Variable frequency inverter for low-speed and high-power magnetic suspension disk type synchronous motor

Abstract

The invention discloses a variable frequency inverter for a low-speed and high-power magnetic suspension disk type synchronous motor, and belongs to the field of motor control. The variable frequency inverter for the low-speed and high-power magnetic suspension disk type synchronous motor comprises a full-bridge frequency changer circuit module, a DC / DC chopper circuit module, a main control circuit module, a signal acquisition and conditioning module, a human-machine interaction interface and a current-voltage and air gap sensor. The full-bridge frequency changer circuit module supplies a three-phase alternating current which has a frequency as low as 0.1 Hz to a disk type motor stator in the mode that stator impedance compensates constant voltage frequency ratio control, and a slip form rotor position estimation method is adopted; the DC / DC chopper circuit module supplies a direct current exciting current which enables a disk type motor rotor to suspend and rotate to the disk type motor rotor; the main control module controls the DC / DC chopper circuit module and drives the disk type motor to run according to a scheduled control algorithm. According to the variable frequency inverter for the low-speed and high-power magnetic suspension disk type synchronous motor, suspension control and variable frequency driving control are integrated, a position sensor or a speed sensor is of no need, the applied power is small, cost is low, and the variable frequency inverter for the low-speed high-power magnetic suspension disk type synchronous motor is especially suitable for driving low-speed and large-torque magnetic suspension disk type synchronous motors.

Description

technical field [0001] The invention relates to a frequency conversion controller, in particular to a frequency conversion controller for a low-speed and high-power magnetic levitation disc synchronous motor, belonging to the field of motor control. Background technique [0002] At present, the power of the disc motor is small, the speed is high, and the iron core is difficult to manufacture and the cost is high. For the situation where low speed is required, a deceleration mechanism must be installed, resulting in complex system structure, many parts and low reliability, so it cannot be used for low speed and high torque occasions. Another important reason that restricts the development of low-speed, high-torque disc motors is that there is no matching frequency conversion controller. Contents of the invention [0003] The main purpose of the present invention is to propose a frequency conversion controller matched with low-speed and high-power magnetic levitation disc s...

AI Technical Summary

Problems solved by technology

[0002] At present, the power of the disc motor is small, the speed is high, the iron core is difficult to manufacture, and the cost is high.

For the situation where low speed is required, a deceleration mechanism must be installed, resulting in complex system structure, many parts and low reliability, so it cannot be used for low speed and high torque occasions

Another important reason that restricts the development of low-speed, high-torque disc motors is that there is no matching frequency conversion controller for it.

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