Category: bldc motor

bldc motor: how does it work in a ceiling fan

bldc motor is used in ceiling fans. A month after Panasonic launched a 7-watt emergency LED lamp, Anchor launched a series of smart fans using a new bldc motor to minimize power consumption in Indian homes and business offices.
The new bldc motor fan adopts the first-class technology of Japan and is produced in the most advanced factory in India.
The ceiling fan is assembled by bldc motor. This helps the fan to work without slippage loss and reduces power consumption by 60%. Therefore, it can maintain a constant speed (RPM) of up to 140 V even in the case of voltage fluctuation.
The new BLDC fans are certified by the U.S. Energy Efficiency Agency (EEA) as 5-star, so they consume less power without affecting air transmission.
The new anchor fan consumes only 30W of power and can provide 230 cubic millimeters (cubic meters) of air transport even at the highest speed.
The fan has a convenient remote control operation and a special sleep mode. It can switch to automatic shutdown function of 2 hours, 4 hours or 8 hours.
This series of indoor air quality fans are temperature sensitive and help to provide cool air and create a natural, comfortable and relaxed environment.
The new generation of bldc motor ceiling fan not only saves power, but also provides a variety of colors – White / silver, marble / gold and walnut / gold.

bldc motor: why is it widely used

bldc motor has many advantages over other types of DC motors. They are high-speed operation, compact power level, almost no electromagnetic interference. However, the complexity and cost of driving circuits limit their applications.
The good news is that recently the development of semiconductor drive circuits has made bldc motors more popular. In fact, these new drive circuits may affect you, making bldc motor your first choice for new electric household appliances and industrial products.
bldc motor is different from ordinary DC motor, and has strong permanent magnet rotor and fixed stator winding. Windings are usually connected in three-phase structure, requiring three different driving signals to three sets of windings. The driving signal is applied by the controller to create a rotating magnetic field, which interacts with the magnetic poles on the rotor to produce a smooth and continuous rotation.
Bldc motors are sometimes referred to as electronic commutating motors. Although they are designated as DC motors, driving signals are a form of communication. At any time, one pulse is positive, one pulse is negative, and the third pulse is open (O) or floating. This series of pulses makes the rotor stable.
The general advantages of bldc motor include: standard DC motor does not use mechanical commutator and brush. Brush wear and shorten service life. In addition, the brush commutator switch combination produces arcs, which in turn can cause electrical noise. Bldc motor eliminates these problems. It is more reliable, efficient, and produces less electromagnetic interference, and bldc motor provides more torque and power than other DC motors.

bldc motor: how to convert it to encoder

bldc motor can be converted into a rotary encoder if you have some magnets and a bunch of coils arranged in a circle. Many people use bldc motors as rotary encoders, but they seem to use motors as generators and observe the phases and voltages. In their Hackaday Prize project, they took a different approach: they used bldc motor as coupling inductor, which seemed to be a viable way to convert motors into encoders.
At present, the project aims to send instructions to the microcontroller through serial port and rotate the bldc motor to a specific location. Future work will turn these bldc motors into tactile feedback controllers.
The experimental device of this project is a blue pill microcontroller based on STM32F103. This, combined with a set of half-bridges for driving bldc motor, is really the only thing that requires rotating motors and detecting where the motors are. The circuit uses 6 digital outputs to drive the high side and low side of the half bridge, and 3 analog inputs are used as feedback. The resulting waveforms look like three strange staircases, out of sync with each other, and the correct processing is enough to detect the position of the bldc motor.

bldc motor: what is trapezoidal control of it

bldc motor is controlled by a variety of different control algorithms. Usually, the voltage of an electric motor is controlled by a power transistor as a linear voltage regulator. This is not realistic when driving high power motors. High power motors must be controlled by PWM, and the microcontroller needs to start and control functions.
Control algorithms must provide three things:
PWM voltage controlled motor speed
Mechanism of commutating motor
Methods using backward EMF or Holzer sensor to estimate rotor position.
Pulse width modulation is used to apply variable voltage to motor windings. The effective voltage is proportional to the duty cycle of PWM. When the commutation is suitable, the torque speed characteristic of bldc motor is the same as that of DC motor. Variable voltage can be used to control motor speed and available torque.
Trapezoidal commutation of bldc motor
One of the simplest control methods of DC brushless motors is the so-called trapezoidal commutation.
In this scheme, the current is controlled one-to-one at a time through the motor terminal, and the third motor terminal is always disconnected from the power supply.
The commutation of the power transistor provides energy for the appropriate windings in the stator to provide the optimal torque generation according to the rotor position. In bldc motor, the single chip microcomputer must know the rotor position and commutate at the appropriate time.

bldc motor: more efficient than brushed dc motor

bldc motor needs more complex control design and drive circuit. In place of the bldc motor single door driver and power field effect transistor, each phase of the bldc motor needs to take out 6 memory, each memory is composed of three half bridge pairs.

The designers of power tools are constantly taking on the task of cramming more electronics into the same or smaller space. The first is to switch off the wires by switching to battery powered equipment. Due to the need to save battery power, there are more complex control schemes, sensors and power drive devices, from brush DC motor to a more efficient bldc motor.

Wireless and BLDC blocks require very different feature sets. Control bldc motor calls high resolution pulse width modulation (PWM) timer, multi-channel analog-to-digital converter (ADC) with necessary conversion speed, general input/output (GPIOs) interrupt capability, and wired connection options. Wireless MCU needs to have RF front-end, high-frequency reference clock, digital phase-locked loop (PLL) and DSP modem and other functions.

Dividing wireless and BLDC functions into separate MCUs is a tested option, but it’s better to combine the two blocks into a single MCU. It creates a more compact solution while reducing power consumption and BOM costs. Of course, the selected microchip must contain the required peripheral blocks, processing power, and memory required to perform bldc motor and wireless functions.

bldc motor: how does it come out?

bldc motor is produced in accordance with the times. For the electronics design industry, this is an exciting time as embedded electronic functions have penetrated into every aspect of modern society. With the subversive growth of the Internet of Things (IoT) and new intelligent manufacturing (also known as Industry 4.0) requires designers to develop powerful, compact, accurate and efficient motion-driven solutions.
It’s been more than a century since electric motors existed, but the initial design was inefficient, bulky and inaccurate. The emergence of rare earth magnets and the design of advanced bldc motor have given rise to a new series of motors that are small enough to be installed in confined spaces, powerful enough to do practical work. What’s more, bldc motor is efficient enough to be used in wireless applications or remote applications.
With the pressure of creating products that are both functional and cost-effective, electronics engineers must get the best performance from every system they design.
High-performance bldc motors deliver the performance and economics required in today’s demanding applications. This includes applications ranging from smart home appliances to automated propulsion of IoT equipment, from industrial workshops to “downhole” drilling and mining operations, bldc motor is widely used in different industries.

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