High-power-density motor controller

The invention discloses a high-power-density motor controller which comprises a direct-current input side connected with a direct-current bus of a high-voltage power distribution system, an alternating-current output side used for being connected with a U phase, a V phase and a W phase of a motor, and a motor control circuit connected between the direct-current input side and the alternating-current output side and used for achieving motor control. The motor control circuit comprises a plurality of groups of IGBT modules which are connected in parallel, a support capacitor and a discharge resistor; a current sensor is also arranged on the alternating current output side connecting line; the controller further comprises a box body, a shielding supporting plate with a transverse T-shaped section is arranged in the box body, and the T-shaped shielding supporting plate divides an inner cavity of the box body into a direct current strong current area arranged on the outer side of a T-shaped short plate, an alterna