48results about How to "Guaranteed Power Density" patented technology

The present disclosure relates to compositions comprising at least two different carbonaceous components, at least one being a surface-modified carbonaceous particulate material typically having a relatively high spring-back, and at least one other component being a carbonaceous particulate material (such as graphite) generally having a lower spring-back and / or a higher BET specific surface area than the surface-modified carbonaceous material component. Such compositions are particularly useful for making negative electrodes for lithium-ion batteries and the like in view of their beneficial electrochemical properties, particularly in automotive and energy storage applications. The present disclosure also relates to the use of a low-spring-back carbonaceous particulate materials as an additive in carbonaceous compositions, wherein said compositions are used to prepare anodes for Li-ion batteries in order to increase the electrode density, the cell capacity and / or the cycling stability of said battery while maintaining the power density of the cell compared to a cell with an anode absent the carbonaceous additive.

The invention belongs to the field of all-solid-state ultrafast laser technology, and discloses a femtosecond laser generation system with a high-power GHz repetition rate, a multimode fiber-coupled 981nm laser diode as a pump source; a collimation and focusing system, and a pump laser focusing to the center of the laser crystal to form a pump focus spot; the first concave mirror is used for reflection; Yb:KGW crystal is vertically cut and placed in the ring cavity; the second concave mirror is used for reflection; Kerr medium is used for Provide additional Kerr effect; the third concave mirror is used to provide second-order dispersion to compensate for intracavity dispersion; the fourth concave mirror is used to output high-power mode-locked femtosecond laser pulses. The invention can produce femtosecond laser pulses with high power GHz repetition frequency with excellent performance, compact structure, stable operation and low price by rationally designing the resonant cavity structure and using Kerr lens mode-locking technology and dispersion compensation technology.

The invention discloses an internal circulation oil-cooled permanent-magnet direct-current motor, and relates to a permanent-magnet direct-current motor, in particular to an oil-cooled permanent-magnet direct-current brushless motor. A motor shaft is horizontally arranged in a shell; a rotor is arranged on the motor shaft; the rotor is arranged on the outer circumference of the rotor; the rotor is folded into a magnetic core by disc-shaped steel plates; a sealing device is arranged on the motor; a cooling oil circulating system is arranged in the motor; in the system, the motor is filled with cooling oil; the disc-shaped steel plates are provided with steel plate through holes; when the disc-shaped steel plates are folded into the magnetic core, cooling oil circulation channels are formed among the steel plate through holes correspondingly; limit ring blades are arranged inside two limit rings; limit ring circular holes are reserved on the limit ring blades; the positions and the number of the limit ring circular holes are consistent with the positions and the number of the steel plate through holes on the disc-shaped steel plates; a respirator is arranged out of the shell; and the two ends of a conduit of the respirator are respectively connected with the lower cavity of the shell and the inside of the shell. The internal circulation oil-cooled permanent-magnet direct-current motor solves the problems that a cooling effect is poor and a permanent-magnet cannot be cooled directly in conventional similar motors.

The invention relates to a double-equal pole double-section stator / rotor reluctance generator, comprising two sections of stators and rotors of a salient pole structure or a non-salient-pole structure formed by laminating silicon-steel plates. A stator salient pole is provided with armature concentrated windings or layer windings; the windings are connected in series or in parallel according to the N-N polarity of the armature windings to form a phase, and the windings are connected in series or in parallel according to the S-S polarity of the armature windings to form the other phase; the rotors are equipped with rotating magnetic poles with the same pole number with the stators, and the adjacent pole windings of the rotors are connected in series or in parallel to form a plurality of N and S groups; the rotors can adopt excitation magnetic poles and permanent magnetic poles in different forms and permanent magnetic and electro-magnetic mixed poles, and a rotor excitation device is arranged on a motor shaft; each rotor can be divided into an inner rotor and an outer rotor; and the armature windings can be arranged on the stators or the rotors. In the invention, by adopting an equal-pole-number stator / rotor technology and series / parallel connection dynamic combination of the windings, output voltage can be regulated conveniently, the utilization ratio of the windings is improved, and power density and efficiency of the generator are enhanced.

The invention discloses a common-mode voltage suppression method and device using a virtual pulse vibration vector. Synthesize the virtual pulse vibration vector with the rotation vector with the opposite rotation direction, and establish a switch table using the virtual pulse vibration vector, select the virtual pulse vibration vector synthesized by the rotation vector by querying the switch table, and use the characteristic that the common mode voltage of the MC rotation vector is zero , the common mode voltage can be effectively suppressed, and at the same time, no hardware device is added, which avoids the increase of volume and weight of the motor system as in the prior art, and ensures the power density of the matrix converter. Moreover, it also maintains the advantages of DTC independent of motor parameters, simple calculation, and good dynamic performance.

The invention discloses a serial-parallel hybrid power drive device of a commercial vehicle. Only one clutch is arranged to achieve serial-parallel working condition switching, the speed increase of a generator is achieved through a speed increase planet row, the speed reduction and torque increase of a motor are achieved through a speed reduction planet row, and both the structure and the process are simple, which facilitates the layout of a power system of the commercial vehicle. The drive device specifically comprises an input shaft, the speed increase planet row, the generator, the motor, the clutch, the speed reduction planet row and an output shaft. In the drive device, pure electric drive or serial hybrid power drive is adopted for the start, low speed and medium speed working conditions; under the serial hybrid power working condition, the motor drives the generator to generate power through the speed increase planet row, the generator can work in an economical fuel consumption section at the moment, and redundant electric energy can be stored in a battery pack for pure electric running of the motor; under the high-speed parallel working condition, the clutch is engaged, power of the motor directly drives the vehicle to run, one time of energy conversion is omitted, and the drive efficiency is improved.

The invention discloses a mixed excitation permanent magnet motor based on a three-stage stator axial complementary structure. An outer stator of the mixed excitation permanent magnet motor comprisesthree outer stator stages arranged along the axial direction in an equally-spaced manner, the difference of the initial angles of every two adjacent outer stages is a mechanical angle alpha, and alphais equal to 360 degrees / p, wherein p is the number of pole-pairs of the motor, p is equal to 3i, and i is a positive integer; an armature winding is wound on the outer stator teeth of each outer stator stage respectively, and each armature winding is a fractional-slot concentrated winding respectively; the rotor is an internally installed V-shaped rotor with heteropolarly alternated poles, the rotor is provided with 2p / 3 permanent magnet pole pairs and p / 3 iron core pole pairs; an exciting winding is wound on the inner stator teeth of the inner stator, the number of pole-pairs of the excitingwinding is p / 3, and each exciting winding is an integer slot distributed winding respectively. The flux density of an outer air gap can be changed by taking the iron core pole of the rotor as a channel in a rotating magnetic field generated by the inner stator, and the problem that the counter potential amplitudes are unequal existing in the heteropolarly alternated poles is solved. Moreover, themanufacturing cost and demagnetization risk are reduced while the reliability is improved.

The invention relates to an equal pole single-section and double-section reluctance generator, which comprises two sections of stators and two sections of rotors, wherein the two sections of stators and the two sections of rotors are respectively of a salient pole structure. A stator pole is provided with armature concentrated wildings or layer windings, and stator windings can form multigroup reversed polarity series connection or like polarity parallel connection of each-phase winding. The rotors are provided with rotary poles with the same pole number as the stators, and each pole is a permanent magnet surface-mounted electric excitation hybrid pole or a permanent magnet built-in radial pole. The number of poles of the stators is equal to the number of poles of the rotors, and the stators and the rotors are respectively composed of even number of poles, namely pair poles. The length of the two sections of stators and the length of the two sections of rotors are equal, iron core poles of the two sections of rotors align with each other, and iron core poles of the two sections of stators are different from each other by 1 / 2 polar distance angle. Each rotor can be of an inner rotor type and an outer rotor type. When an outer armature is used, each rotor is a permanent magnet surface-mounted electric excitation hybrid inner rotor or a permanent magnet built-in radial inner rotor; and when an inner armature is used, each rotor is a permanent magnet surface-mounted electric excitation hybrid outer rotor or a permanent magnet built-in radial outer rotor. The equal pole single-section and double-section reluctance generator can be applied to the novel technical field of various frequency conversion speed change, frequency conversion voltage transformation and frequency conversion power transformation.