A sucker rod pump automated control method comprising measuring the sucker rod pump parameters, counting the sucker rod pump geometry, forming a dynamometer card of the sucker rod pump parameters. Measuring an angle of the sucker rod pump walking beam, and based on the walking beam angle value, forming a real time value of the sucker rod pump crank angle and a polished rod velocity with using geometry dependences of the sucker rod pump components. The walking beam is equipped with an angle sensor connected to a PC input and is formed to detecting position of the walking beam.

A motor drive and method to control a motor in a fluid system. The method may comprise determining a pressure; determining a proportional error as a limited difference between the pressure and a pressure setpoint; determining an integral step as a limited proportional error; determining an integral error as a limited sum of the integral step and a preceding unbound integral error; determining an error as the product of the integral error, the proportional error, and a gain factor; and generating a control signal to cause the inverter to output a motor voltage to drive the motor and maintain the pressure about the pressure setpoint.

A motor/pump assembly for a brake system includes at least one fluid pump arranged in a pump housing, an electric motor having a motor shaft configured to drive the fluid pump, a control unit arranged on the pump housing and configured to set a current rotational speed and/or a current torque of the motor, and a sensor arrangement having a measured value transmitter arranged within the pump housing and a magnetic measured value pickup stationarily arranged in the control unit. The control unit is further configured to detect contactlessly a current rotational angle of the shaft via the sensor arrangement, and to evaluate the angle to control the motor. The transmitter, in accordance with a rotary motion of the shaft, is configured to influence at least one magnetic variable of a magnetic field detected by the pickup.

A processing chamber is connected to a lock chamber. For evacuating the lock chamber and/or the processing chamber a vacuum pump system is provided. The latter comprises a vacuum pump equipment having at least one vacuum pump. Further, the vacuum pump system comprises a valve device for connection to the lock chamber as well as a controller. For noise reduction, a cyclically occurring operating parameter is determined by means of the controller. From said parameter it is determined at which point in time the valve is opened such that temporally before the opening of the valve the rotational speed of at least one of the vacuum pumps can be reduced. This results in a considerable noise reduction at continuing good pump-out times.

The purpose of the present invention is to provide an air compressing apparatus capable of establishing a sufficient air-filling rate while reducing noise at the initiation of operations. To solve this problem, in the present invention, the air compressing apparatus comprises a compressor body that compresses air, a motor that drives the compressor body, an inverter that controls the rotation speed of the motor, a control circuit connected to the inverter, and a pressure sensor that detects the pressure of air compressed in the compressor body, wherein the control circuit controls operation of the compressor body by operating at a low speed activation mode that operates the compressor body at a low speed rotational frequency lower than a maximum rotational speed when the air compressing apparatus is activated, and on the basis of a pressure value detected by the pressure sensor and elapsed time from activation, switching from the low speed activation mode to a normal operating mode that operates at variable frequencies including a maximum rotational frequency.

A hydraulic power unit has a housing, at least one pump element, a pressure collecting plate and an electric motor. The electric motor has at least one end shield, a stator and a rotor fixed on a rotor shaft. The at least one end shield has at least one partially circumferential functional recess extending between an outer and an inner circumferential surface of the end shield in the direction of a rotor shaft bearing seat. The functional recess thus formed permits the arrangement of functional elements at a central point of the hydraulic power unit in a space-efficient manner without negatively influencing the overall size of the hydraulic power unit.

A pump control system and an operating method thereof are disclosed. The pump control system includes a pump; a motor mechanically connected to the pump; a motor driving controller electrically coupled to the motor, the motor driving controller configured to control a speed of the motor; a current detection unit electrically coupled between the motor and the motor driving controller or electrically coupled to a power supply input interface of the pump control system; and a main controller electrically coupled to the motor driving controller.

A motor control device according to the disclosure includes: a current control part, performing current control for rotating a motor from a stop state; a rotation speed calculation part, calculating an actual rotation speed of the motor; an acquisition part, acquiring a target rotation speed of the motor; a speed control part, performing speed control of the motor, so that the actual rotation speed of the motor becomes the target rotation speed; and a correction part, at a time when a current control state is transitioned to a speed control, correcting the target rotation speed based on a relation between the actual rotation speed and the target rotation speed. When the target rotation speed is corrected, the speed control part performs the speed control so that the actual rotation speed becomes the target rotation speed corrected by the correction part.

A method controls the start-up of an oil pump of a gearbox by a brushless electric motor that has no position sensor. The stator coils are powered from the off mode in a constant-current open-loop control sequence until the pump reaches a speed threshold at which speed regulation switches over to closed-loop control on a setpoint corresponding to the lubrication flow rate required to ensure the reliability of the gearbox, but without in so doing exceeding a current threshold indicative of pump seizure, at which point motor control switches back over to the constant-current open-loop control sequence. The open-loop current setpoint is higher than the threshold for switching over to closed-loop control so that in the open-loop control mode the motor torque available at the pump is higher than in the closed-loop control mode.

The disclosure relates to a three-stage reciprocating compressor comprising pistons and suction and compression chambers in which a medium is compressed for each separate stage, which stages are connected in series and where a first stage is fluidly connected to an inlet for inlet of uncompressed or pre-compressed gas where the three-stage pistons move synchronously along a common axis in one connected unit such that the first and second stage suction and compression chambers share piston as well as cylinder wall, and having separate cylinder heads, a top headpiece and a bottom headpiece on each side of the piston, the third stage piston extending from a center of the first and second stage common piston and is passed through an opening in the cylinder head of the first stage suction and compression chamber, in extension of which is placed a third stage cylinder tube with a smaller diameter than a diameter of the cylinder for stage one and two, each stage fluidly separated by one or more one way valves, where the second stage suction and compression chamber is formed between the cylinder wall and a piston skirt as well as between an underside of the piston and the headpiece placed in a bottom of the cylinder.