Kabushiki Kaisha Yaskawa Denki

Shigenori Takayama

Keisei Inoki

Michiharu Tanaka

Satoshi Sueshima

A power conversion apparatus includes a power converter to directly convert AC power having a frequency into AC power having a different frequency. A gate driver drives the power converter. A gate drive signal generator generates a gate drive signal supplied to the gate driver. Two cutoff devices are coupled between the gate driver and the gate drive signal generator, and supply or cut off the gate drive signal to the gate driver based on a command from an external apparatus. At least one of the two cutoff devices generates a feedback signal. An analyzer determines whether the one cutoff device has an abnormality based on the command and the feedback signal. A cutoff controller controls another one of the two cutoff devices to cut off the gate drive signal to the gate driver when the analyzer determines that the one cutoff device has the abnormality.

Power conversion apparatus and method for analyzing for abnormality in power conversion apparatus having cutoff devices

Since a release voltage to a brake is applied by a plurality of series-connected contacts and at least one contact is a normally open contact of a relay for controlling a driving power supply of a motor, a control apparatus having a high safety characteristic for an industrial-purpose robot is provided, while even when fusion of a contact happens to occur, the control apparatus can firmly interrupt the application of the release voltage to the brake. Also, the control apparatus for the industrial-purpose robot is provided which need not be equipped with a power supply for releasing the brake by an operator in a manual manner. To this end, in a control apparatus of an industrial-purpose robot () equipped with an electromagnetic type brake () which locks a shaft of a motor, the control apparatus is provided with a first relay contact () which is closed when the electromagnetic type brake () is released, and a second relay contact () which is closed when driving electric power is supplied to the motor; and the first relay contact (), the second relay contact (), and the electromagnetic type brake () are series-connected to a drive-purpose power supply () of the electromagnetic type brake ().

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Kitakyushu, Japan

Shigenori Takayama