Control mechanism for a separately excited DC drive motor and method for control of a DC drive motor
AssigneeDruckmaschinen AG Heidelberger
InventorAnton Rodi
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Abstract
In combination, a control mechanism for a separately excited DC drive motor, and a device for generating an exciter current to be supplied to a field winding of the motor, includes a measuring device for measuring operational values of the motor, and a device connected to the measuring device for adjusting the exciter current, in accordance with measurement results of the measured values, to a determined value at which a preselected operational characteristic exists, and the exciter current is kept constant at the determined value.
Claims11
In combination, a control mechanism for a separately excited DC drive motor being operated under given current and voltage conditions, and a device for generating an exciter current to be supplied to a field winding of the motor, comprising a measuring device for measuring said operating current and voltage conditions;
- current adjusting means connected to said measuring device for adjusting the exciter current, in response to the measured motor operating current and voltage conditions, to a determined value such that at least one of a preselected ratio of armature voltage to rotary speed and a preselected ratio of armature voltage to torque is attained;
- and means for maintaining the exciter current constant at said determined value.
Method for operating a separately excited DC drive motor having a field winding and an operational characteristic including at least one of a preselected ratio of armature voltage to rotary speed and a preselected ratio of armature voltage to torque, and a current converter and logic system for controlling the armature voltage and exciter current value comprising the steps of:
- controlling the rotary speed of the motor by controlling the armature voltage;
- varying the exciter current value so as to select the operational characteristic of the motor, and subsequently maintaining the exciter current at said exciter current value.
Dependencies are inferred from the claim text.