Overload prevention system to improve intermittent load capacity of electric drive applications

摘要

An overload prevention system and method for an electric circuit having a plurality of components is disclosed, where each component has a set of pre-computed parameters. For each component, monitored parameters are observed; a limited value is computed using the pre-computed and monitored parameters; and it is determined if the limited value reached a limit. If the limited value reaches the limit; the system limits one of the monitored parameters. Pre-computed parameters can include time constant and rated current; monitored parameters can include current; and limited value can be component temperature. A time constant, rated current and rated temperature can be pre-computed such that the temperature stays at or below the rated temperature when the current is substantially equal to the rated current. Per unit values can also be used such that per unit temperature stays at or below unity when per unit current is substantially equal to unity.

主权项

1. An overload prevention method for an electric circuit having a plurality of components including a first component and a second component, the first component having a first set of pre-computed parameters, and the second component having a second set of pre-computed parameters, the overload prevention method comprising:
observing, by a sensor device, a first set of monitored parameters for the first component; observing, by the sensor device, a second set of monitored parameters for the second component; computing, by a microcontroller, a first limited value for the first component using the first set of pre-computed parameters and the first set of monitored parameters; computing, by the microcontroller, a second limited value for the second component using the second set of pre-computed parameters and the second set of monitored parameters; determining, by the microcontroller, if the first limited value has reached a first limit or the second limited value has reached a second limit; limiting, by the microcontroller, one of the first set of monitored parameters if the first limited value has reached the first limit; and limiting, by the microcontroller, one of the second set of monitored parameters if the second limited value has reached the second limit.