ACM94 Machine for dynamic balance of rotors
The ACM 94 machine is designed basically for the balancing of car alternator rotors and starter motor armatures, but it can be used for the balancing of any other various types of rotors.

The machine has a frame of aluminum profiles with steel upper plate, upon which all working units are disposed including the two measuring supports, the measuring and displaying control units and the electric cabinet. The measuring supports can be shifted along their dovetail guideways according to the workpiece shaft length and fixed by means of the handles provided for the purpose. Workpiece drive is performed by means of AC motor (with variable speed controller) through belt transmission, disposed below the workpiece axis for easier operation.

The measuring control unit is disposed on the topside of the machine in line with the operator’s sight, adjustable by height, angular orientation and inclination. A colour touch screen display visualizes the results to the operator. The automatic cycle is started by pressing the control unit button (green) or by pressing the additional push-button, fixed on the machine frame below.
The workpiece is supported on two immobile wheels.
Two piezo-electric transducers (each disposed on the respective measuring support) are used for measuring of the dynamic reactions of the rotating workpiece.

The angular coordinate of the workpiece is established by means of sensor that transmits a pulse to the measuring device on every workpiece revolution. Photoelectric sensor or proximity switch can be used for the purpose, depending on the possibilities presented by the processed rotor. In the particular case of application for armatures a photoelectric sensor is suitable, actuated by means of colored stitch mark applied by the operator on the stack O. D. (or commutator O.D.) between the slots.

Data measurements and machine control is performed by means of Mitsubishi programmable controller with special ADC (Analogue Digital Converter) that permits 19000 readings per second to be taken during the dynamic test, synchronized with the revolutions of the rotor.

The machine software calculates the spots and weight to be removed (or added) for unbalance correction. The results are then shown on the colour display screen as mass value and angle. Specialized software for easier presenting of the measured values is supplied with the machine according to the specific form of the parts to be processed, showing the exact places and weight to be added on the operator panel screen. Static unbalance can be measured and displayed as well.

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Up to 99 programs can be stored in the PLC memory for different types of rotors that can be accessed by choosing their respective number on the screen. Machine calibration is performed semi-automatically and doesn’t require any special operator skills and special master workpiece. During the calibration procedure two measurements of the workpiece are performed. Before taking the second measurement, the operator should put a standard trial weight on the workpiece.
Readjustment is fast. The moving parts are fixed with handles.

 

No

Parameter

Value
1 Maximum rotor OD Ø150 mm
Maximum rotor OD using special belt supporting plate Ø235 mm
2 Maximum shaft diameter Ø30 mm
3 Maximum shaft length 490 mm
4 Maximum workpiece weight 24 kg
5 Accuracy of balancing at 10 kg. weight 1 gmm
Accuracy of balancing at 0.4 kg. weight 0.1 gmm
Sensitivity at 0.4 kg. weight 0.04 gmm
6 Maximum speed 2300 RPM
7 Average alternator rotor cycle time 6 seconds
8 Angular sensors available Photoelectric sensor 1 pcs.
Proximity sensor 2 pcs.
9 Power supply 220V
or request
10 Overall dimensions:
Length 622 mm
Width 550 mm
Height 1460 mm
11 Weight 180 kg

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