hub motor controller electronic reversing device, instead of the traditional mechanical commutation device (commutator and brush), not only retained the DC motor speed control with good starting characteristics, and AC motor with simple structure and easy maintenance This motor in good, reliable, therefore, the rapid development in recent years. Traditional DC motor armature is rotated, the pole is stationary, but bldc motor driver in this contrast, the magnetic pole is rotated, the armature is stationary, the armature winding current commutation can make use of position sensors and electronic switching circuit to complete. Brushless motor. hub motor driver generally motors, position sensors, and electronic switch consists of three parts. Motor itself consists of multi-phase (three phase, four-phase, five-phase range) armature windings on the stator pole and a certain number of permanent magnet rotor component. AA, BB, CC, said three-phase motor stator windings, NS is a permanent magnet, the motor rotor, PS is the rotor position sensor, and its coaxial rotor and motor rotor is connected, BG1, BG2, BG3 electronic switching circuits power switch, three-phase windings A, B, C respectively, BG1, BG2, BG3 in series to the power supply after. Its operation principle is that a signal controlled by the PS BG1, BG2, BG3 and other switch on on and off, when the switch turns on, the corresponding stator windings, there is current and magnetic field through the magnetic field and permanent magnetic interaction between the rotor pole will generate torque, the motor rotor, the motor coaxial with the rotor position sensor is connected, it also followed the rotation of the rotor and in turn to BG1, BG2, BG3 signal to control the turn on and off, to the armature winding current with the rotor position changes according to the order of commutation, the magnetic armature rotary stepper motor’s rotor to rotate continuously go on.
Tag Archives: bldc motor controller
bldc motor interaction principle
Based on the principle of rotation of the motor for the Fleming left hand rule, when a wire placed in a magnetic field, if the current through the wire, the wire will cut the wires generate the magnetic field lines move. Current into the coil creates a magnetic field using the current magnetic effect, the solenoid magnet at a fixed continuously rotating device that can convert electrical energy into mechanical energy. And a permanent magnet or by another group of the magnetic field generated by the coil to generate power bldc motor interaction principle is the stator does not move, the force generated by interaction of the rotor according to the direction of movement. bldc motor controller is on the alternating current through the stator windings, a rotating magnetic field, rotating magnetic field attracts the rotor rotates bldc motor with the basic structure include “armature”, “field magnet,” “slip ring”, “brush” . Armature: You can rotate around the axis of the soft iron core wound multi-turn coil. Field magnet: the strong magnetic field of permanent magnet or an electromagnet. Collector ring: coil about two to two semi-circular termination of slip ring, with the coil rotation for changing the current direction of the change to the device. Each half-circle rotation (180 degrees), the coil current to change direction once. Brushes: carbon usually made of slip ring brush contact with a fixed location to be connected to power.
BLDC motor controller basic principles
bldc motor controller is the leading voltage AC motor running, widely used in electric fans, refrigerators, washing machines, air conditioners, hair dryer, vacuum cleaner, range hood, dishwasher, electric sewing machines (to be found food processing machines and other household appliances and various electric tools, small electromechanical devices.
bldc motor driver is divided into induction motors and AC commutator motor. Divided into single-phase induction motor asynchronous motor, AC and DC motors and repulsion motor.
bldc motor driver basic principles:
(1) When access to three-phase AC induction motor three-phase power, three-phase stator windings generate current flow through the three-phase symmetrical three-phase magnetomotive force (the stator rotating magnetic momentum) and produce a rotating magnetic field.
(2) The conductor of the rotating magnetic field and the rotor has a relatively cutting exercise, according to the principle of electromagnetic induction, EMF and rotor conductors induced current.
(3) According to the law of the electromagnetic force, the current-carrying conductor in a magnetic field in the rotor by the electromagnetic force, the formation of the electromagnetic torque, driving the rotor rotation when the motor shaft with a mechanical load, then out the output mechanical energy.
BLDC motor control technology
In 2005, BLDC motor controller was developed, improved and upgraded to address the existing weaknesses in several electric vehicles, vehicle design to meet the consumers and the increasing demand for vehicle performance. It avoids the same maximum rated power output of a long, sustained the same frequency to reduce the impact of the motor, motor coordination and other systems, electric cars and stable work, greatly extending the life of electric vehicles.
Equipped with a BLDC motor controller for electric vehicles in the cycling process, the inverter controller and inverter composed of high-efficiency motor power system, take advantage of low current, high-torque theory, in the process of riding in a timely manner according to traffic and load to adjust the output power .
This technology works, the electric car start, climbing, a small motor current, torque, and increases the climbing ability and more power; and on a level road, the standard load driving the motor to a small current, high efficiency work, so fast, low power consumption, extend the continued line mileage.
Install the BLDC motor system of the electric car as long as a power supply and speed, the car was immediately driven, and demonstrated a remarkable strong force, and unlike most of the electric car start when they “struggle” was a difficult time crawling This is the BLDC motor technology advantage.
In July 2005, the Group introduced three BLDC motor MACAT electric cars, are very popular. Taiwan Tianjin growth of electric cars with electronic features brushless motor control system — electronic CVT systems, but also uses the same technology. This new motor system increases the motor torque constant, reducing the overload point, the motor phase current context, to effectively improve the speed of the motor rated load point.
2007 by Locomotive Co., Ltd. Qing long developed similar to the motorcycle gear with three power electric cars is based on such frequency control technology.
This technology effectively improve the electric vehicle drive system features a certain extent, solve the electric vehicle the problem of poor climbing ability, and easy manipulation of the user, complete electric car downshift speed and overall performance has made great breakthroughs .
BLDC motor vehicle idling is a component
BLDC motor vehicle idling is a component. Referred to as idle the engine idling. Its role is: idle, according to the level of the engine temperature and load size, change the idle air channel cross-sectional area of the engine under different conditions have the best idle speed.
BLDC motor controller is mainly used to bear the car idle, and its purpose is to be used according to the idle time to adjust the idle speed of engine load. Idle stepper motor mounted on the throttle body from the engine controller to control engine idle speed, engine speed deviation from the idle, the valve regulating flow from section to control the intake manifold into the air by the mechanical operation of the accelerator pedal steel wire rope . Throttle body with a bypass air channel, to provide air in the engine idling (when the throttle is closed). BLDC motor automatically pivot into his bypass air tract, which regulate air flow through the engine controller according to a variety of sensor inputs, the use of mobile automated BLDC motor controller for pivot out of the bypass air channel adjust engine idle speed. When the ignition key to open position, automatically BLDC motor to work. The switch signal input ECU, the engine is in idle perception condition. At the same time, real-time position in which the motor from the motor position sensor feedback to the ECU.
BLDC motor controller
BLDC motor is a rotary machine, BLDC motor controller ,It will transform electrical energy into mechanical energy, which includes a solenoid winding to generate magnetic fields, or distribution of the stator windings and a rotating armature or rotor, a current through the wire and leaving the rotation by the magnetic field, these machines Some types can be used for BLDC motor can also be used for generators. It is the electrical energy into mechanical energy of a machine. The BLDC motor is usually part of a rotary motion for power, this BLDC motor as the rotor BLDC motor; there in a straight line, called linear BLDC motor. BLDC motor can provide power range widely, from milliwatts to a million kilowatts. BLDC motor is very easy to use and control, self-starting, acceleration, braking, reversing, valves and shelter capacity, to meet various operational requirements; BLDC motor’s high efficiency, no smoke, odor, do not pollute the environment , the noise is also smaller. Because it’s a series of advantages, so in industrial and agricultural production, transportation, defense, commercial and household appliances, medical electrical equipment and other aspects of wider applicat
AC induction BLDC motor
Today’s domestic industrial control industry, for motors usually have such a view: low-end motor using AC induction BLDC motor, high-end motor servo motor. In fact there is a domestic motor applications skip the phenomenon, from the AC induction motor to jump directly to the BLDC motor controller, and the middle of the brushless DC motor is often ignored by people. Brushless DC motor as a DC brush motor characteristics, but also the frequency of the device, they are called the DC inverter, the international generic term for the BLDC. Unique brushless DC motor of high efficiency, low fever and other features and advantages, are in line with the national energy saving requirements. By comparison with some other motor, we can see these features more intuitive, and thus facilitate the selection of the motor when engineers select the most suitable motor, not the most expensive motor.
Brushless DC motor is also called BLDC motor
No commutator motor (roasted Yuushidendouki choking, Brushless Direct Current Motor) is a DC motor with the same structure as the permanent magnet synchronous motor drive built-in power supply control circuit instead of the commutator . Brushless DC motor, brushless DC motors, also called BLDC motor. Brush DC motor with high efficiency, have been widely used because it is relatively inexpensive, can be miniaturized, have life by the brush wear due to the sliding contact. Therefore, the larger motors are required to maintain replacement brush, small brush if you can not be replaced, and the life of the motor brush life. No commutator motor is replaced by the role of electronic brush (brushless DC motor) is.
BLDC motor controller Advantages
there is no commutator brushes, no need to maintain its long life.
There is no electrical brush noise.
There is no external contamination of the powder brush wear.
High-speed operation is possible because there is no contact parts.
Cons
for electronic circuitry, Environmental resistance and ambient temperature will depend on electronic components.
Expensive compared to brushed DC motor. If the current is high, especially for switching semiconductor devices are expensive
How to Select bldc motor and stepper motor
How to Select bldc motor and stepper motor?
Mainly depending on the specific application of the case may be, simply to determine: the nature of the load (such as horizontal or vertical load, etc.), torque, inertia, speed, accuracy, acceleration and deceleration, etc., the upper control requirements (such as port interface and communication requirements), is the main control position, torque or speed mode. Power supply is DC or AC power or battery power supply, voltage range. Accordingly, to determine the motor and equipped with the drive or controller models.
Choose the stepper motor or bldc motor controller?
In fact, the choice of what kind of motor should be based on the specific application, depending on their own characteristics. Please see table below, naturally understand.
Stepper motor system bldc motor system
Small and medium-range torque torque (20Nm usually less) small medium large, full range
Low speed range (usually in the following 2000RPM, high torque motor is less than 1000RPM) high (up to 5000RPM), DC bldc motor can even reach 1 to 2 million r / min
Main control position control diverse intelligent control, position / speed / torque mode
Vibration at low speed smoothness (but with a sub-type of drive can be improved) is good, runs smooth
Accuracy is generally low, higher high when the sub-type drive (depends on the specific feedback device resolution)
Torque-frequency characteristics of high speed, good torque down fast torque characteristics, features hard
Overload overload feature will be out of step 3 to 10 times overload (short)
The majority of open-loop feedback control mode, the encoder can also be connected to prevent the loss of step closed loop encoder feedback
Encoder Type – Optical Rotary Encoder (Incremental / Absolute), resolver-based
Response speed is generally fast
How equipped with bldc motor controller?
How equipped with bldc motor controller?
According to the motor current, with the greater than or equal to the current drive. If you need a low vibration or high accuracy, can be equipped with a sub-type drive. For high torque motor, as with high voltage drive to get good high speed performance.
2 phase and 5 phase bldc motor What’s the difference, how to choose?
2-phase motor and low cost, but the larger the vibration at low speeds, the torque at high speed down quickly. 5-phase vibration motor is smaller, high-speed performance, compared with 2-phase motors, high-speed 30 to 50%, in some cases replace bldc motor.
When to select a DC servo system, servo it What’s the difference?
Bldc motor into a DC brush and brushless motors.
Brush motor, low cost, simple structure, starting torque, wide speed range, easy control, the need to maintain, but easy to maintain (for brushes), generate electromagnetic interference, the environment requirements. Therefore, it can be used for cost-sensitive general industrial and civil applications.
Brushless motor, small size, light weight, large output, fast response, high-speed, inertia is small, smooth rotation, torque and stability. Control complex, easy to implement intelligent, flexible way to their electronic commutation, the commutation can be square wave or sine wave commutation. Motor maintenance-free, high efficiency, low operating temperature, electromagnetic radiation is very small, long-life, can be used in various environments.
AC bldc motor is brushless motor, is divided into synchronous and asynchronous motors, motion control in general are currently with the synchronous motor, its power range, can do a lot of power. Large inertia, the maximum rotation speed is low, and with the power increases rapidly reduced. Therefore suitable for low speed applications running smoothly.
The motor should pay attention to the problem?
The power to run before you make the following checks:
1) the appropriateness of the supply voltage (overvoltage is likely to cause damage to the driver module); for the DC input of + / – polarity must not be wrong, the motor drive controller on the model or the current setting is appropriate (do not start too);
2) control signal line connected, secure, industrial site is best to consider shielding (such as the use of twisted-pair);
3) Do not put the need to take the start line all connected, only the most basic system even as, well, then gradually connection.
4) The grounding method must be clear, or the use of float is not connected.
5) began running half an hour to closely observe the motor state, such as the movement is normal, sound and temperature, and found the problem immediately stop adjustment.