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| Number | Title | Issue Date |
| 8133033 | High voltage bus capacitor pre-charger circuit A precharge circuit (20, 20′, 20″) charges at least one capacitor (22, 22′, 22″) associated with an electrical device with high capacitance, such as a motor (14) which drives a compressor (16) of the pneumatic system. One end of t... | 03/13/2012 |
| 7967573 | Method for driving a bidirectional motor to rotate a fluid circulation pump A method for starting a motor (14) with a bidirectional rotation direction, to rotate a fluid circulation centrifugal pump (10) having a predetermined optimum hydraulic efficiency depending on the starting rotation direction thereof. The method provide... | 06/28/2011 |
| 7621721 | Vacuum pumping device with electronic control of the motor An oil mechanical vacuum pump, which is equipped with an electric motor comprises an electronic control device for supplying the electric motor with power. The electronic control device comprises a frequency converter for controlling the excitation frequency Fe... | 11/24/2009 |
| 7534096 | Method and system for improving pump efficiency and productivity under power disturbance conditions A system for controlling operation of a progressing cavity pump to maintain the motor operating under power disturbance conditions. For a blackout condition, a backspin controller uses regenerative power to provide controlled deceleration of the pump, counteracting ... | 05/19/2009 |
| 7402977 | Apparatus and method for controlling operation of reciprocating motor compressor An apparatus for controlling an operation of a reciprocating motor compressor includes a current integrator for integrating an alternating current applied to a motor of the compressor during each one cycle thereof; and a controller for differently controlling a firi... | 07/22/2008 |
| 7362021 | Moisture-proof device for motor A moisture-proof device is provided to be used in a fan having a stator for isolating the stator from moisture. The moisture-proof device includes a first covering part for covering a circuit board of the stator of the motor, and a second covering part connected to ... | 04/22/2008 |
| 7352142 | Apparatus and method for controlling stroke of reciprocating compressor An apparatus for controlling an operation of a reciprocating compressor includes a voltage detecting unit for detecting a positive half-wave voltage of an AC voltage applied to a motor of the reciprocating compressor; a current detecting unit for detecting a positiv... | 04/01/2008 |
| 7348744 | Brushless DC motor drive apparatus A brushless DC motor drive apparatus for driving a rotor includes a drive circuit rotating the rotor, a current shutdown and auto-restart circuit coupled to the drive circuit, and a DC voltage comparison circuit coupled to the current shutdown and auto-restart circu... | 03/25/2008 |
| 7338260 | System and method for controlling current provided to a stepping motor A system and method is disclosed for controlling the input electrical current to an infusion pump stepper motor based on predetermined torque requirements. The system can include a motor controller and a non-volatile memory containing expected load torque values thr... | 03/04/2008 |
| 7321211 | Power variation control system for cyclic loads A method and apparatus for managing power demand of a motor in a cyclic load system having a rotational mass is provided. Flat power draw is achieved through continuous manipulation of the motor torque as a function of feedback velocity while using the rotational ma... | 01/22/2008 |
| 7311501 | Scroll compressor with bifurcated flow pattern A scroll compressor includes various features that promote a bifurcated flow pattern of gas through a compressor shell to reduce oil entrainment. After entering the shell, some gas travels upward, which reduces the volume of gas traveling downward toward an oil sump... | 12/25/2007 |
| 7309926 | Solar-powered pumping device A solar-powered pumping device comprising: a solar power converter for generating power from sunlight; a pump driven by power from said solar power converter; an actuator for controlling the orient... | 12/18/2007 |
| 7295638 | Communication device A direct sequence spread spectrum (DSSS) receiver (100) consistent with certain embodiments has a frequency generator (112) that generates a local oscillator signal without use of a piezoelectric crystal. A frequency converter (108) receives the... | 11/13/2007 |
| 7287966 | Fuel injector driver circuit with energy storage apparatus A reciprocating pump includes a drive section and a pump section. The drive section has a reciprocating coil assembly to which alternating polarity control signals are applied by a reciprocating circuit during operation. A permanent magnet structure of the drive sec... | 10/30/2007 |
| 7284956 | Methods and apparatus for controlling a continuous flow rotary blood pump A control system for a continuous flow rotary blood pump is provided. A normal operating range of the blood pump is established. The normal operating range may comprise a normal pump flow range and a normal pressure head range. A target rotational speed of the pump ... | 10/23/2007 |
| 7281903 | Device for varying the pressure of the fluid delivered by a jet washer Device for varying the delivery pressure of a jet washer comprising a positive-displacement pump operated by a single-phase electric motor powered by alternating current and having a delivery nozzle of predetermined cross-section, and electronic means for controllin... | 10/16/2007 |
| 7277289 | Resistor for controlling a fan motor rotating speed for use in an air conditioner Provided is a resistor for controlling a fan motor rotating speed for use in an air conditioner. The resistor comprises a base body, a radiator attached to a top portion of the base body, a printed resistor circuit board covered with insulating sheets and received w... | 10/02/2007 |
| 7271563 | Apparatus for controlling operation of reciprocating compressor, and method therefor The present invention discloses an apparatus for controlling an operation of a reciprocating compressor and a method therefor which can reduce errors in an operation of a stroke estimated value of the reciprocating compressor, by previously preventing over-saturatio... | 09/18/2007 |
| 7249936 | Dual capacity compressor A dual capacity compressor, which can maintain a fixed eccentricity and stable operation, even when the compressor is rotated in both the regular and reverse directions in order to provide multiple compression capacities, is provided. This dual capacity compressor i... | 07/31/2007 |
| 7244106 | Process and device for flow control of an electrical motor fan A method and configuration from maintaining a constant of air to a protective helmet (4) from a fan (3) in a battery powered fresh air unit. The fan (3) is a radial fan with a filter (5) positioned on the suction side of the fan and is op... | 07/17/2007 |
| 7238165 | Fluid pump A pumping system 10 provides a physiological pulsatile flow and includes controller 121, a pump drive head 50 coupled to a motor 12 and a fluid housing 52 having at least one port 60. The port 60 includes a ball valve... | 07/03/2007 |
| 7234216 | Method for support control in machine tools Method for support control in machine tools where it is controlled whether an object is arranged correctly on a support surface in the machine tool, where a duct system is used which ends in the support surface, and conducts a medium, and can be pressurized, the fin... | 06/26/2007 |
| 7213405 | Two-stage linear compressor A refrigeration system includes a dual-piston linear compressor including a first piston disposed in a first cylinder and a second piston opposed to the first piston and disposed in a second cylinder. The first piston divides the first cylinder into a first suction ... | 05/08/2007 |
| 7191608 | Cooling apparatus There is provided a cooling apparatus which can prevent an abnormal increase in pressure of a high side at the time of starting. The cooling apparatus comprises: a refrigerant circuit which uses carbon dioxide as a refrigerant; and a control device which controls a ... | 03/20/2007 |
| 7187062 | Coupler detector The present invention is a coupler built on a semiconductor substrate, e.g. GaAs. Semiconductor processing allows for small trace and space rules. The tighter design rules provide for tighter coupling than can be achieved by ceramic processes. The greater coupling a... | 03/06/2007 |
| 7184254 | Apparatus and method for controlling the maximum stroke for linear compressors An apparatus and method for controlling the maximum stroke of a linear compressor is provided. The shorting of the normal supply voltage of a compressor to ground is used to detect overstroking. A plurality of transistors are electrically coupled to the control circ... | 02/27/2007 |
| 7182585 | Electrically driven flow compressor The invention relates to an electrically driven flow compressor comprising a drive (2, 3)—and a flow compressor and a converter (5) for electrical supply and control of the drive unit (2, 3).According to the invention, the converter (5)... | 02/27/2007 |
| 7163380 | Control of fluid flow in the processing of an object with a fluid An apparatus for and methods of control of a fluid flow. In a system for supercritical processing of an object, the apparatus includes a measuring device for measuring a pump performance parameter and a controller for adjusting a fluid flow in response to the perfor... | 01/16/2007 |
| 7154245 | Method to prevent midrange resonance during operation of a multi-phase step motor The frequency of the pulse width modulator within a step motor control circuit is increased above a base frequency under defined conditions to enable more accurate construction of the phase current waveform for preventing mid-range resonance. The PWM frequency is st... | 12/26/2006 |
| 7140843 | Fluid pump for medical purposes and measuring chamber therefor Fluid pump for medicinal, especially endoscopic, applications having a transport channeled through a drive, a device possessing a measuring chamber for measuring the pressure of the fluid conveyed in the transport channel and control means for the automatic control ... | 11/28/2006 |
| 7096681 | System and method for variable speed operation of a screw compressor A system and method are provided for variable speed operation of a screw compressor to obtain increased capacity and efficiency. The screw compressor is connected to an induction motor driven by a variable speed drive, wherein the screw compressor has a variable out... | 08/29/2006 |
| 7090470 | Apparatus and method for preventing a piston and valve collision in a linear compressor An apparatus and method for controlling a linear compressor is provided. The linear compressor controlling apparatus includes a voltage detection unit, a current detection unit, a control unit and a compressor drive unit. The voltage detection unit detects a voltage... | 08/15/2006 |
| 7090469 | Turbomolecular pump A turbomolecular pump (10) comprises a stator (12, 18), a pump rotor (20) a motor (28) for driving the pump rotor and a control device (42). The control device (42) controls the motor output power such that the motor output ... | 08/15/2006 |
| 7086838 | Fuel system with a field modification module for controlling fuel flow The present invention provides a system for controlling speed of the fuel pump. The system includes a fuel pump, a controller, and a field modification module. The fuel pump is configured to receive a driving signal causing the fuel pump to pump fuel. The controller... | 08/08/2006 |
| 7083392 | Pump and pump control circuit apparatus and method A method and apparatus for a pump and a pump control system. The apparatus includes pistons integrally formed in a diaphragm and coupled to the diaphragm by convolutes. The convolutes have a bottom surface angled with respect to a top surface of the pistons. The app... | 08/01/2006 |
| 7080792 | Liquid pressurizing device A liquid pressuring device comprises a reciprocating pump (1), pressure sensor (23) and pressure control unit (25) which is adapted to control the motion of the plungers (5A, 5B) so as to make an actual delivery pressure value reac... | 07/25/2006 |
| 7045983 | System for controlling motor speed by altering magnetic field of the motor The present invention provides a system for controlling the speed of a motor by altering the magnetic field of the motor. The system includes field modification module, and a motor having field windings and a rotor. The field windings are configured to receive a dri... | 05/16/2006 |
| 7033141 | Linear compressor and method for controlling the same A linear compressor and a method for controlling the same. The linear compressor automatically short-circuits part of a coil having no power-supply voltage in order to substantially prevent an excessive stroke from being generated when the linear compressor is initi... | 04/25/2006 |
| 7029239 | Piecewise linear control of the duty cycle of a pulse width modulated signal A system may include a PWM generator and control logic. The PWM generator is configured to generate a PWM signal having a duty cycle dependent on a duty cycle value generated by the control logic. The control logic is configured to generate the duty cycle value to h... | 04/18/2006 |
| 7028491 | Method and apparatus for reducing inrush current in a multi-stage compressor A compressor assembly having a first compression mechanism operatively coupled to a first motor and a second compression mechanism operatively coupled to a second motor. The first compression mechanism compresses the vapor from a low pressure to an intermediate pres... | 04/18/2006 |
