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The connection between electricity, magnetism and motion was first discovered in 1820 by French physicist André-Marie Ampère (1775-1867), which is the basic science behind electric motors. However, if we want to turn this amazing scientific discovery into more practical technology to power our electric lawn mowers and toothbrushes, we must develop it further. The inventors who did this were the British Michael Faraday (1791-1867) and William Sturgeon (1783-1850) and the American Joseph Henry (7977-1878) year). The electric motor is how they realized their outstanding invention. Do you know what an electric motor is? Let us continue reading.

This passage is going to talk about the followings of electric motor:

(1)Introduction to electric motor

(2)The working principle of electric motor

(3)Advantages and disadvantages of electric motor

 

(1)Introduction to electric motor

Electric motor is a widely used electric tool.

An electric motor is a device used to convert electrical energy into mechanical energy, as opposed to a generator. They operate using electromagnetic principles, which state that force is applied when there is an electric current in a magnetic field. This force generates torque on the wire loops present in the magnetic field, which causes the motor to rotate and perform useful work. Electric motors have a wide range of uses, such as fans, power tools, electrical appliances, electric cars and hybrid cars.

 

(2)The working principle of electric motor

How do electric motors work?

Electric motors have many different working parts so that they continuously rotate and provide power as needed. Electric motors may operate under direct current (DC) or alternating current (AC), both of which have their advantages and disadvantages.

The main components of DC motors include:

Stator: The stationary part of the motor, especially the magnet. Electromagnets are usually used to provide more power.

Rotor: A coil mounted on the axle and rotating at high speed to provide rotating mechanical energy for the system.

Commutator: This component is the key to DC motors. Without it, the rotor will not be able to continuously rotate due to the reaction force generated by the constantly changing current. Whenever the coil rotates half a turn, the commutator reverses the current, which causes the rotor to rotate.

Power supply: Provide electromotive force to make current flow in the system.

Brushes: These brushes are connected to the terminals of the power source to allow electrical energy to flow into the commutator.

 

(3)The wide usage of electric motors

As a typical induction motor, electric motors are widely used.

Electric motors have many uses, ranging from heavy industries to small toys. Different types of electric motors will be selected in different environments. Here are some examples: Wind-making equipment, such as electric fans, electric toy cars, boats, etc. Lifts, elevators, electric vehicles, such as subways, tram factories, and hypermarkets. It is also used in electric automatic doors and electric rolling shutters on buses.

Not only that, optical drives, printers, washing machines, water pumps, disk drives, electric razors, tape recorders, video recorders, CD players, and other industries often see electric motors.

Fast elevators, machine tools (such as machine tools), textile machines, and mixers also need electric motors to drive.

 

Get instant power at the touch of a switch-our ancestors will love electric motors! You can find them in everything from electric trains to remote-controlled cars, and you might be surprised by their universality. How many motors are there in your room now? You may have two in your computer for beginners, one for spinning hard drives, and the other for powering cooling fans. If you sit in the bedroom, you will find motors in hair dryers and many toys; in the bathroom, they are in exhaust fans and electric shavers. In the kitchen, almost all appliances from washing machines, dishwashers to coffee grinders, microwave ovens and electric can openers are equipped with electric motors. If you need an electric motor, please contact us and we will serve you wholeheartedly.

An Ac motor is a motor driven by alternating current (AC). Ac motors are widely used in industry mainly because of their high efficiency and the ability to generate constant torque up to the rated speed. The two most widely used types of Ac motors are induction motors and synchronous motors. We will briefly describe how they work.

(1) How do Ac motors work?

(2) How is the Ac motor controlled?

(3) Difference between Ac motor and DC motor

 

(1) How do Ac motors work?

The two basic components of an Ac motor are the stator (fixed outer drum) and the rotor. The rotating interior of the motor, which is connected to (and drives) the motor shaft. Both the stator and the rotor generate a rotating magnetic field. In the windings of the stator, the rotating magnetic field is inherently provided by the sinusoidal characteristics of alternating current. In the rotor, the magnetic field is generated by permanent magnets, reluctance salient poles or other electrical windings.

Because the rotor of a synchronous motor has permanent magnets or electromagnets, they will generate a rotating electromagnetic field, so they operate synchronously with the frequency of the supply current in a locked state.

In an induction motor, the magnetic field in the rotor winding is "induced" by the magnetic field of the stator. In order for this induction to generate torque, the speed of the rotor magnetic field must lag behind the speed of the stator magnetic field. This speed difference is called "slip", which is why induction motors have a "nameplate RPM" rating, which is about 5% smaller than its synchronous speed. For example, Ironhorse model MTRP-001-3DB18 (1 horsepower, three-phase, four-pole, AC induction motor) has a synchronous speed rating of 1800 RPM (assuming a power of 60hz), but the "nameplate RPM" rating is 1760. When using the American standard 60 Hz three-phase power "across the line" power supply, the shaft will rotate at 1760 RPM.

 

(2) How is the Ac motor controlled?

When simple on/off control is required, contactors or manual motor starters are usually used. Contactors (large three-phase relays) allow PLCs or other controllers to switch power to Ac motors. Reverse motor starters are a dedicated version with two connected contactors, so they also allow the direction of rotation of the motor shaft to be reversed. The manual motor starter includes a manual knob that allows the operator to switch power. All of these types are called "across the wire" control-the motor is directly connected to the input power "line" (via a contactor or motor starter).

 

(3) Difference between Ac motor and DC motor

Historically, industrial DC motors have always been brushing types. Compared with Ac motors, DC motors with brushes and commutators have many disadvantages: increased maintenance (brush replacement), limited speed range and shorter overall life. AC induction motors have no brushes and have a longer service life.

The speed of the DC motor is controlled by changing the armature current, while the speed control of the Ac motor is achieved by changing the frequency of the alternating current, usually using a variable frequency drive (VFD).

In the past few decades, the advent of brushless DC motors has begun, mainly due to the appearance of semiconductor control circuits required to operate them and the appearance of high-quality permanent magnets. Brushless DC motors do not require brushes or physical commutators, so they have a longer service life. They also overcome the speed limitation of the brushed version.

 

If you want to specify a motor for a new application, first determine the voltage, speed and horsepower required, and the type of application. If you want to replace a motor of the right size in an existing application, you can find all the necessary information on the motor nameplate of the existing motor. If you have any needs, you can contact us.

We plan to travel to Brazil to visit our important and trusted customers in July. We will keep on friendly and trusted cooperation with each other.

We plan to know shaded pole motor assembly and applicaiton condition, know more about this kind of shaded pole motor market development.

We would like to negociate further win-win cooperation with Brazilian customers.

Cordless drills with brushless motors have come out in the past ten years and have quickly developed on traditional brush models. Now, they occupy 30% to 50% of the cordless electric drill market. "Consumer Reports" cordless drill market analyst Courtney Pennicock said: "They are also the fastest growing market segment."

What are the advantages of brushless power tools? These more efficient and durable power tools are entering the DIY market. So how do they work?

This passage is going to talk about the followings of brushless motor:

(1) Winding failure of brushless motor

(2) How does the brushless motor work?

(3) Should you get a brushless electric drill?

 

(1) Winding failure of brushless motor

Recently, in the field of electric tools, there have been many discussions about brushless motors. The manufacturer claims that brushless tools have higher performance and durability, and are smarter than ordinary tools. So, what is the technology behind these new motors?

 

(2) How does the brushless motor work?

The brushless motor has lost its brushes and commutator. The positions of the magnet and the winding are also opposite: the magnet is on the traditional motor shaft, and the copper winding of the armature is fixed and surrounds the shaft. Smaller circuit boards replace brushes and commutators to transfer energy to the windings.

Since the electronics communicate directly with the fixed windings, the tools can be adjusted to the task, which is why the company refers to these tools as "smarter" tools. For example, if you use a brushless drill to screw a screw into the Styrofoam, it will more easily feel the lack of resistance (compared to a brushed motor) and start to consume very little power from the battery. If the tool then starts to insert 3-inch screws into mahogany, it will adjust accordingly and draw more current. In contrast, a brushed motor will always run as fast as possible when in use.

In addition, the brushless motor can be more powerful overall. Since the copper windings are located outside the motor configuration, there is a lot of room to increase them. Brushless motors also have no friction and voltage drop caused by brushes dragging the rotating commutator. During operation, this physical contact causes continuous energy loss. The net benefit is a tool with higher efficiency and a more durable motor.

Brushless motors will continue to exist, but due to cost and other reasons, it may take a while for the technology to filter all the power tools used by weekend DIYers.

 

(3) Should you get a brushless electric drill?

At present, brushless electric drills are mainly classified as heavy and general purpose rather than light. Therefore, if you are working on a lot of serious projects that require drilling, then using brushless software may make sense. It can provide you with higher speed and power, and requires less maintenance. However, if you are a DIYer working on lighter projects, you may not notice a big difference.

Homeowners who don't use brushless drills often may not notice the benefits of longer service life or longer run time, but they will immediately notice that they are lighter and smaller than the old brushed varieties. If you want to go further, you can browse our website or contact us.

 

In terms of performance, reliability and durability, brushless motors have multiple advantages. Brushless motors are more energy-efficient, more responsive, and able to pack more power, torque and speed. And the brushless motor is easier to maintain, smaller and lighter, and the friction-lessness in the brushless bit means less wear and less heat. Can better prevent dust and debris. Although the price is slightly higher, but this is a guarantee of quality.

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