The main circuit of the stator is controlled by five bidirectional contactless switches for forward and reverse rotation of the motor. The control board controls the triggering of the bidirectional contactless switch to control the turning on and off of the bidirectional contactless switch and extend it. Time control, the purpose is to make the original running contactless switch be reliably turned off when the motor suddenly runs from the forward direction to the reverse direction, to prevent the forward contactless switch from being turned off, and the reverse contactless switch to guide Generally short circuit between phases. The main circuit of the rotor is controlled by the three-phase fixed metal resistance and the non-contact variable resistance starter. After the non-contact switch of the stator main circuit is controlled by the control board, the IGBT is periodically turned on and off to make the series The resistance into the motor rotor circuit changes steplessly from large to small to complete the stepless smooth start of the motor. The Hall current transformer is installed through the main circuit of the stator for sampling and sent to the control board. If the motor has over-current, overload and phase failure, the control board issues a stop command and sound and light alarm. The motor stator circuit is provided with fast fuse protection, the non-contact switch and the IGBT module are provided with resistance-capacity absorption protection. Various protection commands of the control circuit, such as voltage protection and cooling fan protection, are input to the control board, and are executed by the control board software.
Taking into account dust protection requirements, increase the distance between contactless switches, especially forward and reverse modules, to prevent creepage, and install a dust cover. Both the contactless switch and the IGBT are heating elements, which are mounted on a flat radiator and cooled by bottom-blowing positive pressure ventilation.
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