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If you are looking for a motor with a long service life, consider using a brushless motor. The life of a brushed motor is limited by the type of brush, which can reach 1,000 to 3,000 hours on average, while the average life of a brushless motor can reach tens of thousands of hours, because there is no brush to wear.
There is no such thing as a brushless direct current (BLDC) motor. Rotating electric machines generate torque in one of two ways-magnetic field alignment and reluctance (convexity). In either case, a rotating magnetic field is required. In a brushless motor, this is generated by the alternating current in the stator. Therefore, any brushless motor is actually an AC motor... there is actually no brushless DC motor!
The term BLDC motor is derived from the fact that when the electronic controller drives (commutation) the motor, when viewed from the controller's DC terminal, the system behaves like a traditional brushed DC motor-the speed is proportional to the applied DC voltage Change proportionally. Essentially, the mechanical commutator (the part that uses the brush) is replaced by an electronic controller with a power transistor. There are many ways to modulate these transistors, the most common and simplest method is called "trapezoidal drive" (also the lowest performance, but this is the subject of another blog). However, in all cases, the current generated by the controller and flowing through the BLDC motor stator windings is alternating current, not direct current.
(2) The advantages of brushless motor
Compared with traditional brushed motors, brushless motors have huge advantages-it is obvious that there are no brushes that will wear out-and the speed, efficiency, weight, size and reliability have been greatly improved. The growth in the application and popularity of brushless motors has kept pace with the tremendous advances in power electronics and control technology, which is the production of "electronic commutators" (usually referred to interchangeably as: drive, controller, electronic speed controller, inverter Device, etc.).
As the world's electrification, power electronics technology, control technology and energy storage technology continue to develop, brushless motors will undoubtedly play a greater role. With the improvement of energy storage technology (especially lithium-ion batteries) and the reduction of prices, the competition between electric and hybrid electric vehicles and traditional gasoline-powered vehicles has become increasingly fierce. Electric vehicles not only use brushless motors as the main traction drive, but also use auxiliary systems, such as pumps for power steering and compressors for air conditioning, which were previously driven by engine belts. Even airplanes, such as the Boeing 787 Dreamliner, have flight-by-wire systems and electric actuators that have replaced traditional hydraulic systems and other mechanical systems, and are now becoming more and more electrified. Eventually, when the energy density of the battery is good enough, the electric propulsion may even become a practical power for the aircraft-in fact, this is already happening in the small unmanned aerial system (UAS).
(3) Should I choose a brushless motor?
In short, brushless motors are better than brushed units. Users can take advantage of reduced maintenance, improved efficiency, and reduced heat and noise. Brushless motors are synchronous units with one or more permanent magnets. Power tools with brushless motors are now considered high-end products.
The DC motor consists of two electrical parts: the stator and the rotor. When power is supplied to the motor, electromagnetic interaction will occur to make the motor move. When you reverse the direction of the voltage supplying the motor, it will rotate in the opposite direction.
Cross flow fan consists of motor, impeller(wheel) and housing. The impeller is produced a whole by the plastic injection or the aluminum alloy pressure casting, including multi-leaf, long cylindrical with forward multi-wing blades.
Its operating principle as follows:
When the impeller rotates, the airflow enters the cascade from the open end of the impeller, passing through the interior of the impeller, and is discharged into the volute from the other side of the cascade to form a working airflow. The flow of the airflow in the impeller is complex, while the speed field of the airflow is unsteady. There is a vortex in the impeller, centered near the volute tongue. The existence of the vortex causes a circulating flow at the output end of the impeller. Outside the vortex, the flow line of the airflow in the impeller is arc-shaped. Therefore, the flow velocity at each point on the outer circumference of the impeller is inconsistent. The closer to the vortex core, the greater the velocity, and the closer to the volute, the smaller the velocity. The airflow speed and pressure at the fan outlet are not uniform, so the flow and pressure coefficient of the fan are average. The position of the vortex has a great influence on the performance of the cross-flow fan. The center of the vortex is close to the inner circumference of the impeller and close to the volute tongue. The performance of the fan is good. While the center of the vortex is far away from the vortex, the area of the circulating flow is increased, so efficiency of the fan is reduced.
A servo motor is an engine that controls the operation of a mechanical component in a servo system, and is an auxiliary motor indirect transmission. The servo motor can control the speed and position accuracy very accurately, and can convert the voltage signal into torque and speed to drive the controlled object. The servo motor rotor speed is controlled by the input signal and can be quickly reacted. It is used as an actuator in the automatic control system, and has the characteristics of small electromechanical time constant, high linearity, and starting voltage, which can receive the received electrical signal. Converted to an angular displacement or angular velocity output on the motor shaft. Divided into two major categories of DC and AC servo motor, its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the speed decreases with the increase of torque.
Servo motors are widely used in various control systems to convert the input voltage signal into mechanical output on the motor shaft and drag the controlled components to achieve control purposes.
The servo motor has DC motor and AC motor; the earliest servo motor is a general DC motor. When the control accuracy is not high, the general DC motor is used as the servo motor. The current DC servo motor is structurally a low-power DC motor, and its excitation uses armature control and magnetic field control, but usually uses armature control.
The classification of rotating electric machines, DC servo motors can meet the requirements of the control system in terms of mechanical characteristics. However, due to the existence of commutators, there are many shortcomings: sparks are easily generated between the commutator and the brush, which interferes with the operation of the drive. Can not be used in the case of flammable gas; friction between the brush and the commutator will result in a larger dead zone;
The structure is complicated and maintenance is difficult.
The AC servo motor is essentially a two-phase asynchronous motor. There are three main control methods: amplitude control, phase control and amplitude and phase control.
Generally, the servo motor requires the speed of the motor to be controlled by the applied voltage signal; the speed can be continuously changed as the applied voltage signal changes; the motor is reflected faster, the volume is smaller, and the control power is smaller. Servo motors are mainly used in various motion control systems, especially the servo system.
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Kinesis® K-Cube™ Brushed DC Servo Motor Controller
Feb 03, 2016 · The KDC101 K-Cube Brushed DC Servo Motor Controller is a part of Thorlabs' new and growing Kinesis ® line of high-end, compact motion controllers. Designed to provide easy manual and automatic control of DC Servo motors, this single-channel driver is capable of driving a variety of low-powered DC brushed motors (up to 15 V/2.5 W operation ...
How to Test an Evaporator Fan Motor: 15 Steps (with Pictures)
Sep 15, 2021 · Disconnect the fan motor wiring. In freezers where the fan motor is attached to the panel rather than the back of the freezer, you’ll need to just lay the panel down inside the freezer so you can access the wiring that goes to the fan. If it’s not, you’ll be able to disconnect the wiring after you remove the rear panel entirely.
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