The combination of motor and DSP control is an important direction of motor development
The electric dental chair adopts the rare earth permanent magnet brushless DC motor drive system. This system combines the rapid development of brushless DC motor and DSP control technology in recent years, and selects a DSP controller to complete the two rare earth permanent magnet brushless DC motors. Control, featuring low cost and high performance.
Rare earth permanent magnet brushless motor meets the special requirements of medical industry for all aspects of medical equipment because of its high efficiency, good performance, simple structure, simple heat dissipation and low noise. Therefore, the linear drive organization driven by rare earth permanent magnet brushless motor replaces the brush motor drive organization and the single-phase AC asynchronous motor drive organization, which has outstanding social meaning and broad market prospects.
The electric dental seat has two degrees of freedom, pitch and lift. The servo system selects two rare earth permanent magnet brushless DC motors as the main components of motion control, and drives them separately for two degrees of freedom.
The motor control part only selects one DSP (digital signal processor) chip TMS320LF2407A to complete the control of two brushless motors, making full use of the rich on-chip resources of DSP, and selects the DSP supply for the PWM inputs of the two motors, eliminating the logic. The chip improves the reliability of the system. The memory chip is extended by the SPI on-chip serial peripheral, and the FRAM (non-volatile memory) is selected to have the power-down maintenance function, and the memory of the position of the power seat in the case of power-off is completed.
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