Optimized winding drive
AssigneeDeutsche Thomson-Brandt GmbH
InventorsPeter Mahr, Klaus Oldermann
Life of this patent
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Abstract
In a tape transport for recording and/or reproducing signals by means of a recording medium using separate winding motors for driving the winding plates, the drive of the winding motors servo units is constructed as open-loop control devices and/or closed-loop control devices. Such servo units can advantageously be used for open-loop control and/or closed-loop control of the drive of the winding motor even during a braking operation.
Claims9
Method for controlling the drive of a winding device, in particular the winding device of an appliance for transporting a recording medium in tape form, having two separate winding motors, in which the winding device is braked by means of stepwise controlling the two winding motors, said method comprising the steps of:
- a) measuring respective instantaneous rotary movement of the two winding motors,
- b) comparing each respective measured instantaneous rotary movement with a desired value,
- c) deriving signals from both winding motors representative of differences between measured instantaneous values and the respective desired values,
- d) controlling the energization of each winding motor as a function of a sequence of paired reference values corresponding to respective rotational speed values, and
- e) progressing to a subsequent pair of reference values as soon as the rotational speed and assigned reference value of the respective winding motor correspond to one another.
Dependencies are inferred from the claim text.