Abstract:
A compound planetary gear mechanism includes at least two planetary gear mechanisms and a carrier. The at least two planetary gear mechanisms include a first planetary gear mechanism and a second planetary gear mechanism. The first planetary gear mechanism includes a plurality of first planetary gears. The second planetary gear mechanism includes a plurality of second planetary gears. The carrier is coupled to the plurality of first planetary gears and the plurality of second planetary gears. The carrier includes a first support shaft and a second support shaft. The first support shaft rotatably supports a first planetary gear among the plurality of first planetary gears. The second support shaft rotatably supports a second planetary gear among the plurality of second planetary gears and is independent of the first support shaft.
Abstract:
A motor drive system is provided with a motor, a torque sensor provided between the motor and a load, and a circuitry that controls driving of the motor. The circuitry is configured to execute estimating at least either of a speed or a position of the motor based on a torque detection signal detected by the torque sensor.
Abstract:
A motor control apparatus according to an embodiment includes a torque current controller, an excitation current controller, and an estimation unit. The torque current controller that performs torque current control on a motor based on a deviation between a feedback signal based on a detection result of a sensor that can detect torque or acceleration of the motor and a torque current reference. The excitation current controller that performs excitation current control on the motor based on an excitation current reference on which a high-frequency current reference is superimposed. The estimation unit that estimates at least one of a position and a velocity of the motor based on the deviation and the high-frequency current reference.
Abstract:
A parallel mechanism includes a fixed plate, four turnable actuators, four peripheral driving mechanisms, and a movable plate. The four turnable actuators are disposed in respective four directions of the fixed plate with pivot axes of two adjacent turnable actuators being orthogonal to one another and with pivot axes of two opposing turnable actuators being parallel to one another. The four peripheral driving mechanisms each include an upper arm made up of a bar integral with a rotor of a turnable actuator corresponding to the upper arm. An upper joint couples the upper arm to the lower arm. A lower joint couples the lower arm to the movable plate. The movable plate is driven by the four turnable actuators through the four peripheral driving mechanisms with at least four degrees of freedom including one rotational degree of freedom along a plane direction of the movable plate.