PM Stepper Motor Larger Starting Torque
PM Stepper Motor Larger starting torque
DC brushless motor is a synchronous motor, brushless DC motor by the motor body and drive components, is a typical mechanical and electrical integration products. DC brushless motor has a fast response, a large starting torque, from zero speed to rated speed with rated torque can provide the performance, but the advantages of DC motor is also its shortcomings, because the DC motor to produce the rated load Constant torque performance, the armature magnetic field and the rotor magnetic field to be constant to maintain 90 °, which will be through the carbon brush and commutator.
Carbon brush and commutator in the motor rotation will produce sparks, toner in addition to the components will cause damage, the use of occasions are also limited. AC motor without carbon brush and commutator, maintenance-free, strong, wide application, but the characteristics of the DC motor to achieve the equivalent of the performance of complex control technology to be used to achieve. Now the rapid development of semiconductor power components to switch the frequency of many, to enhance the performance of the drive motor.
There are many microprocessors that will control the necessary functions of the motor in the chip, and the volume is getting smaller and smaller; like analog / digital converters, pulse width modulation and so on. DC brushless motor that is electronically controlled AC motor commutation, similar to the DC motor characteristics and no DC motor mechanism on the lack of an application.
Microprocessor speed is faster and faster, can be achieved AC motor control placed in a rotating two-axis orthogonal coordinate system, the appropriate control AC motor in the two-axis current component, to achieve similar DC motor control and DC motor with the equivalent performance.
Practical Brushless motor is closely related to the development of electronic technology, microelectronics technology, digital technology, automatic control technology and materials science. It is not limited to the field of AC and DC, but also involves electric, power generation and energy conversion and other fields.
With the development of China's industrial economy, motor has been widely used. According to statistics, the motor system power consumption accounts for about 60% of the national electricity consumption, of which fan electricity accounts for 10.4% of the national electricity consumption, pump motor accounted for 20.9%, 9.4% of the compressor, but more than 80% The efficiency of the motor products is 2% -5% lower than that of the foreign advanced level, and the efficiency of the motor system is 10% -20% lower than that of the foreign advanced level.Therefore, there is a huge demand in improving the efficiency of the motor system and strengthening the system energy saving management.
At present, China's total installed capacity of electric motors has reached more than 400 million kW, the annual power consumption of 1.2 trillion kWh, accounting for 60% of the total electricity consumption, accounting for 80% of industrial electricity consumption, including fans, pumps, The total capacity of more than 200 million kW, the annual power consumption of 800 billion kWh, accounting for about 40% of the total electricity consumption, so the energy requirements on the motor greatly, but also the best energy-saving effect of the place. With the new motor design, new technology and new materials, by reducing the electromagnetic energy, thermal energy, mechanical energy loss to improve the output efficiency, energy efficient motor than the traditional motor efficiency of about 3% -5%, currently reached 2 energy efficiency indicators of the motor accounted for Less than 10%, so its development space is vast.