Sigma-Delta ADC architecture and system clock synchronization

Question

I have always thought that Sigma-Delta ADC architecture is not ideal for a 3-phase motor current measurements as it is not possible to synchronize such a converter to a system clock. Is this really the case?

Mark.Don · Accepted Answer

Sigma Delta converters are widely used in motor drives where high signal integrity and galvanic isolation are required. Despite the lack of defined sampling instant, Sigma Delta conversion can be used to measure motor currents precisely without aliasing effects as for the control purposes, only the average component of the current is of interest. Please go into the following article on learn more on how to use these converter architecture in motor control applications. 
 https://www.analog.com/en/technical-articles/sigma-delta-conversion-used-for-motor-control.html)

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Sigma-Delta ADC architecture and system clock synchronization