Method for the operation of a circuit arrangement for controlling or regulating the acceleration (starting), braking and rotation speed of a three-phase asynchronous motor

摘要

In the case of a method for the operation of a circuit arrangement for controlling or regulating the acceleration, braking and rotation speed of a three-phase asynchronous motor comprising a regulator (R) whose first input is connected to a device for detecting the actual rotation speed of the motor, whose second input is connected to a device for presetting the required rotation speed, and whose output is connected to a plurality of thyristor pairs (1-5) (which are connected in parallel in opposite directions) in order to control, via a phase-gating controller (PhS), the three-phase supply fed to the motor windings from the motor terminals, a rotation direction reversing circuit furthermore being provided in such a manner that the assignment of at least two phases (L1, L3) to two motor windings (U, V) is effected in a replaceable manner by turning the respective thyristor pairs (1, 2 or 5, 6 respectively) on or off respectively by means of the control or regulating arrangement, it is provided in order to optimise the braking process that DC braking is optionally used for braking, in such a manner that, of the thyristor pairs (1, 2 and 4, 5) which are connected in parallel in opposite directions, of the two phases (L1, L3) (whose respective assignment to the motor windings can be interchanged in order to reverse the rotation direction), in each case one thyristor (1.2, 2.1 and 4.2, 5.1 or 1.1, 2.2 and 4.1, 5.2) of each pair is activated and in each case one thyristor is switched off, the respectively activated thyristors of each phase (L1, L3) being in opposite directions, and both ... Original abstract incomplete. <IMAGE>