Circuit arrangement for regulating the rpm of a series motor
AssigneeTelefunken electronic GmbH
InventorHeinrich Zeitvogel
Life of this patent
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Abstract
A circuit arrangement for regulating the rpm of an electric motor having series connected field and armature windings 1, 4 comprises a controllable rectifier 5 which is connected in series with the motor and is controlled by a phase control unit 30 as a function of a control signal obtained at armature winding 1 and conducted via an operational amplifier 12. To achieve a very constant rpm and a high regulating speed with simple means, each terminal of armature winding 1 is connected to one input 10, 11 of a differential amplifier 12 whose output 15 is connected to one input 19 of a comparator. At its second input, the comparator is given a desired value signal which is changed in dependence upon the current flowing through armature 1.
Claims9
A circuit arrangement for controlling the rpm of an electric motor having series-connected field and armature windings to which a controllable rectifier is connected in series, said rectifier being controlled by a phase control unit as a function of a control signal obtained at the armature winding and conducted through an operational amplifier, characterized in that one terminal (2, 7) of the armature winding (1) is connected to the inverting input (10) of the operational amplifier (12), and the other terminal (2, 7) is connected to the non-inverting input (11) of said operational amplifier so that the voltage between the inverting and non-inverting inputs of said operational amplifier is proportional to the voltage across the armature winding, the output (15) of the operational amplifier (12) is connected to one input (19) of a comparator (20) whose second input (21) is connected to a desired value generator (23), and the output (32) of the comparator (20) is connected to the phase control input (31) of the phase control unit (30).
Dependencies are inferred from the claim text.