Control System for Single-Phase Induction Motor and Control Method for Single-Phase Induction Motor

Control system for a single-phase induction motor comprising:

• at least one electronic control circuit (6),
• at least a main switch (3),
• at least an auxiliary switch (4),
• at least one voltage conditioner block (5),
• the main switch (3) being electrically associated to the main winding (21) of the single-phase induction motor (2),
• the auxiliary switch (4) being electrically associated to an auxiliary winding (22) of the single-phase induction motor (2),
• the electronic control circuit (6) being electrically associated to the voltage conditioner block (5) by way of first and second power terminals (9,10),
• the electronic control circuit (6) being electrically associated to the main and auxiliary switches (3,4) by way of first and second command terminals (13,14),
• the main and auxiliary switches (3,4) being turned on or off by the electronic control circuit (6), in order to energize or de-energize the main (21) and auxiliary (22) windings,
• the control system for a single-phase induction motor and the single-phase motor (2) being electrically associable to an alternating voltage source (1),
• wherein:
• the voltage conditioner block (5) is electrically associated and in parallel to the auxiliary switch (4) or to the main switch (3) by way of first and second connection terminals (7,8),
• the voltage conditioner block (5) is capable of accumulating electrical energy when the auxiliary switch (4) is turned off,
• the inductive behavior of the auxiliary winding (22) or of the main winding (21) of the single-phase induction motor (2) is capable of filtering noise and transients existing in the alternating voltage source (1).

Control method for a single-phase induction motor, the single-phase induction motor (2) comprising a main winding (21) and an auxiliary winding (22), the main (21) and auxiliary (22) windings being associable respectively to the main (3) and auxiliary (4) switches,

• said method comprising:
• electrically connecting the main (21) and auxiliary (22) windings of the single-phase motor (2) to a first end of the main (3) and auxiliary (4) switches respectively;
• connecting a voltage conditioner block (5) in parallel to the auxiliary switch (4) by way of first and second connection terminals (7,8);
• connecting the voltage conditioner block (5) to an electronic control circuit (6) by way of first and second power terminals (9,10);
• connecting the electronic control circuit (6) to the main and auxiliary switches (3,4) by way of first and second command terminals (13,14) of the electronic control circuit (6) and first and second drive terminals of the switches (31,41);
• electrically connecting the single-phase induction motor (2), a first connection terminal (8) of the voltage conditioner block (5) and a second end of the main (3) and auxiliary (4) switches to an alternating voltage source (1);
• if the main (21) and auxiliary (22) windings are turned off, supplying electrical power to the voltage conditioner block (5) by way of first and second connection terminals (7,8);
• if the main (21) and auxiliary (22) windings are turned on by the electronic control circuit (6), by way of first and second drive terminals (31,41) of the main (3) and auxiliary (4) switches, providing electrical power greater than a minimum electrical voltage value (Vmin) to the electronic control circuit (6), for a start-up time (tp), by way of energy accumulated in the voltage conditioner block (5);
• and
• if the main winding (21) is turned on and the auxiliary winding (22) is turned off, providing power to the voltage conditioner block (5) by way of first and second connection terminals (7,8).