In this chapter, the structure of the frequency conversion drive system of the elevator is described in detail, and the main circuit, control circuit and detection circuit of the drive system are studied in detail. Then, the direct torque control technology of permanent magnet synchronous motor and the direct torque control technology with space vector PWM technology are studied and analyzed in detail, and the diode clamped three-level inverter is also analyzed The device is studied in detail. Combined with the above technologies, the speed regulation performance of the elevator frequency conversion drive system has been greatly improved.