Robot system
AssigneeDenso Wave Incorporated
InventorHideyuki Nishino
Life of this patent
Estimating the term…
Abstract
A robot system includes: a robot; a three-phase inverter having a high side switch and a low side switch connected in series; a power line electrically connecting a connection point between the high side switch and the low side switch to a stator winding of a motor; a short circuit path that electrically connects at least two lines of the power line; a brake switch arranged in the short circuit path to change the short circuit path to an open state or a closed state; a break detector that detects a disconnection of the power line; and an operation part that operates the brake switch from the open state to the closed state, when the break detector detects the disconnection.
Claims9
A robot system comprising:
- a robot including
- a base portion,
- a plurality of rotation parts connected rotatably relative to the base portion, and
- a three-phase motor arranged to drive a rotation shaft of the respective rotation part;
- a three-phase inverter having a high side switch and a low side switch connected in series;
- a three-phase power line electrically connecting a connection point between the high side switch and the low side switch to a stator winding of the motor, the power line connecting the inverter and the stator winding through a lead-in port of the base portion;
- a short circuit path that electrically connects at least two lines of the three-phase power line, the short circuit path being located between the stator winding and the lead-in port;
- a brake switch arranged in the short circuit path to change the short circuit path to an open state or a closed state;
- a break detector that detects a disconnection of the power line;
- and
- an auxiliary switch that operates the brake switch from the open state to the closed state, when the break detector detects the disconnection.
Dependencies are inferred from the claim text.