Variable-frequency and variable-speed motor

The invention discloses a variable-frequency and variable-speed motor comprising a motor body, a heat radiator and a frequency converter electrically connected with the motor body, wherein the frequency converter comprises a master control board, a driving board and a power element which are electrically connected; the variable-frequency and variable-speed motor is an assembly of the frequency converter and the motor body; and the heat radiator is arranged on an end cap at the tail of the motor body and comprises a cap body and an containing part with an opening at one end, wherein the cap body is arranged at the opening of the containing part, a containing cavity is formed between the cap body and the containing part, heat radiating fins are formed at the outer periphery of the containing part, the inner side of the cap body is provided with the master control board of the frequency converter, the bottom at the inner side of the containing part is provided with the driving board of the frequency converter, insulating boards are all arranged between the master control board and the cap body and between the driving board and the containing part, and the inner side periphery of the containing part is provided with the power element of the frequency converter. The variable-frequency and variable-speed motor can realize the effects of reducing the on-site used space and prevent overshoot voltage generated by a power wire of the motor from destroying the insulation of the motor and effectively reduces the radiation of electromagnetic waves.