Driving apparatus and driving system for electric motor
First Claim
1. An apparatus for controlling drive of an electric motor comprising:
- a current detecting means for detecting a current flowing through an externally connected electric motor;
a controlling means for generating a control signal to control the electric motor according to the current detected by a current detecting means and a speed command value for specifying the rotational speed of the electric motor; and
a load estimating means for estimating a load condition from a load power corresponding to a mechanical load condition associated with the electric motor, said load power being calculated on the basis of both the current value detected by the current detecting means and the speed command value,wherein;
the controlling means further comprises speed compensating means for compensating the speed command value based on the estimated load condition, andthe controlling means controls the electric motor with the control signal generated on the basis of the detected current value and the compensated speed command value.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for controlling the drive of an electric motor, having a current detector for detecting the current through an externally connected electric motor; a controller for generating a control signal to control the electric motor on the basis of the current detected by the current detector and the speed command for specifying the rotational speed of the electric motor; wherein the apparatus includes a load estimator for estimating the mechanical load condition associated with the electric motor on the basis of the current detected by the current detector and the speed command, and the controller controls the electric motor current on the basis of the detected current, the speed command and the estimated load condition.
20 Citations
5 Claims
-
1. An apparatus for controlling drive of an electric motor comprising:
-
a current detecting means for detecting a current flowing through an externally connected electric motor; a controlling means for generating a control signal to control the electric motor according to the current detected by a current detecting means and a speed command value for specifying the rotational speed of the electric motor; and a load estimating means for estimating a load condition from a load power corresponding to a mechanical load condition associated with the electric motor, said load power being calculated on the basis of both the current value detected by the current detecting means and the speed command value, wherein; the controlling means further comprises speed compensating means for compensating the speed command value based on the estimated load condition, and the controlling means controls the electric motor with the control signal generated on the basis of the detected current value and the compensated speed command value. - View Dependent Claims (2, 3, 4)
-
-
5. An electric motor driving system comprising
an electric motor; -
a power converter for generating the motor current to flow through a electric motor; a current detecting means for detecting the motor current; a controlling means for generating the control signal to control the electric motor according to the current detected by a current detecting means, and a speed command value to command a rotational speed of the electric motor; and a load estimating means for estimating a load condition from a load power corresponding to a mechanical load condition imposed on the electric motor, said load power being calculated on the basis of the electric motor current and the speed command value, and wherein; the controlling means further comprises speed compensating means for compensating the speed command value based on the estimated load condition, and the controlling means controls the electric motor with the control signal generated on the basis of the detected current values and the compensated speed command value.
-
Specification