Abstract: A device for detecting a slot wedge, an air gap and a broken rotor bar is provided, where a sequential circuit generates double concurrent pulses; the sequential circuit is connected to driving power modules; the driving power modules are connected to front-end interface circuits; the front-end interface circuits convert the double concurrent pulses into corresponding magnetic-field pulses; the magnetic-field pulses are transmitted to power supply terminals on adjacent phases of stator windings through impedance matching pins and coupled at a corresponding coil, air gap and squirrel cage rotor to generate single groups of cyclic rotating magnetic potentials; single rotating magnetic potentials are sequentially generated in adjacent slots on each of the phases of the stator windings; rotating electric potentials in magnetic circuits with two symmetrical phases are magnetically coupled to form distributed coupling magnetic field reflected full-cycle waves for reflecting a difference of a corresponding slot wedg

Abstract: A low-temperature quick-freezing freeze-drying system provided by the invention includes: a compressor unit, a first heat exchanger, an air cooler, a second heat exchanger, a throttling element, a third heat exchanger, a circulating fan, a drying chamber, a third valve, a fourth valve and connecting pipelines, and the above elements form a refrigeration circulation loop, a quick freezing/freeze-drying circulation loop, and a desorption drying circulation loop, thereby realizing the low-temperature quick-freezing and freeze-drying of materials. The invention adopts the heat exchangers with a cold storage function, so that the refrigeration capacity of the compressor is stored and used intensively to achieve rapid cooling of the materials.

Abstract: The cryogenic liquid medium provided by the present invention includes at least one of an alkane composition, an olefin composition, an alcohol composition and an ether composition, and each of the alkane composition, the olefin composition, the alcohol combination and the ether composition includes a corresponding non-toxic and harmless substance having a melting point lower than ?110° C. and a standard boiling point higher than 50° C. Since the cryogenic liquid medium is formed by the non-toxic and harmless single substance having the melting point lower than ?110° C. and the standard boiling point higher than 50° C. or a binary, ternary and multi-component mixture thereof, the cryogenic liquid medium has a lower atmospheric boiling point, and is difficult to volatilize. The eutectic crystal of the specific mixture can be used to achieve the liquid requirements of low temperature, especially the temperature below ?110° C.

Abstract: A low-temperature quick-freezing freeze-drying system provided by the invention includes: a compressor unit, a first heat exchanger, an air cooler, a second heat exchanger, a throttling element, a third heat exchanger, a circulating fan, a drying chamber, a third valve, a fourth valve and connecting pipelines, and the above elements form a refrigeration circulation loop, a quick freezing/freeze-drying circulation loop, and a desorption drying circulation loop, thereby realizing the low-temperature quick-freezing and freeze-drying of materials. The invention adopts the heat exchangers with a cold storage function, so that the refrigeration capacity of the compressor is stored and used intensively to achieve rapid cooling of the materials.

Abstract: The cryogenic liquid medium provided by the present invention includes at least one of an alkane composition, an olefin composition, an alcohol composition and an ether composition, and each of the alkane composition, the olefin composition, the alcohol combination and the ether composition includes a corresponding non-toxic and harmless substance having a melting point lower than ?110° C. and a standard boiling point higher than 50° C. Since the cryogenic liquid medium is formed by the non-toxic and harmless single substance having the melting point lower than ?110° C. and the standard boiling point higher than 50° C. or a binary, ternary and multi-component mixture thereof, the cryogenic liquid medium has a lower atmospheric boiling point, and is difficult to volatilize. The eutectic crystal of the specific mixture can be used to achieve the liquid requirements of low temperature, especially the temperature below ?110° C.