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FAQ
As we all know, the motor is used for a long time, more or less will produce heat, will heat, DC brushless motor is also so, some belong to the normal heat, some belong to the abnormal heat, if the temperature is too high, hot, it may be anomalous phenomenon, then the DC brushless motor temperature is too high, what is the main reason for it? How to solve the problem in time.
Reason for high temperature of DC brushless motor: 1. The input voltage of the brushless motor is too high, far exceeding the allowable rated voltage, causing an increase in internal iron loss of the motor, generating a large amount of heat, and causing high temperature of the motor. 2. Brushless motors have a rated load. If they operate at an overload, the machinery will experience abnormalities, generate high temperatures, and cause the temperature rise of the motor to increase. 3. It is possible that the insulation layer of the brushless motor winding coil is damaged and damp, leading to local short circuits and temperature rise. 4. Brushless motor bearings show wear and tear, causing a high temperature rise due to cleaning the bore. 5. The unstable voltage of the three-phase power supply causes instability in the current, leading to a higher temperature rise of the motor. 6. It is possible that the motor starts frequently, causing the temperature to increase during a certain period of time. Solution to high temperature of DC brushless motor: 1. Match the corresponding power voltage and adjust it to the normal voltage range. 2. Do not operate under load. If necessary, replace with a suitable brushless motor. 3. Check the coils and bearings, and do not frequently start the brushless motor. The above are the reasons and solutions for the high temperature of DC brushless motors. In fact, no matter what type of motor it is, it is necessary to do a good job in heat dissipation. If there is a temperature rise, it should be dealt with in a timely manner, so that the motor can operate normally and achieve twice the result with half the effort.
DC brushless motor after a long time of operation, it is possible to shift the direction, some changes occur, so what affects the motor commutation? What are the main factors?
There are three common factors that affect the direction change of DC brushless motor, including electromagnetic factors, mechanical factors and electrochemical factors.
1. Electromagnetic factors
When the DC brushless motor is commutated, there will be reactive potential and commutation potential in the commutation element, and the sum of these potentials is generally greater than zero, which is called delayed commutation. In the commutation process, when a commutator is separated by the rear brush along and transferred to another neighboring commutator, the commutation current is not zero and the electromagnetic energy is stored in the commutation element. When the motor brush and the previous commutator is detached, the commutation circuit is suddenly blocked, and the electromagnetic energy in the commutation element is released as soon as it breaks through the air, producing sparks.
2. Mechanical factors
As far as production is concerned, it is an important aspect to reduce the bad judgment caused by the DC brushless motor's own factors. There are many mechanical factors, such as the flatness and roughness of the exterior of the three-dimensional commutator, and the perpendicularity of the exterior of the commutator and the motor shaft during disassembly. Dented insulation between commutator blades or dented commutator blades. Poor grounding of the brush contact surface, with the brushes only partially contacting the commutator surface. Different spring pressure on brushes. Brushes in brush box too loose or too tight. The distance between each brush bar is not equal, so that some commutator elements of the short-circuiting brushes are not on geometrically localized lines.
3. Electrochemical factors
During normal operation, a brown film of cuprous oxide appears on the surface of the commutator of a DC brushless motor. Theory shows that the existence of copper oxide film is a necessary prerequisite for good motor commutation, because the copper oxide film itself is not only high resistance, but also adsorbed on the surface of a thin layer of moisture, oxygen and graphite powder, has a good smoothing effect, is conducive to increasing the wear and tear of brushes and commutator.
The above is the influence of DC brushless motor commutation several factors, master these basic knowledge, in order to better understand the DC brushless motor.
Now the net red blow dryer more and more, more and more intelligent, relative to the old blow dryer, the experience is better, many friends do not understand its working principle, also do not know what motor used, the following He Hui simple to introduce it to you! I hope to help you!
Nowadays, most hair dryers use high-speed DC brushless motors, which work by utilizing the interaction between the electric fan and the heating coil to convert electrical energy into convective heat energy. After the fan rotates continuously, the generated airflow flows to the hair dryer through the heating element. When the airflow passes through the heating coil, due to forced convection, the heat from the coil heats the airflow, and hot air flows out from the end of the hair dryer. The role of high-speed brushless DC motor in hair dryers: 1. Safety protection system. In order to prevent overheating and ignition, high-speed brushless DC motors have overheating protection devices. When the temperature and current are high, the fuse melts and the power supply is cut off, which will automatically provide protection. 2. The high-speed brushless DC motor has a leakage protector for real-time monitoring. If there is leakage, the circuit will be automatically cut off. 3. The shell of the hair dryer is insulated with PP and ABS plastic materials, with good insulation function; The high-speed brushless DC motor operates stably and reduces heat generation. 4. The decibel of the high-speed hair dryer is as low as 45dB, and the fan noise is as low as 40dB, reducing noise pollution and reducing ear damage. Why does the high-speed hair dryer use a brushless DC motor? The above simple explanation of the working principle and function, I hope it can help everyone!
Water pumps are divided into a variety of small pumps, fish tanks, water purifiers, cars, industrial pumps, etc., can be commonly divided into water pumps DC motors and pumps AC motors, many friends do not know very well, often easy to get it wrong, the following Hohui from a variety of aspects of the difference between the two it! I hope to help you solve the mystery.
1. Different input power sources: The DC motor of the water pump inputs DC power, while the AC motor of the water pump inputs AC power, which is divided into single-phase and three-phase. 2. Different working principles: AC motors use alternating current as the power supply voltage, which enters the stator winding and generates a rotating magnetic field in the air gap between the stator and rotor. This generates induced current in the rotor winding, causing the rotor to operate under force in the stator magnetic field; The power supply voltage of a DC motor is a DC input, commonly used technology for control. It can perform stepless speed regulation, with adjustable levels and feedback signals. It can also achieve closed-loop speed regulation and fast braking, resulting in relatively better output stability. 3. Different motor structures: DC motors have simple principles but complex structures; The principle of AC motors is relatively complex and the structure is relatively simple. 4. Different uses: The DC motor of the water pump has a wide range of speed regulation, while the AC motor of the water pump has a relatively small range of speed regulation. 5. Different output powers: Relatively speaking, the power of the water pump DC motor is smaller than that of the AC motor, especially the brushless motor, which can solve many shortcomings of the brushless motor. 6. Commutator: Usually, a DC motor with a commutator and an AC motor without a commutator. What are the differences and differences between water pump DC motors and AC motors? The above has been briefly explained, hoping to help everyone!
With the rapid development of the motor industry, the use of DC brushless motors is becoming more and more widespread, and is now often used in home appliances, new energy vehicles, power tools, office equipment, industrial and commercial equipment, medical equipment, personal care, robotics and many other industries, favored by the majority of customers.
Many friends who are studying brushless motors often ask a question, which is how to wire a DC brushless motor. They have not been able to understand it, so let's briefly introduce it to everyone! I hope everyone can further understand the wiring methods of brushless motors. The stator windings of brushless DC motors are mostly made into three-phase symmetrical star connections, similar to three-phase asynchronous motors. Magnetized permanent magnets are connected to the rotor of the motor. In order to detect the polarity of the motor rotor, a position sensor is installed in the motor. The driver is composed of power electronic devices and integrated circuits, and its function is to receive the start, stop, and brake signals of the motor, and control the start, stop, and brake of the motor; Accepting position sensor signals and positive and negative rotation signals to control reversal, changing the on-off of each power tube in the bridge, and generating continuous torque; Receive speed commands and feedback signals to control and adjust speed, provide protection and display, etc. The brushless motor has 3 coil leads and 5 Hall leads, and these 8 wires must correspond to the corresponding wires of the controller one by one, otherwise the motor cannot rotate normally. Generally speaking, brushless motors with 60 degree and 120 degree phase angles require corresponding brushless controllers with 60 degree and 120 degree phase angles to drive. The controllers with two phase angles cannot be directly interchanged. The 8 wires connecting the brushless motor with a 60 degree phase angle to the controller with a 60 degree phase angle have two correct connections, one for forward rotation and the other for reverse rotation. There are 36 ways to connect 3 thinner Hall phase wires and 3 thicker motor winding phase wires to the controller. When replacing the wire, it can be powered on, but be careful and orderly. The rotation angle of the speed control handle should not be too large to avoid damaging the controller. The above are common wiring methods for brushless DC motors. I hope these basic knowledge can help everyone! Have a better understanding of the structure of brushless motors.
With a variety of drones, robots applications are becoming more and more common, brushless motors should be more and more extensive, there are small size, light weight, fast speed and other characteristics, more suitable for drones, so why brushless motors are more suitable for drones? Is brush motor not good? The following Hohui briefly introduce it to you!
Why do drones choose brushless motors? Is there any problem with brushing? 1. Reliability, most DJI drones have chosen brushless motors. More than 90% of the drawbacks of a brush motor are due to carbon brushes, which are determined by its design itself. Conditions such as dust ingress, rust, and vibration can all lead to poor contact and further problems. 2. With a long lifespan, the carbon brushes of the brushless motor will wear out, and regular updates are needed. Regarding the civilian product industry, this is clearly not in line with theory; Brushless motors are intact without any concerns in this regard and are almost maintenance free. 3. High efficiency refers to the conversion rate of energy. Brushless motors do not have contact resistors or heating elements such as carbon brushes, resulting in a high application rate of electrical energy, which can reach up to 90%; Brushed motors can only reach 75%, so brushless motors have a significant advantage in operating time. 4. Heat dissipation: Due to a large portion of electrical energy being converted into thermal energy, a corresponding heat dissipation design is necessary for a brush motor. This will affect the volume of the product and increase its weight, which is not feasible for drones or robots. 5. Control accuracy: According to the ordinary concept, the control accuracy of a brushless DC motor is high. But we need to approach things dynamically and dialectically. With the advancement of Hall sensors, when paired with brushless motors, accuracy issues can be solved. Why is brushless motor more suitable for drones? After reading the above, I believe everyone has a preliminary understanding. After comprehensive analysis, brushless motor solves the shortcomings of brushless motor and is more stable and safe for drones!
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