摘要:
An electric current control method for a servomotor in which a reactive current is lowered in a region where a voltage saturation does not occur, to suppress generation of heat caused by the reactive current and achieve a stable rotation up to a high-speed region. In the current control of the servomotor using a DQ conversion, an electric current is not supplied to d-phase and supplied only to q-phase when a rotational speed of the servomotor is not high, and the reactive current is supplied to the d-phase only when the rotational speed of the servomotor is high, to thereby lower the terminal voltage of the servomotor by the reactive current. Thus, the reactive current is reduced in the region where the voltage saturation does not occur, to thereby suppress the generation of heat due to the reactive current, and also achieve the stable rotation even in the high-speed region.
摘要:
A remote control system is employed with a view to realization of automated/unattended control in supervisory control of power equipment, transportion/traffic equipment, building equipment, home equipment, and the like. This remote control system includes a priority rank determination unit and a control unit on the controlled side where a control signal for controlling the operation of a plurality of electric equipment is inputted through a communication system from the control side. The priority rank determination unit determines an operating priority rank of respective electric equipments on the basis of respective power dissipations of the plurality of electric equipments. The control unit operates respective electric equipments on the basis of the operating priority rank thus determined. By controlling the operation of the electric equipment in this way, an accident of interruption of the operation of the entire system resulting from the operation of a specific electric equipment is prevented. Further, since this system judges in advance as to whether or not the operation of a specific electric equipment is proper, thus making it possible to prevent in advance the operation of an interrupter, etc., the supervisory control of the system is always maintained.
摘要:
A swash plate type compressor having axially spaced inlet chambers and outlet chambers located on the side of angularly spaced pistons having each side thereof pump chambers which are connected to inlet chamber when the medium is introduced into the pump chambers, and are connected to the outlet chamber when the medium is removed to the outlet chambers. A swash plate chamber is arranged inside the cylinder block and cooperates with the pistons via respective shoes for reciprocating the pistons in the respective cylinder bores. An inlet of the fluid to be compressed is opened to the swash plate chamber at a circumferential position along the inner wall of the swash plate chamber. Communication passageways for connection of the swash plate chamber with the inlet chambers are arranged on position spaced farthest from the inlet port. The flow of the lubrication oil contained in the gas to be compressed is generated inside the swash plate chamber and comes into contact with all of the shoes, to lubricate same, before being introduced into the communication passageway from the swash plate chamber.
摘要:
A thrust bearing assembly of a wobble plate type refrigerant compressor for supporting a non-rotatable inclined wobble plate on a rotatable drive element which rotates with a drive shaft, and having a inclined drive face able to convert a rotating motion of the drive element into a wobbling motion of the wobble plate to thereby cause a reciprocation of compression pistons in cylinder bores, the thrust bearing assembly having a plurality of roller elements, an annular retainer elements holding the roller elements therein and rotating in a space between the drive face of the drive element and an inclined face of the wobble plate confronting the drive face, a pair of race elements attached to the drive and inclined faces of the drive element and the wobble plate to provide raceways for rolling of the roller elements, and a circumferentially extended guide way element supplying the annular retainer elements with a constant slide guide during the operation of the compressor irrespective of a change in the operating speed and compression ratio of the compressor.
摘要:
In a coin processing machine wherein coins from a turntable are sent in succession through a coin passageway to a processing position, a pair of coin guides at least one of which is adjustable by a first control member are arranged on opposite sides of the coin passageway thus defining the width variable of the coin passageway, a residual coin detecting device comprises an electric driving unit driving the first control member and also a second control member in accordance with a selected one of a plurality of selectable denominations of coins set in the machine, and a residual coin detecting member controlled by the second control member in vertical movements between the coin guides prior to the adjustment of the movable coin guide by the first control member, so that coins incidentally remaining in the coin passageway are detected by the coin detecting member.