Abstract: The present disclosure discloses a damping device, a cooker and a device having a damping structure, wherein the damping device is arranged between a main body and a cover body, comprising a rotary member (2) fixed on the cover body; a fixed member (11) fixed on the main body, the fixed member (11) being a hollow body having openings at two ends, the rotary member (2) being nested in the hollow body, one of the rotary member (2) and an inner side wall of the hollow body being provided with a friction member (21), the other one being provided with an elastic piece (14); during the process of opening the cover body, the elastic piece (14) is slidably fitted with the friction member (21) and generates varying frictional resistance during sliding. The damping device is less susceptible to outside temperature and humidity and thus is less likely to fail.

Abstract: The invention discloses a control method for balancing scaling errors of multiple current sensors for PMSM. An impedance network is set between a direct current power supply and a three-phase inverter connected to a PMSM to avoid positive and negative poles of the direct current power supply being short-circuited under actions of shoot-through vectors. Under actions of two shoot-through vectors in a PWM cycle, three-phase current sensors are used to respectively sample the sum of currents in each branch of three-phase output branches of the three-phase inverter and a branch of the same bridge arm of the three-phase inverter, according to the sampled currents, operating to obtain the relationship between the scaling error coefficients of the three-phase current sensors. Then, correction coefficients are calculated. The correction of the scaling errors of the current sensors is implemented using correction coefficient feedback control.