2results about "Single-phase induction motor starters" patented technology

A kind of commercial refrigeration compressor motor starter structure matched with electrical junction box, including motor starter assembly, assembly includes starter box body, starter box body cover, first, second PTC and first, second electrode sheet, starter box body cover is embedded with starter box body, the middle part of starter box body has PTC installation cavity, rear end has current control mechanism cavity, front end has starting capacitor electrical connection foot cavity, PTC installation cavity is separated by rear partition between current control mechanism cavity, PTC installation cavity is separated by front side wall between starting capacitor electrical connection foot cavity, the rear end of first electrode sheet has the flexible pressing foot of PTC electrical contact controlled silicon control, middle part has the flexible pressing foot of second PTC upper side electrical contact, front end has starter capacitor electrical connection foot, the rear end of second electrode has the flexible pressing foot of bidirectional thyristor electrical contact, middle part has the flexible pressing foot of second PTC lower side electrical contact.Advantages: modular effect is good, meet the matching installation requirement of fast and efficient.

A motor drive method comprising: obtaining a frequency variation curve corresponding to a single-phase induction motor, wherein the frequency variation curve is configured to indicate multiple set frequencies, and comprises a target frequency; providing a power command to the single-phase induction motor, wherein an initial frequency of the power command is less than the target frequency; when one of the multiple set frequencies corresponding to the present time is greater than the initial frequency, controlling the present frequency of the power command according to the frequency variation curve; when one of the multiple set frequencies is less than or equal to the initial frequency, maintaining the present frequency; when the output current is greater than or equal to the current threshold, fixing the present voltage; and when the output current is lower than the current threshold, increasing the present voltage.