Estimation device for estimating drive state of electric motor disposed in machine tool
AssigneeFanuc Corporation
InventorsYohei KAMIYA, Kazunori IIJIMA
Life of this patent
Estimating the term…
Abstract
This estimation device comprises a calculation unit that calculates variables indicating the drive state of an electric motor of a machine tool on the basis of a simulation program. The simulation program is a program in which a first auxiliary variable relating to a load factor for estimating the drive state of the electric motor is added to a command statement of a machining program for driving the machine tool. The calculation unit calculates changes in the speed of the electric motor over time on the basis of output characteristics of the electric motor, inertia related to driving of the electric motor, and the first auxiliary variable.
Claims8
An estimation device configured to estimate a drive state of an electric motor disposed in a machine tool, the estimation device comprising:
- a calculation unit configured to calculate a variable indicating the drive state of the electric motor, in accordance with a simulation program created in advance, wherein
- the electric motor is an electric motor in which time until a target rotation speed is reached when a rotational speed of the electric motor is changed is not determined,
- the simulation program includes a command statement in which a first auxiliary variable related to a load factor for changing the rotation speed of the electric motor is added to a command statement of a machining program for driving the electric motor when a workpiece is machined, and
- the calculation unit calculates a change over time in the rotation speed of the electric motor on the basis of an output characteristic of the electric motor, a predetermined inertia related to driving of the electric motor, and the first auxiliary variable.
An estimation device configured to estimate a drive state of an electric motor disposed in a machine tool, the estimation device comprising:
- a calculation unit configured to calculate a variable indicating the drive state of the electric motor, in accordance with a simulation program created in advance, wherein
- the electric motor is an electric motor in which time until a target rotation speed is reached when a rotational speed of the electric motor is changed is determined,
- the simulation program includes a command statement in which an auxiliary variable related to a load factor for machining a workpiece is added to a command statement of a machining program for driving the electric motor, and
- the calculation unit calculates a change over time in the load factor of the electric motor on the basis of the time until the rotation speed of the electric motor reaches the target rotation speed, an output characteristic of the electric motor, a predetermined inertia related to driving of the electric motor, and the auxiliary variable.
Dependencies are inferred from the claim text.