LOAD TORQUE ESTIMATION APPARATUS, IMAGE FORMING APPARATUS, LOAD TORQUE ESTIMATION METHOD AND NON-TRANSITORY COMPUTER-READABLE INFORMATION RECORDING MEDIUM

摘要

A load torque estimation apparatus inputs a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model to estimate load torque of the electric motor; and derives a mechanical time constant of the electric motor corresponding to the load torque estimated by the estimation part. The load torque estimation apparatus updates the mechanical time constant included in the model by using the mechanical time constant corresponding to the load torque estimated at an (n−1)th control period (where n denotes an integer greater than or equal to 2) and estimates the load torque of the electric motor at an nth control period by inputting the controlling value and the actually measured value acquired at the nth control period to the model acquired through the updating.

主权项

1. A load torque estimation apparatus for estimating load torque of an electric motor, the load torque estimation apparatus comprising:
an estimation part configured to input a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model to estimate load torque of the electric motor; and a derivation part configured to derive a mechanical time constant of the electric motor corresponding to the load torque estimated by the estimation part, wherein the estimation part is configured to update the mechanical time constant included in the model by using the mechanical time constant corresponding to the load torque estimated at an (n−1)th control period (where n denotes an integer greater than or equal to 2) and estimate the load torque of the electric motor at an nth control period by inputting the controlling value and the actually measured value acquired at the nth control period to the model acquired through the updating.