Current detection device, current detection method, and non-transitory storage medium

A current detection method performed by a calculation device that is configured to measure a drive current output by an inverter configured to drive a motor, and calculate a control current corresponding to a magnitude of the drive current, the current detection method comprising:

• calculating a first current value that is a current value obtained by converting a non-rated drive current into a digital value using a first resolution, the non-rated drive current being a current that fluctuates in a larger range than a preset rated value out of the drive currents;
• calculating a second current value that is a current value obtained by converting a within-rating drive current into a digital value using a second resolution, the within-rating drive current being a current that fluctuates within the preset rated value out of the drive currents;
• outputting the second current value as a value of the control current during a period in which the first current value is within a preset first threshold range;
• and
• outputting the first current value as the value of the control current during a period in which the first current value is outside the first threshold range.

A non-transitory storage medium storing instructions that are executable by one or more processors and cause the one or more processors to perform functions comprising:

• measuring a drive current output by an inverter that drives a motor, and calculating a control current corresponding to a magnitude of the drive current;
• calculating a first current value that is a current value obtained by converting a non-rated drive current into a digital value using a first resolution, the non-rated drive current being a current that fluctuates in a larger range than a preset rated value out of the drive currents;
• calculating a second current value that is a current value obtained by converting a within-rating drive current into a digital value using a second resolution, the within-rating drive current being a current that fluctuates within the preset rated value out of the drive currents;
• outputting the second current value as a value of the control current during a period in which the first current value is within a preset first threshold range;
• and
• outputting the first current value as the value of the control current during a period in which the first current value is outside the first threshold range.