Motor control device
AssigneeMitsubishi Electric Corporation
InventorsJun Yoshida, Akira Tanabe, Kazuaki Ando
Life of this patent
Estimating the term…
Abstract
Motor drive information is sampled at a regular interval and stored in a storage unit, during a period when a normal operation is performed in accordance with a first command signal received from a controller. When an abnormality occurs, a second command signal with which a motor can be driven is internally generated from the motor drive information stored in the storage unit. When the abnormality occurs, the internally-generated second command signal is input as a command signal to a motor drive unit, and thereby it is possible to achieve a necessary retracting operation without any problem even if the first command signal cannot be obtained from the controller.
Claims7
A motor control device comprising:
- a motor drive unit configured to drive a motor to follow a command signal to be input;
- an abnormality detection unit configured to monitor whether or not an abnormality such as an electric power failure that disables normal driving of the motor occurs;
- a command switching unit configured to input, when the abnormality detection unit does not detect the abnormality, a first command signal received from a controller as the command signal to the motor drive unit, and to input, when the abnormality detection unit detects the abnormality, a second command signal generated within the motor control device as the command signal to the motor drive unit;
- a storage unit configured to sample, when the abnormality detection unit does not detect the abnormality, motor drive information in the motor drive unit at an arbitrarily-set regular interval and stores therein the sampled motor drive information;
- and
- a command generation unit configured to read, when the abnormality detection unit detects the abnormality, a predetermined number of pieces of the motor drive information in order of time from occurrence of the abnormality to past from the storage unit to generate the second command signal that causes a retraction path tracing back a trajectory of the motor from a time of the occurrence of the abnormality.
A motor control device comprising:
- a motor drive unit configured to drive a motor to follow a command signal to be input;
- an abnormality detection unit configured to monitor whether or not an abnormality such as an electric power failure that disables normal driving of the motor occurs;
- a command switching unit configured to input, when the abnormality detection unit does not detect the abnormality, a first command signal received from a controller as the command signal to the motor drive unit, and to input, when the abnormality detection unit detects the abnormality, a second command signal generated within the motor control device as the command signal to the motor drive unit;
- a storage unit configured to store and overwrite, when the abnormality detection unit does not detect the abnormality, an arbitraily-set retraction position that is output from the controller along with the first command signal;
- and
- a command generation unit configured to read, when the abnormality detection unit detects the abnormality, the retraction position from the storage unit to generate the second command signal that causes a retraction path whose target position is the read retraction position.
Dependencies are inferred from the claim text.