Patent ID: 6282498
Filing Date: 2001-08-28
Classification: H02P

Abstract:
A load monitoring apparatus, comprising:a sampling-information memory unit for storing a plurality of sampling cycles and the number of sampling recurrence corresponding to each sampling cycle;a signal output unit for outputting a sampling signal in accordance with the plurality of the sampling cycles and the number of sampling recurrence corresponding to each sampling cycle stored in said sampling-information memory unit;a sampling unit for sampling a current value and a voltage level of a motor for driving a machinery in response to the sampling signal time-sequentially output from said signal output Unit;an electric-power calculating unit for calculating electric-power value of the motor in accordance with a result of the sampling performed by said sampling unit;a comparison unit for comparing the electric-power value of the motor calculated by said electric-power calculating unit with an absolute-value range and a relative-value range which is determined in accordance with a previously calculated electric-power value of the motor; anda determination unit for determining an abnormal load of the motor in accordance with a result of the comparison performed by said comparison unit.