ABB 3HNM07485-1/07 Input module

The three-phase servo amplifiers of Series TBF are based on the principle of the speed control with secondary current control loop. In addition to that the current-mode logic controls the commutation of the electronically commutated servo amplifier (brushless). The signal flow of this functional group is shown in the following figure.

Principle of the Amplifier 

The speed control loop consists of speed controller, circuit, motor and speed measurement. The nominal speed value is externally given, e.g. through potentiometer, NC control or something similar. The actual speed value is determined at the motor shaft by a resolver. The difference between nominal value and actual value is formed at the summing point and transmitted to the speed controller. The speed controller then defines the required current set value.

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