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Synchro motor drive device

A technology for synchronous motors and driving devices, which is applied in the control of electromechanical transmission devices, motor generator control, AC motor control, etc. Rotation, to avoid the effect of torque ripple

Active Publication Date: 2012-08-29
HITACHI IND PROD LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the conventional technology, torque ripple occurs due to the superposition of higher harmonics, which may be affected by mechanical resonance, etc., making it difficult to start smoothly
In addition, in the case of using significant polarity, for example, in the case of a synchronous motor with a damper winding, the significant polarity decreases due to the influence of the damper winding, making it difficult to apply the conventional technology
In addition, in the case where voltage detection is required, it is easily affected by voltage detection errors at low speeds
Furthermore, the control phase error caused by the above-mentioned higher harmonics and voltage detection error may sometimes cause the motor to reverse, and when the angle that can be reversed is limited due to mechanical constraints, it will cause problems.
In addition, in the design of the speed control system and the speed estimation system, the constants of the motor and the mechanical system are required, and it is difficult to apply them if they cannot be clearly grasped.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] use Figure 1 to Figure 3 , for the induction motor driving device of this embodiment and Figure 10 The parts different from the prior art will be described. In addition, what is involved here is the control method from starting to accelerating to a given speed. In the torque command value setting section 1, let the torque command value It corresponds to acceleration torque + load torque, and is set to, for example, about 60% of the rated torque. Next, in the current command computing unit 105, the torque current command It is set * = given value, excitation current command Im * =0. Since the magnetic flux is generated by the field current of another field device, it is generally controlled so that Im=0. At this time, the current Id, Iq, magnetic flux Φd, Φq, and generated torque of the synchronous motor 102 , as shown in (Formula 2) to (Formula 6), respectively. In addition, the phase difference for Figure 11 The phase deviation between the d-axis and the...

Embodiment 2

[0036] Differences between this example and example 1 will be described. In this embodiment, the phase correction value Δθ is gradually changed by degrees such as 90° or 45°, or 30°, or 10° below 90°. By doing this, the rotation becomes smoother.

Embodiment 3

[0038] use Figure 4 , the differences between this embodiment and Embodiment 1 and Embodiment 2 will be described. Figure 4 In, relative to Example 1 image 3 Therefore, the time t1 for setting the phase correction value Δθ to the initial setting value is shorter than the time t2-t1 and t3-t2 for changing the phase correction value Δθ thereafter. This is because, Figure 11 In the case where the t-axis (current axis) and the d-axis (magnetic pole axis) are shifted by 180°, starting cannot be started, and demagnetization is caused by the t-axis current, so the phase correction value Δθ changes and the t-axis When the (m-axis) is moving, it may not start due to demagnetization. In addition, the reason why it can start within t1 is that it is close to the phase correction value , Next, when the phase correction value Δθ moves by 90°, it is still in the startable range, as long as the demagnetization of the initial phase correction value Δθ is prevented. In this embodiment...

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PUM

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Abstract

The invention provides a synchronous electromotor driving device which smoothly starts an acceleration synchronous electromotor without speed and a position speed, and restrains reversion. The synchronous electromotor driving device of the invention controls magnitude, frequency, phase of an output voltage, addes a gived phase corrected value to the phase when a synchronous electromotor is started, modifies the phase corrected value more than once, and corrects the frequency or phase based on a detection value of an output current. In addition, when the phase corrected value is modified, the phase is increased at a positive rotation direction of the electromotor, for example, gradually incresed to lower than 90 degrees. Morever, when the gived phase corrected value initially modified, a time setting an initial phase corrected value is shorter than a time setting a modified phase corrected value.

Description

technical field [0001] The present invention relates to a motor drive device for variable-speed operation of a synchronous motor, in particular to a motor drive device for starting and accelerating a synchronous motor without using speed and position sensors. Background technique [0002] In the speed and position sensorless control of synchronous motors, there has been a kind of superimposed high-order harmonics on the output current or output voltage, using the inductance in the magnetic flux axis (d axis) and the axis (q axis) perpendicular to the magnetic flux axis The difference between (Ld, Lq) is used to detect the speed or magnetic pole position. Figure 10 In , the technology of Patent Document 1 is shown as a prior art. In addition, although Figure 10 Among them, the synchronous motor is a permanent magnet type synchronous motor, but if a winding type synchronous motor with a magnetic field device is used, the operation is the same. In the speed control unit 103,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P6/18H02P27/04H02P6/06H02P6/08H02P6/182H02P6/28H02P21/22H02P21/34H02P23/16
Inventor 永田浩一郎奥山俊昭根本治郎片山敏男秋田佳稔
Owner HITACHI IND PROD LTD