What are the specific parameters of permanent magnet brushless DC motor?

The basic parameters are: rated voltage, rated power, rated torque, load current, load speed, no-load current, no-load speed, maximum working point efficiency and power under rated load, damping coefficient, viscous damping coefficient, power factor, back electromotive force coefficient, structural parameters and including, stator slots, silicon steel sheet thickness, winding mode and so on.

The permanent magnet brushless motor can be regarded as a DC motor that replaces mechanical commutation with an electronic phase-returning device, and the structure of the permanent magnet permanent magnet brushless DC motor is mainly composed of the permanent magnet motor body, the rotor position sensor and the electronic commutation circuit. Whether it is the structure or the control method, the permanent magnet brushless DC motor has many similarities with the traditional DC motor: the stator pole of the brushed DC motor is replaced by a rotor equipped with a permanent magnet; replacing the armature with a stator with multiphase windings; Replace mechanical commutators and brushes with electronic commutators consisting of solid-state inverters and shaft position detectors.

The basic parameters I learned are: rated voltage, rated power, rated torque, load current, load speed, no-load current, no-load speed, maximum working point efficiency and power under rated load, damping coefficient, viscous damping coefficient, power factor, back electromotive force coefficient, structural parameters and including, stator slots, silicon steel sheet thickness, winding method, and so on!

It doesn't have to be too complicated, as long as you know the rated power, the rated voltage, the rated speed, the rated speed and size, you will know whether it is suitable or not.

The main advantages of permanent magnet brushless DC motors compared with ordinary brushless motors:

1. Compared with the traditional motor, any speed point can save electric energy, especially when the speed is low, this advantage of the first key is particularly obvious. Most modern submarines use large-diameter, low-speed, 7-blade, large-side-oblique spiral cavern or pump-jet propeller, which has low speed and high propulsion efficiency. Moreover, submarines mostly maneuver at low-noise speeds underwater, which makes this advantage of permanent magnet motors better reflected and rented.

Second, the size is small, light weight, the structure of the permanent magnet motor is simple, due to the use of high-performance permanent magnet data to provide the magnetic field, so that the air gap magnetic field of the permanent magnet motor is greatly enhanced than the general motor, and the volume of the permanent magnet motor and the general motor are greatly reduced, and the size and shape of the motor are also flexible and diverse.

Third, the failure rate is lower and widely used, due to the use of high-performance rare earth permanent magnet data to provide magnetic field, the failure rate is lower, and the use is more and more widespread.

Fourth, the starting torque is large, because the rotor winding does not work when the permanent magnet motor is operating normally, so the rotor winding can meet the requirements of high starting torque in the design, such as from multiple to double, or even larger.

This kind of motor can replace the original Y, Y2, Y3 and other motors with the same size in use. Reduces the hassle of the replacement process. Compared with ordinary motors, the permanent magnet electric Zen key rolling machine has its own characteristics.

The pole speed is 1400N min multi-revolution, and the permanent magnet synchronous motor speed is 1500N minOther speed motors, roughly like this. High power factor.

When the permanent magnet motor is running normally, the rotor speed is the same as the stator magnetic field speed, there is no current on the rotor squirrel cage, and the induced current on the stator decreases, so the bright hole power factor is high. Through reasonable design, it can be made to work in the hysteresis power factor, unit power factor and leading power factor. Generally, the hysteresis power factor can be reached and exceeded, and a large number of permanent magnet motors can be used to save equipment such as reactive power compensators.

High efficiency, especially high operational efficiency. When the permanent magnet motor is running normally, because there is a permanent magnet on the rotor - NdFeB magnet, the normal operation of the motor can be guaranteed by the magnetic field of the permanent magnet, so the rotor squirrel cage has no current, and there is no winding loss.

DC permanent magnet brushless motor.

There are three characteristics of the Lord's quiet judgment:

1. There is no commutator and brush.

The mechanical contact mechanism composed of the group, so the brushless motor has no reversing sparks, the safety is higher, the life is relatively longer, the operation has been effectively guaranteed, the speed can not be limited by mechanical commutation, and the ultra-high-speed speed operation of tens of thousands to hundreds of thousands of revolutions per minute can be realized, and it has a wider application space in the electronic power industry market.

2. The DC permanent magnet brushless motor maintains the excellent speed regulation characteristics of the DC motor, but due to the permanent magnet brushless DC motor.

No rotor excitation current is required.

Therefore, it has a higher energy conversion efficiency than other types of motors. At the same time, there is no need for a magnetic power supply, which can reduce the power consumption of the power supply and has more important economic value.

3. Due to the omission of the excitation winding, commutator and brush, the speed range of the permanent magnet brushless DC motor is not limited by commutation, and the speed can be very high. In addition, permanent magnet brushless DC motors.

It also has a series of significant advantages such as high efficiency, high torque, high precision and high precision, no reversing sparks, high reliability, low noise, long life, small size, light weight, simple control, etc., which can be said to be the highest efficiency speed regulating motor at present.

Our company is a long-term cooperative customer with Fuxing Weiye, and their DC permanent magnet brushless motor control module is the best I have ever seen in the industry. For so many years, the defective rate of their products has been controlled within 1, and the fit with us is very high, which is why we have been cooperating until now. These can be found.

Electric drive instead of mechanical transmission is a revolutionary technological progress in the equipment manufacturing industry, rare earth permanent magnet motor as the main carrier of technological change, has a strong comprehensive performance advantage, the main characteristics of permanent magnet brushless DC motor are as follows:

First, high efficiency:

The permanent magnet brushless DC motor is a synchronous motor, and the permanent magnet characteristics of the rotor determine that the motor does not need to be excited by the rotor like the asynchronous motor, so there is no copper and iron consumption on the rotor, and its efficiency is 5%-12% higher than that of the asynchronous motor of the same capacity under the rated load.

At the same time, the low permeability and high internal resistance of the NdFeB material itself and the laminated structure of silicon steel sheet are adopted for the rotor core, which reduces the eddy current loss and avoids the thermal demagnetization of the NdFeB material.

Second, the range of high-efficiency zone is wide

Under the rated load, the range where the efficiency of the permanent magnet brushless DC motor system is greater than 80% accounts for more than 70% of the speed range of the entire motor.

Third, the power factor is high

The rotor of the permanent magnet brushless DC motor does not need to be excited, and the power factor is close to 1.

Fourth, the starting torque is large, the starting current is small, and the overload torque is large

The mechanical characteristics and adjustment characteristics of the permanent magnet brushless DC motor are similar to those of other excited DC motors, so its starting torque is large, the starting current is small, the adjustment range is wide, and there is no need for starting windings like synchronous Shenxiao and motors. In addition, the maximum overload torque of the permanent magnet brushless DC motor can reach 4 times of its rated torque.

The permanent magnet brushless DC motor is suitable for long-term low-speed operation and frequent start and stop occasions, which is impossible for the frequency converter governor to drag the Y series motor.

Fifth, the motor power density is high

Compared with the asynchronous motor, the output power of the permanent magnet brushless DC motor is 30% higher than that of the asynchronous motor when the volume and maximum working speed are the same.

6. Strong adaptability:

Under the premise of closed-loop speed control, when the power supply voltage deviates from the rated value by +10% or -15%, the ambient temperature difference is 40K and the load torque fluctuates from 0-100% of the rated torque, the steady-state deviation between the actual speed of the permanent magnet brushless DC motor and the set speed is not greater than 1% of the set speed.

7. Stable control performance

The permanent magnet brushless DC motor is an automatic speed regulation system, which will not produce oscillation and out-of-step when the load is abruptly changed.

8. Simple structure and easy maintenance

The permanent magnet brushless DC motor has the characteristics of a DC motor and the structure of an AC asynchronous electric shirt lifter, which is simple and easy to maintain.

Permanent magnet DC motor is divided into permanent magnet DC brushless motor and permanent magnet DC brush motor according to whether there is a brush, as the name suggests, the brush motor is a DC motor containing brushes, on the contrary, it is a brushless motor, and the range of applications of the two motors is very wide, so the difference between brushless motor and brush motor is **? Let's take a look at the lack of fronts

1. Differences in principle

The brushed motor is a motor that contains a brush device to convert electrical energy into mechanical energy or convert mechanical energy into electrical energy, which is different from brushless motors, which remove brushes and are an integrated product composed of motor body and driver.

2. Structural differences

The structure of brushless motor and brushed motor is just opposite, the rotor of the brushed motor is the coil winding, the stator is the permanent magnet steel, the rotor of the brushless motor is the permanent magnet steel, and the stator is the coil winding.

3. Scope of use

Brushed motors are usually used in ordinary equipment, and brushless motors are mainly used in high-precision equipment.

4. Working life

In the case of continuous work of the brush motor and the brushless motor at the same time, the working life of the brush motor is about several hundred hours, and the life of the brushless motor can reach tens of thousands of hours when the bearing is selected well.

5. Noise level

The brushed motor has the noise generated by the wear of the brush, and the brushless motor has no brush, which runs smoothly and the friction is greatly reduced, and the noise is relatively low and there are many socks.

6. Efficiency transformation

The efficiency conversion of brushless motors is about 90%, and the efficiency of brushed motors can only reach about 70%.

Because the output power of the brush motor is small, and the heat is large, most of the electric energy is converted into heat energy, so the output power is small and the efficiency is low.

7. The cost is high

The manufacturing cost of brushed motors is lower than that of brushless motors.

The above is the difference between permanent magnet brushless DC motor and brushed motor, I hope it can help you

First, the composition is different.

1. The brush of the permanent magnet DC motor is mainly composed of the stator and the rotor, the carbon brush hand search and other parts, the stator has a magnetic pole (winding type or permanent magnet type), and the rotor has a winding.

2. The brushless permanent magnet DC motor is mainly composed of stator and rotor and other parts, and there is no carbon brush.

Second, the working principle is different.

1. After the permanent magnet DC motor is energized, a magnetic field is also formed on the rotor, and there is an angle between the stator and the magnetic pole of the rotor, so that the motor rotates under the mutual attraction of the magnetic field of the stator and rotor. By changing the position of the brushes, you can change the direction of the angle between the magnetic poles of the stator and rotor, and thus the direction of rotation of the motor.

2. The brushless permanent magnet DC motor is mainly electronically commutated by the brushless motor, the coil does not move, and the magnetic pole rotates. Through the Hall element, the position of the poles of the permanent magnet is sensed, and according to this perception, the direction of the current in the coil is switched at the right time using an electronic circuit to ensure that the magnetic force in the correct direction is generated to drive the motor.

Third, the advantages are different.

1. The DC brush motor has fast starting response speed, large starting torque, stable speed change, almost no vibration is felt at the speed from zero to maximum, and it can drive a larger load when starting.

2. The starting resistance of the brushless motor is large (inductive reactance), so the power factor is small, the starting torque is relatively small, there is a buzzing sound when starting, and it is accompanied by strong vibration, and the driving load is small when starting.

Encyclopedia - Brushed DC motor.

Encyclopedia - Brushless DC motor.