Protection device
AssigneeFanuc Corporation
InventorsYudai Konaka, Kenji Kawai
Life of this patent
Estimating the term…
Abstract
A protection device provided between a synchronous motor having a plurality of windings and a motor driving device for driving the synchronous motor includes: a switching unit for making and breaking the connection between the motor driving device and the synchronous motor; a dynamic brake circuit including resistors and switches, to short-circuit the plurality of windings between the switching unit and the synchronous motor via the resistors; and a control device for controlling the switching unit and the dynamic brake circuit. The control device controls the switches in the dynamic brake circuit to short-circuit the plurality of windings, and then controls the switching unit to cut off the connection between the motor driving device and the synchronous motor.
Claims15
A protection device provided between a synchronous motor having a plurality of windings and a motor driving device for driving the synchronous motor, comprising:
- a switching unit configured to make and break the connection between the motor driving device and the synchronous motor;
- a dynamic brake circuit, arranged between the switching unit and the synchronous motor, including resistors and switches, and configured to short-circuit the plurality of windings via the resistors;
- and
- a control device configured to control the switching unit and the dynamic brake circuit, wherein the control device is configured to control the switches in the dynamic brake circuit to short-circuit the plurality of windings, and then control the switching unit to cut off the connection between the motor driving device and the synchronous motor.
A protection device provided between a synchronous motor including a plurality of windings and a motor driving device for driving the synchronous motor, the protection device comprising:
- a first switch configured to connect or disconnect between the motor driving device and the synchronous motor;
- a dynamic brake circuit, arranged between the first switch and the synchronous motor, including a plurality of resistors and a plurality of second switches, and configured to short-circuit the plurality of windings of the synchronous motor via the plurality of resistors;
- and
- a control device configured to control the first switch and the dynamic brake circuit, wherein the control device is configured to control the plurality of second switches to provide a selection of resistance from the plurality of resistors in the dynamic brake circuit to short-circuit the plurality of windings of the synchronous motor, and then control the first switch to disconnect between the motor driving device and the synchronous motor.
A method for a protection device provided between a synchronous motor including a plurality of windings and a motor driving device for driving the synchronous motor, the method comprising:
- connecting or disconnecting between the motor driving device and the synchronous motor by a first switch;
- and
- short circuiting, by a dynamic brake circuit, the plurality of windings of the synchronous motor via a plurality of resistors, the dynamic brake circuit arranged between the first switch and the synchronous motor, including the plurality of resistors and a plurality of second switches,
- wherein the plurality of second switches are controlled to provide a selection of resistance from the plurality of resistors in the dynamic brake circuit to short-circuit the plurality of windings of the synchronous motor, and then the first switch is controlled to disconnect between the motor driving device and the synchronous motor.
Dependencies are inferred from the claim text.