Abstract:
The present disclosure relates to a heat dispersion apparatus for motors, which comprises: a cooling fan, and a guide cover. The cooling fan has a plurality of fan blades disposed radially on a back plate, the outside portion of the fan blades axially extend beyond the periphery of the back plate, and the back plate is a cone structure. The guide cover has air inlet, a plurality of holes opened on the surface of the air inlet with slots, the slots arranged in accordance with the rotation direction of the cooling fan, and each slot set up a chamfer for leading into more air to reduce temperature. With this device, airflow supercharging and peripheral axial flow are improved, and the slot structure and the cooling fan blades can introduce a large scale of air; thereby the present invention provides a significant improvement to motors.
Abstract:
A measuring system, during a measurement process thereof, uses a phase-locked loop mechanism of a stator phase voltage and a stator phase current of a three-phase AC motor to effectively remove harmonics and to sense and obtain the amplitude effective values of the phase voltage and the phase current of the three-phase AC motor and the phase difference between the phase voltage and phase current. Therefore, the measuring apparatus is capable of quickly and accurately calculating the input power of the motor without having to measure the parameters of the motor.
Abstract:
The present disclosure relates to a multiple-capacity centrifugal compressor, which includes a plurality of capacity-control mechanisms. Each of the capacity-control mechanisms includes an inlet guide vane and an outlet diffuser, so that the multiple-capacity centrifugal compressor provides a flexible control strategy. In addition, the present disclosure further provides a method for controlling the multiple-capacity centrifugal compressor that effectively adjusts and controls the capacity-control mechanisms by coarsely adjusting the inlet guide vanes and combined with subsequently adjusting the outlet diffusers.