93 results about "Electromagnetic load" patented technology

The invention discloses an experimental device of a split hopkinson pressure bar based on electromagnetic force load. The experimental device comprises an electromagnetic riveting device and a split hopkinson pressure bar experiment device, wherein the electromagnetic riveting device is arranged at one end of an incident bar of the split hopkinson pressure bar experiment device; the end face of an electromagnetic riveting gun on the electromagnetic riveting device is in full contact with the end face of the end of the incident bar, so that the electromagnetic riveting device can generate stress pulse which is directly input into the incident bar and generated pulse signals can be accurately controlled. By adopting the experimental device, the split hopkinson pressure bar is not greatly improved; the electromagnetic riveting device is only used for replacing an air gun in a conventional split hopkinson pressure bar system; accurate control of stress wave is achieved in an electromagnetic way; meanwhile, the width of the stress wave generated by the electromagnetic load is not limited by the length of an impacting bar, so that the width of the stress wave generated by the experimental device is large enough at a high strain rate, thereby achieving the normalization of experimental technologies of the split hopkinson pressure bar.

A battery-free wireless optical mouse comprises a wireless optical mouse and a mouse pad. This invention is different from the traditional optical mouse is that it is battery-free. It has no power connector and requires no battery. The wireless optical mouse and mouse pad are installed with an electromagnetic inductance coil. The electromagnetic induction generated by the effect of two electromagnetic inductance coils on the wireless optical mouse and mouse pad emits one-way energy capacity to the electromagnetic inductance coil of the wireless optical mouse and provide the necessary power to the optical mouse. The two electromagnetic inductance coils can be adjusted to change the electromagnetic load characteristics, such as electric current load response or frequency response to obtain one-way data transmission purpose. The data are then converted into the proper computer format through the data processing of the mouse and transmitted to the computer.

A load device for an apparatus for physical exercise that comprises a device that generate the load called linear motor, a micro controller, a series of sensors (dynamic, diagnostic and physiological) and a user interface.

A power added efficiency optimizer apparatus is provided for measuring and monitoring input and output power of an amplifying device, and adjusting the load impedance seen by the amplifying device so that power added efficiency is maintained at optimum levels. A power added efficiency optimizing device includes a variable load impedance that can be controlled, at least one power detection device located after the load, a difference forming apparatus, and at least one coupling device. The power added efficiency optimizing device provides an ability to maintain an amplifier at peak efficiency in a dynamic way and in the presence of changing electromagnetic load conditions.

The invention discloses a novel fitness load mode and a fitness load device thereof, and relates to the technical field of fitness equipment. The novel fitness load mode comprises: an electromagnetic load module, which is used for providing load force; a control module, which is connected with the electromagnetic load module and which is used for controlling the power of the electromagnetic load module according to the requirements of a trainee so as to control the magnitude of the load force and also used for displaying consumed heat and recording exercise time and stretching times; and a fitness module, which is connected with the electromagnetic load module and which is used for the trainee to carry out fitness training against the load force of the electromagnetic load module. By the adoption of the technical scheme, countermeasure fitness training in a weight mode can be avoided, and the novel fitness load mode has the advantages of being convenient in load force adjustment, small in occupied space and high in safety coefficient.

A switch-mode power amplifier circuit using high power, low distortion waveforms is connected to an electromagnetic load to provide a high degree of control over the load. The circuit comprising a plurality of half-bridge networks having outputs combined at a summation point. The half-bridge networks are switched to provide power outputs sequenced to generate an interlaced output at the summation point which is operably connected to the load so that for a given switching frequency of the networks the operational frequency of the circuit is increased. The sequencing of the half-bridge outputs to generate an interlaced output facilitates the reduction of the switching frequency of individual switching components within the half-bridges while at least maintaining the overall operational frequency of the circuit. For N half-bridges operating at ƒkHz, the overall operational frequency of the circuit is NƒkHz. Alternatively, the switching frequency of individual switching elements of a system operating at ƒokHz may be reduced by a factor of N. A feedback signal generated across the load is included at the summation point and is optionally augmented to decrease distortion.

The invention discloses a device for testing the AC loss of a superconducting conductor, which comprises a low temperature Dewar, and is characterized in that the low temperature Dewar is internally provided with a fiber reinforced plastic bracket, a sample support is installed on the fiber reinforced plastic bracket, a superconducting conductor is fixed on the sample support, both ends of the superconducting conductor are clamped with a force applying device, two sides of the superconducting conductor are respectively provided with back field magnets, the upper and lower ends of the low temperature Dewar are respectively provided with a helium outlet and a liquid helium inlet, and the sample support is further provided with a calibration heating resistor. The device plays a great role inperformance testing for the AC loss of the superconducting conductor, the pressure received by a cable can be adjusted the stress applying device so as to simulate the AC loss performance of the tested cable under different electromagnetic loads, and there are detection coils in the X and Y directions, so that the magnetic moment change of the conductor in the two directions can be obtained. The device is simple to operate and reliable in structure, and provides good conditions for the development of superconducting conductor technologies in the future.

The invention relates to an arrangement for the remote-controlled release of active ingredients which are located with a magnetic body in a cavity and which are released under the influence of heat. A substantially biocompatible device, which avoids unnecessary thermal and electromagnetic loads, is created by producing the heat required for releasing the active ingredients by rotating the body in the fluid.

The invention discloses a temperature-pressure coupling bidirectional electromagnetic loading dynamic compression-shear experimental device and a testing method. The device comprises a supporting seat, a loading rod, a dynamic loading device, a static loading device, a temperature control mechanism and a dynamic compression-shear mold arranged in the temperature control mechanism. By arranging the temperature control mechanism, the device can perform temperature rise and heat preservation on the test sample before and in the dynamic and static combined compression-shear test, so that dynamic and static combined compression-shear test research on the test sample under the condition of temperature-pressure coupling is realized. The problem that in the prior art, dynamic compression-shear tests of rock-like solid materials such as rocks and concrete under different temperature and static prestress environment conditions cannot be carried out is solved, so that test conditions are closer to real occurrence and working conditions of the rock-like solid materials such as rocks and concrete under a natural environment; therefore, a test result can be closer to a real situation, and the device and method have more scientific value and practical significance for engineering practice.

The invention discloses a three-phase AC asynchronous motor for YDAX series of electric automobiles, which is provided with a machine shell, a stator and a rotor, wherein the slenderness ratio of the motor is 1.3-6.0, heat radiating fins on the machine shell are vertically and uniformly distributed on the circumference of an engine base, and a wire exit is arranged at the rear end of the engine base; the rotor has two shafts; a magnetic permeability material adopts a low-loss cold rolled silicon steel plate which has reasonable electromagnetic load design so that the efficiency is 1-5 percenthigher than that of a common high-efficient motor; an air gap between the stator and the rotor is increased by 0.3-0.4 times, slot combination adopts 36/28 or 36/33 or 54/44 or 72/64, the slot shape of the rotor adopts a pear-shaped round bottom or pear-shaped flat bottom or convex symmetrical or asymmetrical slot shape, and three-phase windings of the motor adopt a Y-shaped connection method with a maximum parallel branch; a class insulation IBGT (Insulated Gate Bipolar Transistor) insulation system is adopted, and a stator core winding is manufactured by hopper round wires special for a QP-2/200 variable frequency motor. Compared with the prior art, the motor has safe and reliable running, small vibration, low noise, large temperature rise margin and equal output torque with that of a petrol engine, and completely meets the requirements of the electric automobiles.

The invention provides a three-dimensional magnetic flux permanent magnet linear motor of a multi-air-gap independent winding structure and belongs to the technical field of motors. The three-dimensional magnetic flux permanent magnet linear motor comprises a primary assembly, a secondary assembly and multiple air gaps. The primary assembly comprises n primary units and armature windings, and the primary units are arranged perpendicular to the horizontal direction. An array composed of 2m+1 permanent magnets arrayed in a polarity staggering mode is arranged on each primary unit, the width of each permanent magnet is T/2 (T is polar distance), and two rectangular grooves are formed by annular magnetic permeability iron cores arranged at the two ends of each permanent magnet and the permanent magnet, and the armature windings are arranged in two grooves in the vertical direction and are the same in phase. The secondary assembly is composed of n-1 secondary units, wherein the secondary units and the primary units are arrayed perpendicular to the horizontal direction in a staggered mode, and non-magnetic-permeability grooves or magnetism isolation bridges are arranged periodically arranged on secondary unit iron cores. The non-magnetic-permeability grooves of the adjacent secondary units are staggered by T/2 distance in the horizontal direction. The motor is provided with 2n-2 air gaps. A three-dimensional magnetic circuit is adopted for the motor, high electromagnetic loads can be effectively achieved, and the motor has the advantages of being high in thrust density and reliability.

The invention discloses an explosion proof type three phase alternating current asynchronous motor used for an electric automobile, which is provided with an explosion proof type housing, an explosion proof type junction box, a stator and a rotor, wherein a low loss cold rolled silicon steel plate is made of magnetic materials, the electromagnetic loads of the silicon steel plate are 1.0-1.45T of stator tooth flux density, 0.9-1.2T of stator yoke flux density, 1.0-1.4T of rotor tooth flux density, 0.6-0.9T of rotor yoke flux density, 0.5-0.65T of air-gap flux density, 3.0-5.5A/mm2 of stator winding electricity density, 1.2-3.5A/mm2 of rotor conducting bar electricity density and 180-280A/cm of line load; the stator and rotor air gap is 1.1-1.3 times larger than the air gap of industry YB2 series under the same power pole number, slot coordination is 24/22, the slot shape of the rotor is a pear shape with a round bottom and the like, a delta connection method or a Y connection method of maximum parallel branches is adopted for the three phase winding of the motor, and the rotor is a mouse-cage rotor; and H-level insulation and an IBGT (Insulated Gate Bipolar Transistor) insulated system are adopted for the motor. The explosion proof type three phase alternating current asynchronous motor operates safely and reliably in an explosive gas environment, is efficient and energy-saving, and has high torque, small vibration, low noise and large temperature rise margin.

The invention discloses a large-depth autonomous underwater vehicle electromagnetic load rejection device which comprises a shell, a ballast mechanism and an execution mechanism. The ballast mechanismand the execution mechanism are connected to the shell. The large-depth autonomous underwater vehicle electromagnetic load rejection device has the advantages that an electromagnet adopted as a trigger source has the characteristic of being high in response speed, a mechanical hook and a spring serving as the execution mechanism have the characteristics of being simple in installation and convenient to maintain, long and short hinge pins are used as ballast device guide rails so that load reduction can be finished at the large inclination angle, reliability is high, and the safety performanceis good.

The invention discloses a linear drive high-speed press. A linear motor - switch flux permanent magnet linear motor with a novel topological structure is adopted to drive a press punch to perform straight reciprocating motion. The motor and a secondary promoter connected with the punch are simple in structure, and structural damage to a permanent magnet caused by continuous impact load of the press can be avoided. The press punch is light in inertia and quick in dynamic responses such as acceleration and deceleration, startup and shutdown and the like, the permanent magnet and an armature winding are fixed to a press body, the demagnetization risk of the permanent magnet is reduced through a cooling system, the electromagnetic load density of the motor is increased, and thus motor thrust and stamping force of the press are improved. The armature winding and the permanent magnet only exist within a primary effective length of the motor outputting thrust, the usage amount thereof is greatly reduced, and the motor manufacturing cost is reduced. In addition, a cylinder is arranged to be connected with the punch, so that an air pressure force and the electromagnetic thrust of the motorjointly act to serve as stamping force, and the press tonnage is greatly improved.

The invention relates to a novel cooling and heat dissipating device installed in a motor casing, and belongs to the technical field of motors. The invention aims at providing a motor heat dissipatingdevice with wide application range and high heat dissipating efficiency. The novel cooling and heat dissipating device provided by the invention comprises a heat dissipating sleeve and a heat dissipating pipe group installed above the heat dissipating sleeve, the heat dissipating sleeve is of a hollow cavity structure, the heat dissipating sleeve is filled with cooling liquid, the heat dissipating pipe group is composed of a plurality of heat dissipating pipes, each heat dissipating pipe is of a tubular structure having two open ends and a hollow interior, the heat dissipating sleeve is attached to an outer surface of the motor casing, the two ends of each heat dissipating pipe communicate with the heat dissipating sleeve, and a heat dissipating gap is reserved between the pipe body of each heat dissipating pipe and an outer wall of the motor casing. The novel cooling and heat dissipating device provided by the invention replaces the conventional heat dissipating structures such as aconventional motor coaxial fan and the like, has a simple structure and a small installation size, further increases the electromagnetic load of the motor, and improves the power density.

A layer short-circuit of a switch element such as a FET included in an electromagnetic load circuit is detected to accurately perform a failure diagnosis of the electromagnetic load circuit. A failure diagnosis circuit 101 is provided which detects a layer short-circuit in which a high-side switch element, a low-side switch element, or an electromagnetic load itself short-circuits with a power supply voltage terminal or a ground in a state of having a predetermined impedance to perform a failure diagnosis.