What is brushless DC motor pre drive

Brushless DC motor.

The general drive mode has a square wave.

There are two kinds of drive and sine wave drive, and the distinction is not very clear for this point, and some people define the motor driven by sine wave as a permanent magnet synchronous motor.

There are also those that call both brushless DC motors.

The principle of brushless DC motors is the same for the rest of the brushed DC motors, except that the mechanical commutation is changed to electronic commutation.

The difference between the positionless brushless DC motor and the positional brushless DC motor is that it has a non-inductive position sensor, and the commonly used sensor has a Hall element or IC, which is used to induce the change of the NS pole to confirm the position of the rotor, and through the rotor position of the sensor induction, the stator input current is commutated, so as to achieve the purpose of continuous rotation of the motor and correct commutation.

Positionless brushless DC motors also need to sense the rotor position, but the way to sense the rotor position is not through the component, but generally by monitoring the back EMF.

The waveform confirms the rotor position and thus commutation.

The driving principle is the same, and the specific circuit design can be found in some typical design cases to see.

It consists of motor body + driver.

The design of the brushless motor driver needs to have a pre-drive function, and the pre-drive driver chip amplifies the input weak current signal into a strong enough strong current signal suitable for external equipment to drive the power tube to work normally. At present, the following two drive circuits are commonly used, pre-drive chip + MOS, 2MCU+MOS with pre-drive;

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DC motors refer to motors with brushes. The brushless DC motor is the same as the AC servo, which belongs to the synchronous motor, and the name is DC, which does not actually belong to the DC category.

In the same way, the DC servo corresponds to the DC servo motor. The brushless servo corresponds to the DC brushless servo motor, while the AC servo corresponds to the AC servo motor. Brushless servo and AC servo Zenxiang are one category, and DC servo is another.

Differences:1Brushless means that there are no brushes, and brushes are a wearing part for DC motor starting. Brushless is to use a drive circuit instead of a brush to start the motor;

2.DC motor refers to the use of DC power supply, because the magnetic field generated by DC is constant, the start needs a brush or a circuit that replaces the brush;

3.Servo motor, also known as actuator motor, is used as an actuator in an automatic control system to convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. It is divided into two categories: DC and AC servo motors, and its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the speed decreases uniformly with the increase of torque.

Hello, thank you for your trust and patience Brushless DC motor (BLDC motor) is a new type of high-efficiency motor, and its drive is also different from ordinary DC motor. Compared with traditional DC motors, brushless DC motors are not only more efficient, but also have a longer service life, less noise, and easier maintenance. Its driving principle can be divided into the following three steps:

1.Port assignment for brushless DC motors first. Brushless DC motors have three outlet ports, called U, V, and W, which are usually connected to a PWM (Stihl MoortoN) governor in the form of a star or triangle.

2.Power device control. In power devices, 6 MOSFETs are usually used to control brushless DC motors.

These power devices are switched on and off in turn at different stages of motor operation to make the motor run stably and efficiently. 3.Positioning control of brushless DC motors.

When the motor needs to be reversed or speed regulated, the PWM controller will send a signal from the low-level port of the governor according to the speed regulation signal, which will control the positioning sensor to work and accurately position it through the PWM controller. The purpose of positioning control is to achieve accurate control of motor operation, reduce noise code, and prolong the life of the motor. The above is the driving principle of the brushless DC motor, which can achieve extremely precise control of the motor operation through the fine control of the power device and the positioning controller.

The brushless straight open shed current motor has good external characteristics and can output large torque at low speed, so that it can provide large starting torque; The brushless DC motor has a wide speed range, and can operate at full power at any speed; The brushless DC motor has high efficiency and strong overload capacity, which makes it have excellent performance in the drag system; The regenerative braking effect of the brushless DC motor is good, because its rotor is a permanent magnet material, the motor can enter the generator state when braking; The brushless DC motor is small in size and has high power density;The brushless DC motor has no mechanical commutator and is fully enclosed in structure, which can prevent dust from entering the inside of the motor and has high reliabilityBrushless DC motors are simpler to drive and control than asynchronous motors.

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A low-power DC motor that is electronically commutated. It is also known as a non-commutator motor and a commutator-free DC motor. It is to replace the mechanical commutator in the general DC motor with a semiconductor inverter, and form a DC motor without a commutator.

This kind of motor has simple structure, reliable operation, no sparks, low electromagnetic noise, and is widely used in modern production equipment, instrumentation, computer peripherals and advanced household appliances.

The brushless DC motor is composed of a synchronous motor and a drive, which is a typical mechatronics product. The stator windings of synchronous motors are mostly made into three-phase symmetrical star connections, which are very similar to three-phase asynchronous motors. The rotor is glued with magnetized permanent magnets, and a position sensor is installed in the motor to detect the polarity of the rotor cluster of the motor.

The driver is composed of power electronic devices and integrated circuits, and its function is: to accept the start, stop and braking signals of the motor to control the start, stop and infiltration of the motorAccept the position sensor signal and forward and reverse signal, which is used to control the on-off of each power branch of the inverter bridge to generate continuous torqueAccepts speed command and speed feedback signal to control and adjust the speedProvide protection and display and much more.

The brushless DC motor consists of a self-controlled inverter controlled by a position detector. The inverter of small and medium-sized thyristor motors is generally composed of transistors;The inverter of a large motor is usually constructed of a thyristor, called a thyristor motor.

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