单片机外文翻译永磁无刷直流电机

中文1690字

BLDCM

BLDCM small size, light weight, it has a DC motor similar to the general good speed performance, without the existence of machinery for the device, electromagnetic interference noise and small, low maintenance requirements, reliability, good; and as a result of not required excitation power, efficiency is relatively high, it has been rapid development. A company based on ADI's ADSP-21992 chip high-speed brushless DC motor control system, which has a high-speed, high load moment of inertia, have greater motor starting torque characteristics.

DSP-based motor control system with the traditional single-chip motor control system and a dedicated chip motor control system, that is, a dedicated motor control mechanisms, user-programmable, scalable, and powerful, and so on; at the same time, overcome their respective shortcomings, such as peripherals and memory integrated into the chip to reduce circuit board area, reducing the number of system components to improve the CPU processing capacity, improve system reliability. System, the ultimate aim is the application of high-speed flywheel system brushless DC motor, therefore, very high speed processors, from the real-time performance to consider,

Need to select the highest possible processing speed of the chip. 2199x series and ADI's speed reached 160 M, and then to adapt to take into account their poor working environment, in this paper, we have chosen the ADSP-21992 as a core control chip.

(A) hardware

1. Control circuit

Mainly by the control circuit and its corresponding external ADSP21992 expansion circuit. Including the crystal oscillator circuit, extend outside the FLASH,

JTAG interface, power supply voltage conversion circuit, PWM interface, 1 / 0 interface and A / D interface circuit modules. ADSP21992 for the 160 M high-performance mixed-signal DSP chips, the chip in addition to a powerful data-processing capabilities, for motor control, but also to provide 6-channel PWM output, 8-channel 14-bit A / D conversion channels, 16 general-purpose I / 0 I, as well as three 32-bit dedicated hardware resources, such as counting unit.

2. Power circuit

Drive circuit from the diode rectifier bridge, filter capacitor and the IGBT inverter constituted; drive circuit using IR's I82130 dedicated MOs power device gate drive dedicated chip, the chip can not only achieve the optimal IGBT driver, and has a perfect protection, can significantly improve system integration and reliability; isolated part of the use of high-speed optocoupler HCPL4504, isolation from the role of potential.

3. Rotor position and current detection circuit

Due to current high-speed motor, back-EMF waveform distortion is more serious, it is not suitable for position sensorless control for easy installation, the use of small size, convenient installation and electromagnetic Hall sensor mounted on the end of stator windings, the output signal by the partial pressure , filter the buffer.

PI current regulator current aim is to achieve fast and accurate tracking of a given value, the incremental selection of PI regulator; speed PI regulator related to the system dynamic and static performance, it is separated from the use of integral PI regulator. Encountered in software design PI regulator design that is the proportion coefficient and integral coefficient kP selection of ki. System uses a factor of AD and Industrial standard procedures set forth in PI coefficient (Kp = 25, Wpi = kp / ki = 50Hz), and use the normal input in order to achieve DSPI / 0 I. LEM sensor module DC bi-directional high-frequency detection,