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Torque motor control method

A control method, torque motor technology, applied in the field of torque motor control, can solve problems such as unstable output torque, and achieve good control effect

Active Publication Date: 2017-06-27
HANGZHOU ZHISHAN INTELLIGENT CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above problems and provide a control method for torque motors; it solves the technical problems existing in the prior art that are easily affected by grid voltage fluctuations, resulting in unstable output torque, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A control method for a torque motor, comprising the following steps:

[0048] S1: Use SVPWM control to control the motor to reduce torque fluctuation;

[0049] Preferably, the SVPWM control adopts the SVPWM closed-loop servo control, such as figure 1 As shown, the point pointed by S is the bus voltage sampling point, the SVPWM closed-loop servo control consists of a double H-bridge to form a full-bridge inverter circuit, Q 1 Q 2 Q 3 Q 4 Powering Phase A, Q 5 Q 6 Q 7 Q 8 Power supply for phase B, the two phases are independent of each other, and can be controlled by SVPWM. Q 1 Q 4 Using the same PWM control signal, the Q 2 Q 3 adopted with Q 1 Q 4 In contrast to PWM control, each phase winding needs two PWM control signals, and the two-phase winding has exactly 4 PWM signals.

[0050] When Q 1 Q 4 When turned on, Q 2 Q 3 When it is turned off, the phase A winding is connected to a positive voltage and flows a positive current. Taking phase A as an exa...

Embodiment 2

[0099] This embodiment is similar to Embodiment 1, the difference is that the voltage compensation technology of this embodiment uses an intelligent compensation integrated device with a central control chip that can automatically perform voltage compensation according to the corresponding per-unit value to perform voltage compensation:

[0100] 220V AC power corresponds to the DC bus voltage V dc is 310V, but under actual working conditions V dc It will change with the fluctuation of the power supply voltage, so the per-unit value of the voltage corresponding to the central control chip also needs to be adjusted.

[0101] Example: If a voltage of 100V needs to be output, the per unit value is represented by 100 / 310=0.323 in the central control chip. If the power supply voltage fluctuates, the collected bus voltage becomes 290V. At this time, 0.323 cannot represent 100V. Only 93.67V, need to adjust the voltage output value.

[0102] Solution: The coefficient of bus voltage c...

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Abstract

The invention provides a torque motor control method and belongs to the field of motor equipment. The torque motor control method solves a technical problem that output torque is not stable for being susceptible to the fluctuation of power grid voltage in the prior art, and comprises the following steps of: S1, controlling a motor by using SVPWM closed-loop servo control to reduce torque ripple, wherein the step S1 further comprises: S2-1, converting a static coordinate system into a rotating coordinate system to completely decouple two phases; and S2-2, subjecting the DC component output by a current regulator in the rotating coordinate system to coordinate inverse transformation to obtain an AC component in the static coordinate system; and S2, subjecting bus voltage to sampling detection by using a bus voltage sampling circuit, and compensating the output voltage to ensure the accuracy of the output voltage. The torque motor control method can reduce torque ripple and improve the accuracy of the output voltage.

Description

technical field [0001] The invention belongs to the field of motor equipment, and in particular relates to a control method of a torque motor. Background technique [0002] Torque motors are usually used as lifting motors for flat knitting machines, but traditional flat knitting machine lifting motors, namely torque motors, work in open-loop mode, which is prone to unstable output torque due to fluctuations in grid voltage, which affects the quality of the knitting. bad; Secondly, because the bus voltage is easy to fluctuate, it will eventually cause fluctuations in the motor and affect the processing quality. [0003] In order to solve the above technical problems, the Chinese patent discloses an electromagnetic torque motor and its control method [Application No.: CN105024589A], which includes a rotor and a stator, and the rotor is connected with a phase detection mechanism, which is characterized in that: the rotor includes at least one set of annular Arranged central pe...

Claims

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Application Information

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IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 王刚志燕婧婧
Owner HANGZHOU ZHISHAN INTELLIGENT CONTROL TECH