Heat dissipation dc cooling fan motor control circuit of frequency conversion
The application of heat dc cooling fan has become very common in our daily life, the frequency conversion motor? Whether there is a close link with the radiator cooling fan? Frequency conversion motor with dc motor, but adopts ac motor structure features. That is, while the external access is dc, but purchasing with dc - Ac variable voltage inverter control technology, completely according to the principle of ac motor ontology and go to jobs. Therefore, variable frequency motor is also called 'control variable frequency synchronous motor, motor speed N depends on the controller is set frequency F. Frequency conversion motor drive circuit consists of two parts, the main circuit and control circuit, now will the two parts are integrated into the same chip, such as long as the use of a device can achieve all of variable frequency motor control function, simplify the circuit structure. As the industry attention to energy saving and noise suppression, many industrial products tend to use brushless motor, the motor micro controller put forward higher requirements, as a new generation of motor control DSP chip, cost-effective TMS320C240 is very suitable for to complete the task. Heat dissipation dc cooling fan of the three-phase y connection with frequency conversion motor control circuit, dc power supply of the MOS tube three-phase inverter circuit to the motor of the three winding time-sharing power supply. Every moment, there are only a pair of three pairs of winding winding electricity through, produce a magnetic field, then stop supply power to the winding, power supply, and adjacent to the other winding the stator magnetic field in the axis rotate 120 ° in the space, the role of the rotor by magnetic force with the stator magnetic field to rotate 120 °. The voltage on A + B - in turn ,A + C - B + C - 、B+A- 、C+A- C + B - , it forms a rotating magnetic field in the stator, so the motor turns continuously. Radiator cooling fan experts know that as long as we open cooling dc cooling fan motor, can see the cooling dc cooling fan USES frequency conversion motor, it from the position of the coil can be identified. Frequency conversion motor control circuit, control chip will be integrating DSP function and driving equipment, simplify the circuit structure. Through the control chip programming, to change the motor speed.