Abstract: A motor driver drives a motor that controls a position of an object based on a command from a controller. The motor driver includes: a correction command output part that outputs a correction command for correcting a position of the motor based on a position of the object detected by a displacement sensor that detects the position of the object; and a position controller that outputs a drive signal for driving the motor based on the command from the controller and the position of the motor detected by an encoder that detects the position of the motor, or based on the correction command and the position of the motor detected by the encoder.

Abstract: A motor control device includes an instruction position detector that calculates, as an instruction position detection value, a position detection value at an external instruction timing. The instruction position detector includes an internal counter, a detection position calculator, and a correction value generator. The internal counter outputs a count value counted at a cyclic interval shorter than a position read cycle that is an interval at which a motor position detected by a rotary encoder mounted on a motor is read as a position detection value. The detection position calculator controls a rotation of the motor by use of the position detection value, is supplied with an external detection instruction signal including an instruction pulse, and calculates the instruction position detection value by use of a count value at the external instruction timing indicated by an edge of the instruction pulse.

Abstract: In a customization method of a motor control device, a customization module for executing a modifying operation of a specific function in a customizing element is formed. A customization module group is configured by a set of customization modules. The user can form a user module for executing an operation related to the specific function in the customizing element. A buffer memory accessible from both the customization module and the user module is provided. The customization module is configured to execute the operation related to the specific function based on data received from the user module via the buffer memory.

Abstract: In a customization method of a motor control device, a customization module for executing a modifying operation of a specific function in a customizing element is formed. A customization module group is configured by a set of customization modules. The user can form a user module for executing an operation related to the specific function in the customizing element. A buffer memory accessible from both the customization module and the user module is provided. The customization module is configured to execute the operation related to the specific function based on data received from the user module via the buffer memory.

Abstract: A hydraulic control circuit system comprises first and second double-acting cylinders, a hydraulic pump for supplying the double-acting cylinders with pressure oil, and directional control valves respectively associated with the cylinders for controlling the supply of pressure oil to the latter. The hydraulic control circuit system has a circuit for independently operating the individual cylinders and also a circuit for causing the rod advancing and retracting actions of the first cylinder to be followed by the rod advancing and retracting actions of the second cylinder. The system is applied to the hydraulic control circuit of, e.g., a front loader for controlling a hydraulic cylinder used for lifting and lowering the loader arm and another hydraulic cylinder used for turning the bucket pivotally connected to the free end of the arm.

Abstract: A speedup device for reciprocating cylinders which make use of fluid pressure such as hydraulic pressure or pneumatic pressure. The speedup device incorporates a poppet valve adapted to be moved for valving upon application of fluid pressure and is installed in a pipe line connecting a control valve to the front and rear chambers of a cylinder, the arrangement being such that when the rod of the reciprocating cylinder is to be extended, all the return from the front cylinder chamber flows into the rear chamber, thereby speeding up the extension of the rod of the reciprocating cylinder.