Procedure for control of physical parameter with two-pulse electronically commutated motor has current passed to stator winding by so-called block control in form of current blocks which are controlled by control signals

摘要

Current is passed to stator winding by controlled current blocks. Length of control signals to control current blocks is set by regulating device and current effective value is set by duty cycle. Length of control signals are limited in upper and lower range. If control signal is shorter than predetermined lower limit, duty cycle is decreased so effective value of current sinks and length of current blocks is increased. If control signal is longer than predetermined upper limit, duty cycle is increased so effective values increase and length of blocks decreases. A procedure for the control of a physical parameter with a two-pulse electronically commutated motor which is designed for the connection at a DC motor has the following steps: - the current is passed to the stator winding by a so-called block control in the form of current blocks which are controlled by control signals; - the length of the control signals for these current blocks is controlled by the control device according to the setpoint value; - a given lower threshold is established for the length of the control signals with the motor driving; - a given upper threshold is established for the length of the control signals with the motor driving; - when lower limit reaches threshold duty cycle is lowered by control by specific amount, if control signal length reaches upper limit, duty cycle is increased.