A motor servo controller and its control method

A technology of servo controller and control method, which is applied in the direction of AC motor control, motor generator/starter, starter of a single multi-phase induction motor, etc. problem, to achieve the effect of improving the dynamic response speed

Active Publication Date: 2020-08-07
DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The pitch control device disclosed in this patent document is equipped with a pulse width modulation charge and discharge circuit in the servo motor driver. Although it can charge and discharge the supercapacitor, when it is completely powered by the supercapacitor, the speed will be reduced due to the drop in the discharge voltage of the supercapacitor. Decreased control accuracy affects the working stability of the entire pitch control device

Method used

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  • A motor servo controller and its control method
  • A motor servo controller and its control method
  • A motor servo controller and its control method

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Embodiment 1

[0041] see Figure 1-Figure 3 , a motor servo controller, including a servo motor, a backup power supply, a soft start circuit, an unloading circuit and a rectification circuit connected to an alternating current, is characterized in that: it also includes a pulse width modulation inverter bridge and is used to give the backup A DC-DC half-bridge soft-switching high-frequency circuit for power supply charging and discharging. The DC-DC half-bridge soft-switching high-frequency circuit includes a low-voltage side half-bridge circuit, a high-frequency transformer, and a high-voltage side half-bridge circuit. The low-voltage side half-bridge circuit The bridge circuit is connected to the high-voltage side half-bridge circuit through a high-frequency transformer, the backup power supply is connected to the low-voltage side half-bridge circuit, the high-voltage side half-bridge circuit is connected to the DC terminal of the pulse width modulation inverter bridge, and the pulse width...

Embodiment 2

[0052] A control method for a motor servo controller, comprising the steps of:

[0053] a. Overvoltage protection steps: during the power-on phase, the soft-start relay K1 is disconnected, and the power resistor R1 charges the DC bus capacitors C3 and C4. After fully charged, the soft-start relay K1 is closed; during the operation phase, the DC bus capacitors C3 and C4 When the terminal voltage reaches the set maximum protection threshold voltage value of the switching device T11, the energy is discharged through the power resistor R1 to complete the overvoltage protection;

[0054] b. The charging step of the backup power grid. When the backup power is insufficient, the DC-DC half-bridge soft-switching high-frequency circuit takes power from the DC bus, and converts high-voltage power into low-voltage DC through a high-frequency transformer to charge the backup power;

[0055] c. The energy feedback charging step of the backup power supply. When the energy needs to be transfe...

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Abstract

The invention discloses a motor servo controller. The motor servo controller comprises a servo motor, a standby power source, a soft startup and unloading circuit, a controllable rectification circuit connected to an AC power, a PWM inverter bridge and a DC-DC half-bridge soft switching high-frequency circuit; the DC-DC half-bridge soft switching high-frequency circuit comprises a low-voltage side half-bridge circuit, a high-frequency transformer and a high-voltage side half-bridge circuit; the low-voltage side half-bridge circuit is connected with the high-voltage side half-bridge circuit through a high-frequency transformer; the standby power source is connected with the low-voltage side half-bridge circuit; the high-voltage side half-bridge circuit is connected with the DC end of the PWM inverter bridge; the AC end of the PWM inverter bridge is connected with the servo motor; and the rectification circuit is connected with the DC end of the PWM inverter bridge. According to the motor servo controller, the standby power source can provide sufficient electric energy to the servo motor when the voltage of a power grid fluctuates, so that precision requirement of rotating speed control of a blade motor is guaranteed, and the working stability of a whole system is enhanced.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a motor servo controller suitable for a wind power generator pitch system and a control method thereof. Background technique [0002] The motor servo controller is an important part of the pitch system, which is also an important part of the wind turbine. All components of the pitch system are installed on the hub. speed rotation. The pitch system controls the speed of the wind rotor by controlling the angle of the blades, thereby controlling the output power of the fan, and can stop the fan safely through aerodynamic braking. The blades of the fan are connected to the hub through pitch bearings, and each blade must have its own relatively independent electronically controlled synchronous pitch drive system. The pitch drive system meshes with the internal teeth of the pitch bearing through a pinion. [0003] During the normal operation of the fan, when the wind s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/08H02J9/06H02P1/26
CPCH02J9/061H02P1/26H02P27/085Y02B70/30Y04S20/20
Inventor 闵泽生蒋驰雷陈辉何光俊向阳项勤建张甜甜
Owner DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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