synchronous motor is a motor in which the rotational speed of the motor is synchronized with the AC frequency of the power supply.

In synchronous motors, the rotational speed of the rotor is the same as the rotational speed of the power supply, and the relative velocity between them is zero.

The main advantages of synchronous motors are their ability to provide stable output speed and high power factor.

They are often used in applications that require precise control of rotational speed, such as in power systems to regulate voltage and frequency.

An asynchronous motor is a motor in which the rotation speed of the motor is not synchronized with the AC frequency of the power supply.

In an asynchronous motor, the rotational speed of the rotor is less than the rotational speed of the power supply, and the relative velocity between them is not zero.

The main advantage of asynchronous motors is that they can withstand large overloads and shocks, and have good starting performance.

They are often used in applications that require heavy loads, such as in industrial production and transportation to drive pumps, fans, and other mechanical equipment.

In addition to the difference in rotation speed, there are some other differences between synchronous and asynchronous motors.

For example, synchronous motors are more complex in structure than asynchronous motors, and they are more expensive to manufacture.

In addition, synchronous motors need to keep the rotation speed of the power supply stable during operation, and asynchronous motors can operate at different power supply frequencies.