Solution
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FAQ
If a DC brushless motor is found to be demagnetized, it is likely that electromagnetic stoppage will occur, and if it is more serious, the motor can only be replaced. So what is the reason for DC brushless motor demagnetization? How to prevent it timely and effectively?
Let's start with the DC brushless motor temperature resistance level! Beyond this temperature resistance value, the magnetic flux density will be affected and fall rapidly. It can be divided into three grades:
1.N series, above 80 degrees;
2. H series, above 120 degrees;
3. SH series above 150 degrees;
The main reasons for DC brushless motor demagnetization:
1, the motor cooling fan is abnormal, resulting in high temperature motor heating;
2, the motor is not equipped with a temperature protection device, resulting in a rise in temperature is not detected in time.
3, the temperature of the environment is too high, resulting in DC brushless motor temperature rise is too high.
4, the motor itself is not reasonably designed and of poor quality.
How to prevent brushless DC motor demagnetization?
1、Correctly select the power of brushless DC motor
Demagnetization is related to the power selection of the motor, correctly selecting the power of the brushless DC motor can prevent or delay demagnetization, overload is the main reason for demagnetization. Therefore, a certain margin should be kept when selecting the motor power, according to the actual situation of the load, generally around 20% is appropriate.
2, avoid DC brushless motor heavy load start or frequent startup
The above is the main reason for DC brushless motor demagnetization and prevention methods, in fact, it is mainly caused by high temperature demagnetization, in the actual operation, we must always observe the temperature rise of the motor, and do a good job in a timely manner in all maintenance work!
In recent years, DC brushless motors are more and more widely used in our life, such as common household appliances (vacuum cleaners, hair dryers, electric toothbrushes, wall breakers, power tools), etc., which bring convenience to our life, so what is a brushless motor? How to adjust the speed and wiring of brushless motor?
Brushless DC motors refer to motors that can convert DC electrical energy into mechanical energy, or mechanical energy into DC electrical energy, and are used in a wide range of applications.
When using a brushless DC motor, you need to adjust the speed, what are the common ways to adjust the speed?
1. Change the resistance of the armature circuit to adjust the speed
Brushless DC motors can adjust the speed by changing the resistance of the armature circuit. With a certain load, the external series resistance gradually increases, the total resistance of the armature circuit increases, and the motor speed decreases.
2. Change armature voltage and speed
Continuously changing the armature supply voltage can make the DC motor realize wide range of stepless speed regulation.
3. Changing the excitation current to adjust the speed
When the armature voltage is constant, changing the excitation current of DC motor can also realize speed regulation.
Brushless DC motor speed control is a very important process, only master these basic knowledge and methods, in order to better use the brushless DC motor, to develop a better quality products.
DC brushless motor stator and rotor, many people are not very clear, often called the stator rotor, rotor called stator, the two can not be distinguished, then what is the DC brushless motor stator and rotor? What is the role? By by which components?
The stator and rotor are essential components on DC brushless motors. The stator is fixed to the casing and is usually wrapped with a coil, which is a stationary part; The rotor is installed on the base through bearings, and there are silicon steel plates on top of the rotor, which is the rotating part. When they work, due to the action of current, the stator generates a magnetic field, which drives the rotor to rotate and converts electrical energy into mechanical energy. Different types of motors have different structures of electrons and rotors, but the same thing is that the stator is stationary and generates a magnetic field; The rotor is rotating and forced to rotate in the magnetic field of the stator. In addition, the fixed number of magnetic poles composed of rotors can also affect the speed and torque of the motor. Magnetic disc: Mainly installed on the rotor, it is an important part of brushless motors, and its performance parameters are mostly related to the magnet, such as power, speed, torque, etc. Silicon steel sheet: It is an important component of brushless motors, and its main function is to reduce the magnetic resistance of the entire system and participate in the magnetic circuit operation. Shaft: It is the direct force bearing part of the motor rotor, and the hardness of the shaft must meet the requirements of high-speed rotation of the rotor. Bearing: It ensures the smooth operation of the motor and can be divided into sliding bearings and rolling shafts. The above is the role of the stator and rotor of a DC brushless motor, which play different roles. In addition, various components work together to coordinate and make the brushless motor operate.
With the continuous development of industry and science and technology, the production of brushless DC motors gradually intelligent, all aspects of performance is also getting better and better, loved by the majority of friends, for the stator and rotor, you may have heard of more, but it is just two terms, is not a very good understanding of the structure of the two components, the following He Hui briefly introduce it to you! I hope to help you!
Based on the law of electromagnetic induction, combined with new electronic and digital technologies, brushless DC motors have great potential for development and are important driving components in modern process production equipment. The interior of a brushless DC motor mainly consists of a stator and a rotor, which cooperate with each other to ensure the normal operation of the motor. So, what is the specific composition of the stator and rotor? 1. The stator of a brushless DC motor is mainly produced by stamping silicon steel sheets, and the number of slots can be determined according to the set requirements. Each slot has a coil, which together forms a coil winding. Most brushless DC motor stators have three star arranged windings, and each winding forms the corresponding number of poles in a specific way. The stator winding is often divided into two types: trapezoidal and sinusoidal. Due to the different connection methods of the winding, the back electromotive force generated is also different, manifested as trapezoidal and sinusoidal waveforms. 2. The rotor of a brushless DC motor is a certain number of permanent magnets, divided into N poles and S poles. The inner rotor is arranged alternately around the rotor, and the outer rotor is attached to the inner wall of the rotor. When applying the magnetic field, it must not be reversed. Special equipment can be used to insert or apply the magnetic steel, and the phase rate is relatively high. After all, manual work is still relatively slow. The above is the composition and structure of the stator and rotor. As key components of a brushless DC motor, the stator and rotor play a crucial role in ensuring the normal operation of the motor.
With the continuous development of science and technology, the motor industry is also constantly updated, many motors are now gradually moving towards miniaturization, micro motor motor wider range of applications, the structure is also simpler, the control is more convenient, many friends often ask how the working characteristics of the micro motor motor? Here is a brief analysis for you!
1. Working characteristics
By determining the relationship between output and input, according to control requirements, some requirements of the static characteristic curve must be met, such as continuity, smoothness, and no sudden changes; For dynamic characteristics, frequency curves or response curves are generally used to determine the stability of the curve, without oscillation points or sudden jumps, and the response curve can quickly converge.
2. Sensitivity
Corresponds to the output amplitude of the unit input signal. Commonly used specific torque, electromotive force, amplification factor, etc.
3. Accuracy
Under certain input conditions, the difference between the actual value of the output signal and the theoretical value represents the accuracy of the micro motor, usually represented by the size of the error.
4. Impedance or resistance
In the system, the input and output impedances of micro motor motors need to match the corresponding circuits to ensure the operational performance and accuracy of the system.
5. Reliability
This is not only a special requirement for controlling micro motor motors, but also a requirement for driving micro motor motors and power micro motors. The commonly used parameters such as lifespan, failure rate, reliability, and mean time between failures determine the operational reliability of micro motor operation.
The above is the analysis of the working characteristics and reliability of micro motor motors. Mastering these basic knowledge can help us better understand micro motor motors, better utilize them, and bring more convenience to production and life!
Brushless motor relative to brush motor, the noise is very small, which is one of the reasons why many friends like it, but sometimes in the use of brushless motor, found that the sound is different from the usual, a little on the large side, it is very noisy, so how does this noise arise? Hohui will briefly introduce it to you!
In fact, the noise of brushless motors is mainly divided into two types, one is mechanical noise, and the other is electromagnetic noise. The specific cause needs to be analyzed. Mechanical noise is quite simple, mainly caused by friction. Electromagnetic noise is mainly caused by electromagnetic vibration. The magnetic field in the air gap of the motor generates electromagnetic force, which generates radial force on the stator and rotor, thereby causing vibration and noise. 1. The brushless motor has internal problems, causing the stator coil to shift or partially damage, resulting in increased noise. 2. There is a problem with the commutation, and the electrical and mechanical angles are not synchronized, resulting in a slightly long delay. This causes certain fluctuations in the internal current of the brushless motor, resulting in noise. 3. The issue of commutation angle, if not correct, can also generate some noise, so it is necessary to carefully check the commutation program of the brushless motor. Brushless motors generate noise, indicating that the motor has more or less certain problems. It is necessary to promptly identify the source and cause of the noise, quickly solve the problem, and ensure the normal operation of the motor.
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