求专业电子方面英语高手翻译
The R-to-D board contains circuitry to control commutation for the scanner motor of theCAST-V tool. Commutation is the act of switching current through field windings tocause the rotor of the motor to rotate efficiently. The actual switching of the drivevoltage to the motor is accomplished by the commutator board 。The R-to-Dhoard provides control signals to the commutator board. The R-to-D board also providescircuitry to set the pattern of the sonic pulses as the head rotates
