Robot system
AssigneeDenso Wave Incorporated
InventorHideyuki Nishino
Life of this patent
Estimating the term…
Abstract
A robot system includes a motor, an inverter, a first control portion, and a second control portion. The motor includes stator windings for three phases. The inverter includes series-connection bodies of a high-side switch and a low-side switch for three phases. A connection point of the high-side switch and the low-side switch for each of the phases is connected with the corresponding stator winding. One of the high-side switch and the low-side switch for each of the phases works as a brake switch. The first control portion and the second control portion performs a driving control of the brake switches. Each of the first control portion and the second control portion has a function of monitoring the robot system, and turns on the brake switches for at least two phases when detecting that an abnormality occurs in the robot system.
Claims7
A robot system comprising:
- a motor including stator windings for three phases and driving each rotation axis of a robot;
- an inverter including series-connection bodies of a high-side switch and a low-side switch for the three phases, and alternately turning on the high-side switch and the low-side switch to apply an alternating-current voltage to the corresponding stator winding using an external power source as a power supply source, a connection point of the high-side switch and the low-side switch for each of the phases being connected with the corresponding stator winding, one of the high-side switch and the low-side switch for each of the phases working as a brake switch;
- and
- a first control portion and a second control portion performing a driving control of the brake switches, each of the first control portion and the second control portion having a function of monitoring the robot system, and each of the first control portion and the second control portion turning on the brake switches for at least two phases when detecting that an abnormality occurs in the robot system, wherein
- each of the first control portion and the second control portion has a function of monitoring an abnormality in each other,
- the first control portion turns on the brake switches for at least two phases when detecting that an abnormality occurs in the second control portion, and
- the second control portion turns on the brake switches for at least two phases when detecting that an abnormality occurs in the first control portion.
Dependencies are inferred from the claim text.