US Patent No. 10,840,848

MOTOR DRIVER AND MOTOR DRIVING SYSTEM


Patent No. 10,840,848
Issue Date November 17, 2020
Title Motor Driver And Motor Driving System
Inventorship Kai Fukuda, Yamanashi (JP)
Ryou Matsuda, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 10,840,848

1. A motor driver that is accommodated in a housing and drives a motor, the motor driver comprising:a storage unit that stores a quantity of heat generated independently of a value of a current caused to flow in the motor as a first heat quantity;
a current detection unit that detects the value of the current caused to flow in the motor; and
a heat quantity calculation unit that calculates a quantity of heat released to an interior of the housing by adding the first heat quantity stored in the storage unit and a second heat quantity responsive to the value detected by the current detection unit, wherein
the storage unit stores a ratio of the quantity of heat released to the interior of the housing to a quantity of heat generated according to the value of the current caused to flow in the motor, and
the heat quantity calculation unit calculates the second heat quantity by multiplying a heat quantity responsive to the value detected by the current detection unit by the ratio stored in the storage unit.