48 results about "Maximum flux" patented technology

An electromagnetic lock monitoring system for monitoring the strength of a magnetic field in an electromechanical lock which is created when a steel armature plate is closed against an electromagnet. The system utilizes dual Hall Effect devices positioned in such a way that both ends of the electromagnet and both magnetic fields are monitored, and that the resulting monitoring effectively covers the complete contact surface between the electromagnet and the armature plate. Preferably, the Hall Effect devices are disposed in series at the point of maximum flux density within the center element of an E-shaped electromagnetic core, at opposite ends of the core. If the magnetic flux is below a preset limit, a relay also in series drops out, triggering an alarm which may be sonic, electronic, and / or visual, as is known in the prior art.

A portable oxygen concentrator includes a pressure swing absorption system defined by a relatively rigid housing adapted to generate a flow of oxygen enriched gas and a battery adapted to provide power to the pressure swing absorption system. The oxygen concentrator has a total weight of less than about 10 lbs, has a maximum flow of 100% O2 equivalent gas of about 0.9 lpm, has a total volume less than about 800 in3, and gas a battery life of at least about 8 hours. The present invention also using a liquefaction or transfill system in combination with such an oxygen concentrator.

The invention relates to a method of operating a synchronous motor (1) having a stator comprising a set of electromagnets (7, 9) and having a permanent magnet rotor (5), wherein the synchronous motor (1) is controlled by calculating in a flux controller (f) a measure of a flux magnitude, which is the magnitude of the stator flux of the motor (1), and is controlled by calculating in a load angle controller (g) a measure of a load angle. Information about a desired motor torque or a reduced motor torque, which is smaller than the desired motor torque, is input to the load angle controller (g) and the load angle controller (g) calculates the measure of the load angle depending on the input motor torque. The measure of the flux magnitude is combined with the measure of the load angle to obtain commands for controlling electric currents of electromagnets of the stator, thereby directly controlling the stator flux. A flux limit value which depends on a predetermined maximum value of the stator flux allowed for the motor (1), which depends on a maximum value of an electric voltage, which is used to drive the currents through the stator electromagnets (7, 9), and which depends on the actual rotor speed is repeatedly calculated. During acceleration of the rotor (5) while the stator flux is smaller than the maximum flux allowed for the motor the measure of the flux magnitude is calculated depending on the output of a predetermined function, wherein the output of the predetermined function depends on the desired motor torque and corresponds to the magnitude of the stator flux, which results in the desired motor torque using the minimum possible stator current. The measure of the load angle is calculated depending on the desired motor torque.

A relative flux sensor (122) and a method of characterizing characteristics of light emitters are provided. The relative flux sensor (122) comprises a color point sensor(108) and a sensor color (118). The color point sensor (108) measures a color point in a color space of light emitted by a light source (101) comprising a first light emitter (102) for emitting light of a first color and a second light emitter (114) for emitting light of a second color being different from the first color. The light source (101) is arranged for emitting light of a controllable color,being a mix of light of the first color and light of the second color.; The sensor controller (118) is coupled to the color point sensor (108) for receiving a measuring signal and is arranged for i)providing a first signal to the light source (101), the first signal comprising a dimming factor D1 and a dimming factor D2, the dimming factor D1 and the dimming factor D2 indicating a fraction of a maximum flux of the first light emitter(102) and the second light emitter (114), respectively, and receiving the measuring signal representing a first color point when the light source (101) emits light according to the first signal, wherein at least one of the dimming factors D1 and D2 is different from 0, ii) providing a second signal to the light source (101), the second signal comprising a dimming factor D4 and a dimming factor D5, the dimming factor D4 and the dimming factor D indicating a fraction of the maximum flux of the first light emitter (102); and the second light emitter (114), respectively, and receiving the measuring signal representing a second color point when the light source (101) emits light according to the second signal, wherein both dimming factors D4 and D5 are different from 0, iii) calculating within a model of the color 20 space a ratio between a maximum flux of the first light emitter (102) and a maximum flux of the second light emitter (114) on the basis of the first color point, the second color point, the dimming factors D1, D2, D4 and D5.

A turbine wheel and gear system rotate an output shaft in response to flow, where the output shaft is connected to a clutch cup that engages a clutch and valve disk. The disk cooperates with a valve seat formed on a piston to permit / prevent flow within the piston. During flow, the clutch clamps to the disk, and the piston and disk move downstream until an associated control member hits a stop, opening the valve (as the disk stops), while the piston continues downstream. The clutch rotates the disk and control member, and if a maximum flow volume occurs, the control member rotates to an interrupt position and is released from the stop, closing the valve. Passages allow restricted flow to disengage the clutch and permit a spring to move the piston and valve upstream until engaging a reset cam that rotates the control member back to an initial position.

An electrical machine is provided with one or more flux plates at the end of the stator and rotor cores. On the stator side, the plate is profiled to substantially fill the void between the core and the winding. The plates are ferromagnetic and form part of the main magnetic circuit. They carry maximum flux at zero and low switching frequencies and substantially no flux at the highest operating speeds.

The invention relates to a device and method for continuous measurement of flow characteristics of a pneumatic pressure reducing valve. The device mainly includes: filter, air supply pressure setting pressure reducing valve, air supply side stop valve, air supply side temperature measuring tube, control side temperature measuring tube, air supply side pressure measuring tube, control side pressure measuring tube, Measure pressure reducing valve, bi-directional flowmeter, control side stop valve and control side pressure reducing valve; The flow measurement function realizes continuous measurement of pressure and flow through uninterrupted manual or automatic setting from the positive maximum flow to the overflow to the maximum flow, so as to measure the control port flow and control port pressure of the pressure reducing valve under test. Relationship, that is, the flow characteristics of the pressure reducing valve under test. The invention simplifies the experimental circuit, reduces the exchange of test equipment and the measurement error generated, improves the test efficiency and saves the air consumption.

A self-latching sector motor for producing a net torque from two integral independent sources where one can serve as a spare backup or paralleled for double net torque or used alternately for extended life operation. The self-latching sector motor includes a housing, a magnet-shaft assembly, and two pair of electromagnetic poles. The magnet-shaft assembly rotates within the housing. The two pair of electromagnetic poles extend fixedly and radially inwardly from the housing, towards the magnet-shaft assembly. The electromagnetic poles of an associated pair of electromagnetic poles are diametrically and magnetically opposed to each other, and each pair of electromagnetic poles are similarly poled to each other for North and South poles so as to provide the net torque to the magnet-shaft assembly that can be backed-up or doubled. The self-latching torque at the stops is achieved by restraining the magnet-shaft assembly from seeking a position of maximum flux.