Patent ID: 11949357
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The control circuit according to claim 2, wherein
the first resistance is a resistance component of a fourth wire provided between a first phase output of the three-phase inverter and the three-phase direct current motor, the fourth wire being formed from a material containing copper,
the second resistance is a resistance component of a fifth wire provided between a second phase output of the three-phase inverter and the three-phase direct current motor, the fifth wire being formed from a material containing copper,
the third resistance is a resistance component of a sixth wire provided between a third phase output of the three-phase inverter and the three-phase direct current motor, the sixth wire being formed from a material containing copper,
the external resistance is inserted between the first phase output of the three-phase inverter and the three-phase direct current motor, in series with the first resistance, and
the current detection circuit calibrates the second current detection value and the third current detection value on a basis of a relation between the specific current detection value based on the voltage drop of the external resistance and the voltage drop of the first resistance.