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Electricity is an indispensable part of our lives. The domain is as big as going into space, and as small as static electricity when undressing. We use electricity in all aspects of our lives, and we cannot do without electricity. For example, household electricity, factory electricity, and driving vehicles. For such an important electricity, it is very important to learn some necessary knowledge about electricity usage. Here I will introduce all the knowledge and common sense about electric motor boundaries encountered in an empirical way for your reference, I hope it will be helpful to you.
The single-phase electric motor uses a power supply consisting of a live wire and a neutral wire to work. So, connect the power cord first. Although there is a red line and a blue line, there is no difference in position, that is, the two lines in the picture can be interchanged. There is no distinction between zero line and hot line. A single-phase motor also relies on the coil to generate a magnetic field to make the motor rotate. Since single-phase electricity has no phase difference, it must have a phase difference like three-phase electricity to rotate. So, a single-phase motor also has at least two sets of coils. It can be rotated by generating a phase of 90 degrees.
(2)Steps to wire an electric motor
Before wiring any AC motor, be absolutely sure to remove all electricity from the motor circuit. Turn on the circuit breaker that will provide power. Mark the circuit breaker to ensure that power is not accidentally restored to the circuit.
Check the motor manufacturer's manual for advice on proper wiring for your application. If the motor does not have a manual, please look for the connection diagram somewhere on the motor. The schematic can be on the outside of the motor, or under the inspection board or cover of the motor.
For connection diagrams of most modern motors, see the following link in the references section. Find the correct wiring for your specific motor. For example, if the motor is single-phase, single-voltage, and you want it to rotate counterclockwise, the graph will show that the input power is connected to L1 and L2. For CCW rotation, wires 1 and 8 are connected together, and wires 4 and 5 are connected together.
Open the motor cover to access the motor terminals. Strip the end of the power cord and crimp the terminal. Connect the wires to the motor terminals. Use a wire cap to connect the wires together for proper rotation.
After the wiring is complete, replace the cover and energize the motor circuit. Make sure the motor is running in the correct direction.
(3)Working principles of electric motor
The basic idea of an electric motor is very simple: you plug in electricity at one end and rotate the shaft (metal rod) at the other end to provide you with the power to drive a certain machine. How does this work in practice? How exactly do you convert electricity into exercise? In order to find the answer, we must go back nearly 200 years.
Suppose you take a piece of ordinary wire, make it into a large loop, and place it between the poles of a powerful permanent horseshoe magnet. Now, if you connect both ends of the wire to the battery, the wire will jump up briefly. When you saw this for the first time, it was amazing. It's like magic! However, this is a completely scientific explanation. When the current starts to creep along the wire, it generates a magnetic field around the wire. If the wire is placed near a permanent magnet, this temporary magnetic field will interact with the magnetic field of the permanent magnet. You will know that two magnets placed close to each other will attract or repel each other. Similarly, the temporary magnetism around the wire attracts or repels the permanent magnetism in the magnet, which is the cause of the wire jumping.
DC motor is powered by direct current while ac motor is powered by alternating current. From the constructure, principle of dc motor is relative simple with complex constructure, not suitable to maintain. But ac motor has complex principle with simple constructure. It is convenient to maintain. From the aspect of pricing, the pricing of dc motor is higher than the pricing of ac motor in same power as well as adjustable speed device. At the same time contructure and maintenance has great difference. From the aspect of performance, dc motor has steady speed and can control the speed accurately which can not reach by ac motor. Under this condition, we only consider the adoption of dc motor not ac motor.
But we have to recognize ac motor is adopted widely since most of chemical plants use alternating current even though its adjusting speed is complex.
Five main trend application condition For Brushless DC motor
Micro motor market in China is developing more and more fast in rencent years. Instead of DC motor, Brushless DC motor features a great advantages of high efficiency and low noise with high market share,especially in export market.
Brushless DC motor is mainly used in condition as follows:
1. Brushless DC motor for industrial equipment
High efficiency, precision and performance for equipment is requested in industrial application reaching to quick and highly efficient work. To control speed and find exact position, some light industry prefer to choose this motor.
2. Brushless DC motor for automobile industry
With a trending of energy-saving and environmental protection from atoumobile industry, permanent magnet motor within Brushless motor is widely used in this field.
3. Brushless DC motor for medical apparatus
With the improvement of life quality and development of domestic medical level, Brushless DC motor can rescue hidden trouble from medical process, such as noise, brush etc.
4. Brushless DC motor for Household appliances
Traditional compressor motor is mainly used in air condition and refrigerators. Due to voltage and power, it result in low efficiency. Brushless DC motor coming has great influence on people life and improve human life quality, applying in table fan, vacuum cleaner, ain condition etc.
5. Brushless DC motor for electric car
Brushless DC motor starting magnetic motor integrate brushless dc starting motor with magnetic motor, saving reducer parts and improving operating reliability.
After the motor coil is energized, it is rotated by the force of the magnetic field, and its coil cuts the magnetic line of induction. According to the phenomenon of electromagnetic induction, it does not produce an induced current. This current, together with the current passing through it, does not increase the current passing through the coil. The coil is rotated by the force of the magnetic field again. Why is the direction of the induced current generated by the coil being rotated by the current and cutting the magnetic induction line in the opposite direction? Can electric motors generate electricity?
This passage is going to talk about the followings of ac motor:
(1) Principle of Ac motor
(2) Generator is not motor
(3) How do electric motors generate electricity?
Principle of Ac motor
According to the left-hand rule and the right-hand rule, the current directions of the coils are indeed opposite.
However, the motor will not stop rotating because of this, it will keep rotating and output power to the outside. The reason is that the current that causes the coil of the motor to be subjected to ampere force is generated by the applied electromotive force. When the applied electromotive force forces the coil current to flow in one direction, the electromotive force generated by electromagnetic induction at this time has a tendency to weaken the coil current. But it is never possible to overcome the additional electromotive force, otherwise an ideal state without any energy loss will appear. The final effect is that the current in the coil always flows continuously in the direction of the applied electromotive force.
Electric motors equipped with permanent magnets can generate electricity, the principle is electromagnetic induction. However, the alternator made by using the "squirrel cage principle" generally cannot be directly used as a generator because it lacks the necessary circuitry to make the coil a controllable electromagnet.
Generator is not motor
An electric motor is a device that converts electrical energy into mechanical energy. It uses energized coils (that is, stator windings) to generate a rotating magnetic field and act on the rotor squirrel-cage closed aluminum frame to form magneto-electric power rotating torque. Motors are divided into DC motors and Ac motors according to different power sources. Most of the motors in the power system are Ac motors, which can be synchronous motors or asynchronous motors (motor stator magnetic field speed and rotor rotation speed do not maintain synchronous speed). The motor is mainly composed of a stator and a rotor. The direction of the force movement of the energized wire in the magnetic field is related to the direction of the current and the direction of the magnetic line of induction (magnetic field direction). The working principle of the motor is the action of the magnetic field on the force of the current to make the motor rotate.
How do electric motors generate electricity?
Ac motors rely on electricity to provide a magnetic field for work, but they must first have a magnetic field to generate electricity.
Specific to different motor power generation methods have their own characteristics. For permanent magnet motors, because they have a native magnetic field (permanent magnets have a magnetic field), rotating the motor in any direction without energization can generate electromotive force in the windings to generate electricity. Similarly, AC synchronous motors are exciting When the winding is energized, it is basically the same when the working winding is not energized. When the AC asynchronous motor is not energized, because there is no magnetic field, the rotating motor will not generate electricity. When it is energized, in the four quadrants of the motor operation, the two external mechanical energy can generate electricity when the output power of the motor is greater than the output power of the motor. The same applies when the magneto is energized. The situation of DC motor is more complicated, so I won't describe it. Therefore, it is not that the motor can generate electricity by reversing.
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