| 摘要 |
A novel method of controlling a stepping motor comprises applying pulsed power (P1, P2) to one or two phases ( theta 1, theta 2) of the motor for variable pulse duration varied according to a programme in successive steps (P1, P2; P5, P3; P6, P4), the timing of the steps (S1, S2) being controlled to determine the stepping rate, and the programmed variation of the pulse duration being arranged so to vary the ratio of energisation of adjacent phases ( theta 1, theta 2) in successive steps (S1, S2) that several successive steps (S1, S2) are required to step the motor between adjacent phases ( theta 1, theta 2). Apparatus for carrying out the method comprises a stepping motor (11) with several phase windings and characterised by a microprocessor (1) arranged to load a downcounter (3) with a desired division factor to divide a clock signal to produce the desired step rate (T2), the downcounter (3) being arranged to drive a motor step counter (8) arranged to determine the steps of energisation/deenergisation of the phases ( theta 1- theta 4) through a PROM, programmable read only memory (10) arranged to apply pulsed power (P1, P2) to one or two adjacent phases ( theta 1, theta 2) for the variable pulse durations. |
