摘要:
A method of controlling a DC servomotor for driving a driven member coupled by a wire to an operation member of a valve, wherein, at the start of a control, the motor is driven first to rotate the operation shaft of the valve to a limit position after the motor stops, a driving current of the motor is gradually reduced to return slowly the driven member by a tension of the wire, and a position of the driven member when the driving current of the motor becomes zero is stored as a final stop position, thereafter, a rotational range of the driven member is limited to the range between these final stop positions when the position of the driven member is controlled to coincide with a target position.
摘要:
The invention concerns a control system for a d.c. motor (10), powered by an actuating system (14) comprising: a position detector (30, 32) co-operating with the motor's rotor; a power supply circuit (34) to apply to the terminals of the motor coils a supply voltage to generate the electric current, and a control circuit (36). This system is designed to actuate the motor to move a moving part (24), with a view to reaching a target position Pc defined by a number of steps dc to be executed. During a so-called positioning phase, the control circuit (36), after observing that target position Pc has been reached, interrupts the current powering the coils and applies to them a braking pulse (If) of reverse polarity, then short-circuits them until stoppage observed by the detector (30, 32).
摘要:
The invention reduces the oscillation of the rotation speed regulator when stationarynulldespite low position resolution and a high minimum rotation speed resulting from thisnullby switching the closed-loop control structure, when the drive is moved into the nominal position, in which case the closed-loop control structure does not need to include a current regulator when stationary. The control voltage is predetermined directly by the rotation speed regulator (2null), which is in the form of a pure P-regulator. If the rotor is deflected, then dynamic negative feedback is carried out by differentiation (9) of the position (null). The position control loop (1null), which is at a higher level than the rotation speed control loop (2null), is in the form of a PI regulator in order that no permanent position errors can occur. The switching of the closed-loop control structure according to the invention is achieved by producing characteristics which are optimized as a function of the state, namely high dynamics during movement and a good unmoving position when stationary.
摘要:
A method for determining accuracy of an actual position of a plurality of independent motors in a printing press is provided. The method includes commanding each of the plurality of motors in the printing press via a controller to move a desired initial position, comparing an actual position of each motor to the desired initial position of each motor, determining if the actual position of each motor is within a predetermined tolerance of the desired initial position, and resetting any motor outside the predetermined tolerance to be within the predetermined tolerance. A printing press is also provided. The printing press includes a plurality of printing press components and a plurality of motors. Each motor drives at least one of the printing press components and each of the motors has a desired initial position. The printing press also includes a position detector for determining an actual position of the motor with respect to the desired initial position of the motor.
摘要:
Provided is a technique to suppress hunting in a range of a minimum resolution of a pulse encoder when a servo motor has reached a target position and stopped, thereby maintaining a stable stop state. A servo motor position control device uses a cascade configuration having a position control loop as a main loop and a velocity and current control loop as a minor loop. A proportion control is performed for a position control while a proportion integration control is performed for a velocity control and a current control. When the servo motor position has reached the target position and stopped (S201), a current instruction value for the current control is maintained at a value upon stop (S202) and the current control is switched to the proportion control (S204).
摘要:
The method of locating a servo motor controller's position of the present invention utilizes accrual calculation method to ensure the positions of motor controller at each station of the production line is correctly obtained, wherein the last digit of the gear ratio is utilized to obtain a critical value so that the inputted pulse value and the gear ratio are be calculated to result a quotient and a remainder. The remainder is compared with the critical value first in order to determine the following processes of the quotient, the remainder and the last digit of gear ratio. The quotient and the remainder are stored in the quotient temporary storage device and remainder temporary storage device respectively to ensure the actual pulse value of the motor will not be cumulated with the position calculating errors.
摘要:
A motor control device comprises: a motor control unit; and a signal output unit, wherein the motor control unit controls a motor based on an output signal of the signal output unit, wherein the motor control unit is configured to function as: a first control unit performs a first motor control, in which a current upper limit is estimated based on a rotation speed of the motor and is input to the motor, a second control unit performs a second motor control, in which a second driving current, which is a driving current lower than the first driving current at the end of the first motor control is input, a third control unit performs a third motor control, in which a third driving current to be input to the motor is determined, and a switching unit that sequentially switches the first, second, and third control units.
摘要:
An encoder 13 determines the remaining travel distance of a stacker crane to perform deceleration control. When a linear sensor 8 determines an absolute distance from the stop position, the linear sensor 8 performs deceleration control, and when a mark sensor 26 detects a mark 36, the mark sensor 26 performs stop control. Likewise, deceleration control is performed based on the remaining elevation distance determined by an encoder 19. When a linear sensor 9 determines an absolute distance from the stop position, the linear sensor 9 performs deceleration control, and when the mark sensor 26 detects the mark 36, the mark sensor 26 performs stop control.
摘要:
The invention is a system for controlling the position of a movable member moved by a prime mover by monitoring the position of the movable member; generating position information based upon this monitoring; and controlling the prime mover based upon the position information by providing a counter force to the movable member substantially equal to an opposing force opposing the movement of the movable member. The invention may include a movable member, such as a ram used for fastening a terminal to a wire; a spring; a DC planetary gear motor for providing a force to the movable member opposing the spring; a position detector, such as an linear voltage displacement transducer, to detect the position of the movable member and generate position information; and a controller, which may include a logic board or microprocessor and memory, for controlling the force from the motor in response to the position information.