MOTOR DRIVE DEVICE, MOTOR DEVICE AND FAN DEVICE

To provide a motor drive device capable of more accurately detecting a current flowing to a motor.SOLUTION: The present invention relates to a motor drive device comprising: an inverter circuit which causes a current to flow to a motor; a first measurement point and a second measurement point in a path of the current flowing to the motor; a current measuring resistor provided between the first measurement point and the second measurement point; a wiring pattern connecting the first measurement point with the current measuring resistor and connecting the current measuring resistor with the second measurement point; and a control circuit for controlling the current supplied by the inverter circuit to the motor based on a resistance value of the wiring pattern, a resistance value of the current measuring resistor, and a voltage between the first measurement point and the second measurement point.SELECTED DRAWING: Figure 1 【課題】モータに流れる電流をより正確に検出可能なモータ駆動装置を提供することである。【解決手段】モータ駆動装置であって、モータに電流を流すインバータ回路と、前記モータに流れる電流の経路における第１測定点及び第２測定点と、前記第１測定点と前記第２測定点との間に設けられた電流測定用抵抗器と、前記第１測定点と前記電流測定用抵抗器との間、及び前記電流測定用抵抗器と前記第２測定点との間を接続する配線パターンと、前記配線パターンの抵抗値、前記電流測定用抵抗器の抵抗値、及び前記第１測定点と前記第２測定点との間の電圧、に基づいて前記インバータ回路が前記モータに供給する電流を制御する制御回路とを備える。【選択図】図１