Motor controller, motor assembly and vehicle

The utility model discloses a motor controller, a motor assembly and a vehicle, the motor controller comprises a driving board and a bus capacitor, the driving board is provided with an electronic component, the bus capacitor is provided with an accommodating groove, and at least one part of the electronic component is accommodated in the accommodating groove. According to the motor controller provided by the embodiment of the utility model, the accommodating groove is formed in the bus capacitor, and the electronic component on the driving plate can be matched with the accommodating groove to form a limiting relationship, so that the positioning installation of the bus capacitor and the driving plate is realized, and the installation efficiency of the controller is improved.