Patent application number | Description | Published |
20150194921 | MOTOR CONTROL DEVICE CAPABLE OF SWITCHING BETWEEN APPLICATION AND NON-APPLICATION OF MAGNETIC FLUX CONTROL - A motor control device that controls an exciting current and a torque current separately from each other, and drives an induction machine includes: a first exciting current command generating unit that generates a first exciting current command in accordance with a speed and torque command; a second exciting current command generating unit that includes a magnetic flux control unit generating a second exciting current command by using a difference between a first exciting current command and a magnetic flux estimation value, and a magnetic flux estimating unit generating a magnetic flux estimation value from the second exciting current command, the second exciting current command generating unit outputting a second exciting current command; and a switching unit that selects one of a first exciting current command and a second exciting current command in accordance with a control mode or external information. | 07-09-2015 |
20150309500 | MOTOR CONTROLLER FOR PERFORMING CORRECTION WHEN DIRECTION OF ROTATION IS REVERSED - A motor controller is configured to judge whether or not the amount of displacement of a driven body after the direction of movement of the driven body is reversed, exceeds a predetermined threshold value, and whether or not the amount of displacement of a motor after the direction of movement of the motor is reversed, exceeds another predetermined threshold value. When the amount of displacement of the driven body exceeds the threshold value, or the amount of displacement of the motor exceeds a second threshold value, the correction of the commands to the motor is terminated. | 10-29-2015 |
20150355627 | MOTOR CONTROL SYSTEM AND MOTOR CONTROL METHOD WHICH PROTECT TOOL AND WORKPIECE AT TIME OF POWER OUTAGE - A motor control system which makes a tool motor and a workpiece motor rotate in synchronization in a machine tool equipped with a tool motor, a workpiece motor, and a tool shaft movement motor which drives a linear shaft to change an intershaft distance between the tool shaft and the workpiece shaft, wherein when the power outage detector detects a power outage of the power supply during synchronous rotation of the tool motor and the workpiece motor, the operation of the forced deceleration circuit for causing forced deceleration of either one of the tool motor and workpiece motor is made to be delayed by a predetermined time and during that time the tool shaft movement motor is used to drive the linear shaft and separate the tool and workpiece as a retraction operation to thereby prevent damage to the tool and the workpiece at the time of a power outage. | 12-10-2015 |
Patent application number | Description | Published |
20150212496 | SERVOMOTOR CONTROL DEVICE AND PRODUCTION SYSTEM EQUIPPED WITH THE CONTROL DEVICE - A servomotor control device includes a servomotor control circuit for controlling an inverter such that an alternating current is supplied to a servomotor when receiving a safety signal, and for controlling the inverter such that the alternating current is not supplied to the servomotor when not receiving the safety signal, and a servomotor monitoring circuit for stopping the servomotor by stopping transmission of the safety signal to the servomotor control circuit when determining to stop the servomotor, and for stopping the servomotor by disconnecting supply of a direct current to the inverter with a power source disconnect circuit and stopping the transmission of the safety signal to the servomotor control circuit when determining that at least one of the power source disconnect circuit, the safety signal, and the servomotor control circuit is not normal. | 07-30-2015 |
20150316111 | BRAKE DRIVE CONTROL DEVICE PROVIDED WITH ABNORMALITY DETECTION FUNCTION - A brake drive control circuit of a servo motor which detects malfunction of a semiconductor circuit at the brake drive control circuit, that is, a brake drive control circuit which connects two semiconductor circuits in series to a brake and uses a voltage detection circuit which detects the presence of voltage which is applied to the brake by brake signals turning the semiconductor circuits on/off so as to detect test pulses in the voltage which is applied to the brake due to test pulses which are included in the brake signals and turn the semiconductor circuits off for instants during an operation for disengaging the brake and detect malfunctions of the semiconductor circuits by the detection of the test pulses. | 11-05-2015 |
20150343636 | ROBOT CONTROLLER INTEGRALLY FORMED WITH AMPLIFIER - A robot controller comprises a control unit which outputs a driving command of a servo motor for robot driving, and an amplifier unit which outputs a driving signal to the servo motor in response to the driving command from the control unit. The control unit and the amplifier unit are mounted in integrally formed printed boards and are connected so as to be able to communicate with each other via the printed boards. | 12-03-2015 |