Systems and methods involving motor drive ground fault interrupts
AssigneeHamilton Sundstrand Corporation
InventorsSastry V. Vedula, Carl A. Wagner
Life of this patent
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Abstract
A method comprises determining whether a ground fault on a bus (110) operative to drive the system (100) exceeds a first threshold level, (502) receiving values of phase currents of a first motor, (504) calculating a sum of the values of the phase currents of the first motor (106) responsive to determining that the ground fault on the bus exceeds the first threshold value, and (504) determining whether the sum of the values of the phase currents of the first motor (106) exceeds a second threshold value (506).
Claims18
A method for controlling a system comprising:
- determining whether a ground fault on a bus (110) operative to drive the system (100) exceeds a first threshold level;
- (502)
- receiving values of phase currents of a first motor;
- (504)
- calculating a sum of the values of the phase currents of the first motor (106) responsive to determining that the ground fault on the bus exceeds the first threshold value;
- (504)
- determining whether the sum of the values of the phase currents of the first motor (106) exceeds a second threshold value;
- (506)
- receiving values of phase currents of a second motor;
- (504)
- calculating a sum of the values of the phase currents of the second motor (106) responsive to determining that the ground fault on the bus exceeds the first threshold value;
- and (504)
- determining whether the sum of the values of the phase currents of the second motor exceeds the second threshold value (506).
A method for controlling a system comprising:
- determining whether a ground fault current on a bus operative to drive the system exceeds a first threshold level;
- (402)
- receiving a voltage value of a neutral node of a first filter connected to a first motor responsive to determining that the ground fault on the bus exceeds the first threshold value;
- and (404)
- determining whether the voltage value of the neutral node of the first filter exceeds a second threshold value (406).
A system comprising:
- a first motor;
- (106)
- a first inverter (102) connected to the first motor (106) operative to receive power from a bus (110) and output multi-phase power to the first motor (106);
- a first processor (108) operative to:
- determine whether a ground fault on the bus (110) exceeds a first threshold level, receive values of phase currents of the first motor (106);
- calculate a sum of the values of the phase currents of the first motor (106) responsive to determining that the ground fault on the bus (110) exceeds the first threshold value;
- and
- determine whether the sum of the values of the phase currents of the first motor (106) exceeds a second threshold value;
- a second motor (206);
- a second inverter (202) connected to the second motor (206) operative to receive power from the bus (110) and output multi-phase power to the second motor (206);
- and
- a second processor (208) operative to:
- determine whether a ground fault on the bus (110) exceeds the first threshold level, receive values of phase currents of the second motor (206);
- calculate a sum of the values of the phase currents of the second motor (206) responsive to determining that the ground fault on the bus (110) exceeds the first threshold value;
- and
- determine whether the sum of the values of the phase currents of the second motor (206) exceeds the second threshold value.
Dependencies are inferred from the claim text.