Apparatus and method for transferring a measured angular location of unbalance to the circumference of a rotor

Claim 3

A method as claimed in Claim 1, characterised in that the interval in time between the pulses delivered by the pulse generator (22) is monitored.

Claim 4

A method as claimed in Claim 1 or 2, characterised in that the speed of rotation of the rotor is monitored during the determination of the angular location until it stops.

Claim 5

A balancing machine for carrying out the method as claimed in Claim 1 having - a rotor mounting (2, 4), - a rotor drive (16-21 ) which does not have any parts rotating in synchronism with the rotor (1) to be balanced, - measuring transducers (5, 6) to produce measured signals representing the influence of the unbalance on the rotor mounting, - an evaluation circuit (7) to determine the angular location of the unbalance with respect to a fixed reference position on the rotor, with the aid of the measured signals, - a signal processing circuit (27) which forms, from the angular location determined and from a first numerical value representing a measure of the circumference of the rotor in the balancing plane in non-dimensional units, a second numerical value which indicates the position of the unbalance with respect to the reference position in the said units and which stores this second numerical value, characterised by - a pulse generator (22) coupled to the rotor (1) to be balanced to produce a number of pulses proportional to the angle of rotation of the rotor, - an up-down counter (23), to the counting input of which the pulses of the pulse generator (22) are supplied, - a reference-position indicator (10, 11, 24) to produce a reference signal appearing after each revolution of the rotor with the aid of the reference position, which signal is fed to the evaluation circuit and to the reset input of the counter, - a store (26) which is connected to the output of the counter and which can be activated by the reference signal after each revolution of the rotor to take over the counter contents, - a comparator circuit contained in the signal processing circuit (27) to compare the stored second numerical value with the contents of the counter, - an indicator unit (28) connected to the comparator circuit to signal the equality of the second numerical value and the counter content.

Claim 6

A balancing machine as claimed in Claim 4, characterised in that a revolution counter (30) is provided to count the revolutions of the rotor after the rotor drive has been switched off.

Claim 7

A balancing machine as claimed in one of the preceding Claims, characterised in that the pulse generator (22) is so designed and constructed that the pulses delivered by it appear at intervals of less than three degrees of angle of rotation of the rotor.

Claim 8

A balancing machine as claimed in one of the preceding Claims, characterised in that a turning motor (33) is provided to turn the rotor, after its stopping, into a position in which the indicator unit signals the equality of counter content and second numerical value.

Claim 9

A balancing machine as claimed in one of the preceding Claims, characterised in that a correction unit is provided to compensate for the error which results from a possible difference between the counter contents transferred to the store (26) and the actual circumference of the rotor in the balancing plane.