143results about How to "Constant load" patented technology

A centrifugal compressor assembly for compressing refrigerant in a 250-ton capacity or larger chiller system comprising a motor, preferably a compact, high energy density motor or permanent magnet motor, for driving a shaft at a range of sustained operating speeds under the control of a variable speed drive. Another embodiment of the centrifugal compressor assembly comprises a mixed flow impeller and a vaneless diffuser sized such that a final stage compressor operates with an optimal specific speed range for targeted combinations of head and capacity, while a non-final stage compressor operates above the optimum specific speed of the final stage compressor. Another embodiment of the centrifugal compressor assembly comprises an integrated inlet flow conditioning assembly comprising a flow conditioning nose, a plurality of inlet guide vanes and a flow conditioning body that positions inlet guide vanes to condition flow of refrigerant into an impeller to achieve a target approximately constant angle swirl distribution with minimal guide vane turning.

The present invention relates to methods for modulating a semiconductor laser and wavelength matching to a wavelength converter using monolithic micro-heaters integrated in the semiconductor laser. The present invention also relates to wavelength matching and stabilization in laser sources in general, without regard to whether the laser is modulated or whether second harmonic generation is utilized in the laser source. According to one embodiment of the present invention, a method of compensating for thermally induced patterning effects in a semiconductor laser is provided where the laser's heating element driving current I_H is set to a relatively high magnitude when the laser's driving current I_D is at a relatively low magnitude. Additional embodiments are disclosed and claimed.

Invertebral implants are provided for carrying bone graft material and extruding the bone graft material between the implant and the adjacent vertebral bodies. The implants include first and second implant extrusion members shiftable relative to one another between a pre-implantation configuration having an enlarged cavity for receiving bone graft material therein and an implantation configuration having a smaller cavity. As the first and second implant extrusion members shift during implantation to the implantation configuration bone graft material is extruded from the cavity and into gaps or spaces between the upper and lower vertebral engaging surfaces of the implant and the adjacent vertebral bodies. After extrusion the bone graft material is subjected to spinal loading and stress to encourage strong bone growth therethrough.

A centrifugal compressor assembly for compressing refrigerant in a 250-ton capacity or larger chiller system comprising a motor, preferably a compact, high energy density motor or permanent magnet motor, for driving a shaft at a range of sustained operating speeds under the control of a variable speed drive. Another embodiment of the centrifugal compressor assembly comprises a mixed flow impeller and a vaneless diffuser sized such that a final stage compressor operates with an optimal specific speed range for targeted combinations of head and capacity, while a non-final stage compressor operates above the optimum specific speed of the final stage compressor. Another embodiment of the centrifugal compressor assembly comprises an integrated inlet flow conditioning assembly comprising a flow conditioning nose, a plurality of inlet guide vanes and a flow conditioning body that positions inlet guide vanes to condition flow of refrigerant into an impeller to achieve a target approximately constant angle swirl distribution with minimal guide vane turning.

A centrifugal compressor assembly for compressing refrigerant in a 250-ton capacity or larger chiller system comprising a motor, preferably a compact, high energy density motor or permanent magnet motor, for driving a shaft at a range of sustained operating speeds under the control of a variable speed drive. Another embodiment of the centrifugal compressor assembly comprises a mixed flow impeller and a vaneless diffuser sized such that a final stage compressor operates with an optimal specific speed range for targeted combinations of head and capacity, while a non-final stage compressor operates above the optimum specific speed of the final stage compressor. Another embodiment of the centrifugal compressor assembly comprises an integrated inlet flow conditioning assembly comprising a flow conditioning nose, a plurality of inlet guide vanes and a flow conditioning body that positions inlet guide vanes to condition flow of refrigerant into an impeller to achieve a target approximately constant angle swirl distribution with minimal guide vane turning.

A method of detecting loss of refrigerant within a cooling system of the type having a condenser, a refrigerant receiver in fluid communication with the condenser, a sensor configured to detect a level of refrigerant within the receiver, an evaporator in fluid communication with the receiver, and a pump or compressor in fluid communication with the evaporator and the condenser, includes establishing a baseline measurement of refrigerant mass contained in the receiver with the sensor during certain power loads applied to the cooling system, monitoring a mass of refrigerant in the receiver with the sensor at a certain power load applied to the cooling system, and identifying whether the monitored mass of refrigerant is less than the baseline measurement of refrigerant mass over a predetermined period of time. Systems for detecting loss of refrigerant are further disclosed.

The present invention relates to a driver device (50a-50f) and a corresponding method for driving a load (22), in particular an LED unit comprising one or more LEDs (23). The proposed driver device comprises power input terminals (51, 52) for receiving a rectified supply voltage (vr) from an external power supply, power output terminals (53, 54) for providing a drive voltage and/or current for driving a load (22), a half bridge unit (70) comprising a first (60) and second (61) switching element coupled in series between a high voltage node (57) and a low voltage node (58) and having a switch node (59) between said first and second switching elements, a buck-boost input filter unit (71) comprising a first inductor (Lm) and a series diode (Dm) coupled between a power input terminal (51, 52) and said half bridge unit (70), a buck output filter unit (72) comprising a second inductor (Lo, Lc) coupled between said half bridge unit (70) and a power output terminal (53, 54), an energy storage unit (73), and a control unit (64) for controlling said switching elements (60, 61).

The invention relates to a vibration and abrasion test bench. A vibrating shaft input end is connected with an electromagnetic speed adjusting motor; the vibrating shaft is fixed at the bottom of a box body by a bearing; the center of the vibrating shaft is connected with an eccentric wheel; the eccentric wheel is matched and connected with a push rod by a pressure spring; the push rod is connected with the box body in a sliding way; the push rod is connected with a rotary disc by screw thread; a load spring is connected between the rotary disc and a sample plate; the sample plate is arranged at the top of the push rod; a top end is fixedly connected with a guide bench; the sample plate is connected with the guide bench in a sliding way; a cover plate is fixedly connected on the guide bench; a clamp is connected on the cover plate in a moveable way; the lower end of the clamp is fixedly connected with a standard sample; the top of the box body is connected with a rotary shaft; the lower end of the rotary shaft is connected with the clamp in a sliding way; and the input end of the rotary shaft is connected with the motor. The test bench disclosed by the invention can provide various compound environments with variable load, the presence of vibration, the absence of vibration and the like for studies of friction and abrasion between solids under the vibrating condition and various precise instruments can be arranged on the test bench for scientific researches. The test bench has good organization expandability.

The invention relates to a concrete lever type tension-compression creep device provided with a static pulley. The concrete lever type tension-compression creep device consists of a support device, a loading device and a test piece connecting device; the concrete lever type tension-compression creep device adopts a double-level mechanism to realize tension and compression. The concrete lever type tension-compression creep device has the beneficial technical effects that the device is simple and reliable in structure, is capable of applying a continuous and constant load onto a test piece, and is small in floor space; and two test functions including a tension test and a compression test can be provided by a set of device.

A vertically orientated hydraulically driven oilfield lift pump unit having a simplified hydraulic system. The system uses a pair of single acting hydraulic cylinders in tandem with a pair of double acting hydraulic cylinders interacting with hydraulic accumulators to provide an energy efficient, robust hydraulic system design with a minimum number of components.

The game apparatus shoots a moving object from a predetermined weapon object and moves the moving object in a three-dimensional space in a case where an input from an input device is received. At least one of the size, the shape, and the number of a contact determination area defined for the moving object is changed in accordance with a distance over which the moving object moves in the three-dimensional space. The game apparatus determines whether or not the contact determination area defined for the moving object contacts a contact determination area defined for a target object. A predetermined game process is performed when the determination result of a contact determination step is positive.

The invention discloses a reciprocating type micro-friction abrasion testing machine and belongs to a micro-friction and abrasion testing device. The testing machine comprises a bottom plate, and a bracket, a driving device, a loading device, a positioning and clamping device and a signal conditioning and data acquisition device which are arranged on the bottom plate, wherein the bracket at least consists of two side plates which are longitudinally fixed on the bottom plate; a lower sliding rail seat and a top cylinder seat are at least arranged between the two side plates. An exciter serves as a power source, the equipment is small in size and has high driving force and wide amplitude and frequency variation range, the signal is provided by a signal generation card, multiple driving signals are provided, the frequency and the amplitude are convenient to adjust, and the testing machine is easily controlled by a computer program; meanwhile, a clamp system for a fixation test is simple in structure, reliable in clamping and convenient to mount, and tests in multiple friction pair contact forms can be realized by replacing the clamp. The designed testing machine is high in precision and convenient to operate and provides a reliable experimental instrument for research of micro abrasion.

A method for controlling a vehicle's speed by adopting a desired speed v_set for the vehicle; determining a horizon for the intended itinerary made up of route segments, effecting the following during each of a number of simulation cycles (s) each comprising a number N of simulation steps conducted at a predetermined frequency f: first predicting the vehicle's speed v_{pred<sub2>—</sub2>cc} along the horizon with conventional cruise control when v_set is presented as reference speed, comparing the predicted vehicle speed v_{pred<sub2>—</sub2>cc} in a range v_min to v_max, making a second prediction of the vehicle's speed v_{pred<sub2>—</sub2>Tnew} along the horizon based on the vehicle's engine torque T; determining a reference value for how the vehicle's speed is to be influenced on the basis of at least one of the comparisons and the predicted vehicle speed v_{pred<sub2>—</sub2>Tnew}; controlling the vehicle by the reference value. A module for the foregoing controls a vehicle's speed.

A mounting system is disclosed for mounting a bearing assembly or other mechanical element to a shaft. The mounting system uses a tapered sleeve mechanism to secure the bearing assembly on the shaft. Specifically, a pressure loaded piston drives the sleeve from a pre-assembled position to an initial position. The initial position is determined by monitoring the pressure applied to the piston. Once the initial position has been reached, a linear indicator is used to measure the axial sleeve movement from the initial position to a final position. The system remains in place after the bearing is installed on the shaft and facilitates removal of the bearing assembly from the shaft.