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

Claim 5:
6. 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 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 third resistance, when the second current is zero, and
calibrates the second 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 second resistance, when the third current is zero.