Monitoring device, bearing seat, air pump and transformer

The invention provides a monitoring device, a bearing seat, an air pump and a transformer, the monitoring device is suitable for the bearing seat provided with a bearing, the monitoring device comprises: a controller, wherein the controller is electrically connected with a driving part used for driving a rotating shaft of the bearing to rotate so as to control the movement of the driving part; and a sensor which is arranged on the bearing seat, is electrically connected with the controller and is used for detecting the vibration quantity of the bearing seat and transmitting a detection signal to the controller. The controller compares the vibration quantity of the detection signal with a preset vibration quantity range so as to judge that the bearing breaks down when the vibration quantity of the detection signal is not within the preset vibration quantity range and control the driving part to stop moving. The monitoring device solves the problem that no device for monitoring the state of the bearing of the g