System for circulating a liquid

A system for circulating a liquid, which comprises at least one pump, connectable to at least one pipe for a flow of a liquid, and at least one motor assembly, said motor assembly comprising:

• at least one electric motor—for driving said pump;
• sensing means of at least two electrical parameters correlated with operation of said electric motor;
• processing means functionally connected to said sensing means and configured to determine, based on signals provided by said sensing means, at least one fluid-dynamic parameter correlated with the flow of said liquid through said pipe;
• a memory unit containing at least one data set representing a respective relationship between mechanical parameters correlated with the operation of said electric motor and at least one corresponding fluid-dynamic parameter correlated with an operation of said pump;
• an electronic board having mounted thereon said sensing means, said processing means and said memory unit;
• a firmware installed in the electronic board that implements said electric motor, said firmware comprising at least two software modules that interface with each other and comprising at least one first module, containing functions to control the electric motor, and at least one second module, in turn containing software based on a calculation algorithm that makes it possible to supply hydraulic measurements correlated with the operation of said pump;
• said processing means being configured to calculate, as a function of values measured by said sensing means, at least one mechanical parameter of operation of said electric motor and to determine, by means of said calculated mechanical parameter of operation of said electric motor and said representative data, said at least one fluid-dynamic parameter correlated with the flow of said liquid;
• said electric motor being a brushless motor.