57results about How to "Avoid mechanical loss" patented technology

The invention belongs to the control technical field of a brushless direct current motor, and provides a braking method for maintaining non-fluctuation of electromagnetic torque communication and controllable magnitude of braking torque; the torque control performance of the motor under a braking state can be improved; and in the process, fluctuation of communication torque does not exist, and the control performance is not affected by the rotary speed of the motor. According to the technical scheme provided by the invention, the stable electromagnetic braking method applicable to the brushless direct current motor comprises two steps of modulation strategy switching and commutation current control, wherein the step of modulation strategy switching is carried out by performing reasonable partitioning on the rotary speed of the motor according to specific motor parameters and requirements of a designer; the rotary speed of the motor is partitioned into a high-speed region and a low-speed region; feedback braking which refers to a modulation strategy 1 is adopted in the high-speed region while plug braking which refers to a modulation strategy 2 is adopted in the low-speed region; the step of commutation current control is carried out by designing a commutation duty ratio compensation controller; the commutation duty ratio compensation controller is matched with a main controller to form a current controller; and finally, a proper commutation duty ratio is calculated. The stable electromagnetic braking method and apparatus are mainly applied to the design and manufacturing occasions of the brushless direct current motor.

The present invention related to a fluent metal delivery pump which includes a pump case, a drive capstan and blade, characterized in that the pump case is a upright cylinder; the drive capstan is a screw axis mounted inside the cylinder; and the blade is helical blade surrounding the screw axis; the screw axis is supported by a gear bearing that fixed above the cylinder; and a drive capstan is supported by the gear bearing seat that coaxially connected with the cylinder. sealing blade wheel is provided in the invention which can rotate when driven by the drive capstan and generate centrifugal pull to form some certain negative-pressure inside the pump case, realize dynamic sealing of the pump, prevent cadmium liquor from overbrimming from the gear bearing seat. A structure that utilizingpart above the liquid level of the cylinder clad the insulating course is adopted in the invention, so that cadmium liquor remained inside the pump will not cooled quickly after pump stopped which can prevent the remained cadmium liquor from quick crystallization and make mechanical damage to each components, and can prolong service life of the pump.

This invention discloses a kind of gear type compressor. It includes:moter; gear type compressing part which compresses refrigerants flowed from evaporator by driving power provided from moter; gear type expanding part which expands the refrigerants reabsorbed by condenser after outputting from compressing part. The gear type compressing part includes: main bearing fixed at the underside of electric engine; ring shaped compressing cylinder which connects to the underside of main bearing and forms oil groove on peripheral face; outer gear which is positioned at the inner space of compressing cylinder and can rotate; inner gear which is arranged at the inner side of outer gear and receives driving power provides from electric engine. It rotates by gearing into the outer gear and compresses refrigerants at the same time; compressing board which connects to the underside of compressing cylinder. Lubricating oils, which are provided to each cylinder and outer gear of expanding part and compressing part, diffuse to the whole surface of contact area to prevent mechanical loss due to friction.

The invention provides a pump body structure of a compressor and a compressor with the same, wherein the pump body structure of the compressor comprises a crankshaft and a lower flange. The crankshaft comprises a long shaft, a short shaft and an eccentric shaft, the eccentric shaft is connected between the long shaft and the short shaft, the short shaft is provided with a first matching surface, the lower flange is provided with a second matching surface matched with the first matching surface, and the first matching surface is a rotating surface capable of bearing an axial load. The invention further provides a compressor comprising the pump body structure. Through the pump body structure and the compressor, problems of mechanical loss, noises, vibrations and the like are solved by the elimination of capsizing moment and the realization of automatic alignment; on the foundation, an oil pipeline is designed, thus the lubrication between kinematic pairs is increased, the abrasion is reduced, and the axial structure of the compressor is more compact; therefore, the effect of improving the reliability and the performances of the compressor is achieved.