1、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, e
2、fficiency is relatively high, it has been rapid development. A company based on ADIs 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 traditio
3、nal 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 re
4、duce 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
5、 consider, Need to select the highest possible processing speed of the chip. 2199x series and ADIs 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 b
6、y 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 h
7、igh-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
8、counting unit. 2. Power circuit Drive circuit from the diode rectifier bridge, filter capacitor and the IGBT inverter constituted； drive circuit using IRs I82130 dedicated MOs power device gate drive dedicated chip, the chip can not only achieve the optimal IGBT driver, and has a perfect protection,
9、 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 s
10、uitable 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
11、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 int
12、egral 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, And the correspondin
13、g current signal directly to the sensor signal input voltage DSP A / D port for digital-to-analog conversion. 4. Protection Circuit Under-voltage protection circuit by detecting the battery voltage, when the battery voltage down to the closure of motor threshold, the battery does not over-discharge
14、to cause unnecessary damage, to protect the battery. AID voltage power conversion, if the under-voltage, under-voltage when the second location of a sign so that it can interrupt timer 0 to start from time to time, under-voltage shutdown over after five seconds, jump to self-test mode. MOSFET over-c
15、urrent protection circuit can protect the most current control will set the framework, illustrates the value reached when the motor shut down to avoid a high current through the MOSFET on the risk of burning. Over-current protection is the controller of the last line of defense, over-current protect
16、ion resistor is used in wire and Culture, current when the system exceeds the maximum protection of current value, the wire will be blown, Culture and Sport in order to play a protective effect. Drive motor in the process of running the system on the motor will speed - the current relevant control,
17、the controller to determine the electrical current and electric vehicles is in the relevant range of speed, if in the relevant context, the controller should not exceed current limiting settings based on speed control of electric vehicles； when the motor current and speed of electric vehicles is not related to serious,
