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Pm motor position-sensorless control device

A control device and sensor technology, applied in the direction of controlling electromechanical transmission devices, control systems, and generators, etc., can solve the problems of less magnetic saturation, inability to operate correctly, and inability to apply

Inactive Publication Date: 2014-04-16
MEIDENSHA ELECTRIC MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot be applied to PM motors with non-salient pole machine characteristics. In addition, there are two polarities of N pole and S pole on the excitation pole axis (d axis), so in order to distinguish them, it is necessary to add Additional Magnetic Pole Discrimination Method Utilizing Magnetic Saturation, etc.
[0009] That is to say, the former method of estimating electromotive force cannot operate correctly in the low-speed range, while the latter method of superimposing high-frequency can perform operation in the low-speed range, but the applicable motors are limited, and it cannot be applied to motors with In the case of salient pole machine characteristics, PM motors with less magnetic saturation

Method used

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  • Pm motor position-sensorless control device
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  • Pm motor position-sensorless control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] figure 1 A block diagram showing the position sensorless control device according to the first embodiment of the present invention is shown. 1 is the inverter controlled by PWM, and 2 is the PM motor. Here, the excitation axis of the N pole of the PM motor of the actual machine is defined as the d-axis, while the phase that advances 90° in the forward direction is defined as the q-axis. . However, since there is no position sensor, the d-axis and q-axis cannot be directly detected. Therefore, the N pole axis assumed by the magnetic pole estimation is defined as the γ axis, and the phase advancing 90 degrees in the rotation direction is defined as the δ axis.

[0055] 3 is a rotating coordinate conversion unit, which inputs the three-phase current i detected by the current sensor u i v i w And the coordinates are transformed to i as the estimated axis γ i δ . Current signal i after coordinate transformation γ i δ are input to the current differential detection...

Embodiment 2

[0082] figure 2 represents a 2nd embodiment, with figure 1 The difference of the first embodiment shown is that the current differential information pi' is obtained by installing the current differential detection unit 11 in the fixed coordinate system. γ 、pi' δ .

[0083] In the first embodiment, in order to obtain the current differential information correctly, the estimated phase θ^ used in the rotational coordinate transformation must also be a value of the continuous system. Therefore, when the three-phase current signals are A / D-converted into digital values, the estimated phase θ^ used in the rotational coordinate conversion also needs to be updated sequentially, which increases the amount of computation. This embodiment 2 takes this point into consideration, by being configured to obtain the current differential information pi' in a fixed coordinate system γ 、pi' δ , it becomes unnecessary to update the estimated phase θ^ successively, and a simple calculation c...

Embodiment 3

[0112]In Examples 1 and 2, the induced voltage was calculated using the current differential during the zero voltage vector period. Embodiments 1 and 2 are characterized in that they are not affected by dead time, operation delay of the switching element, etc., because the current change during the period in which the switching element used in the inverter is not operating is detected. However, when the switching elements are strictly implemented by semiconductor elements such as IGBTs and diodes to form an inverter, the inverter output voltage does not become zero during the zero-voltage vector period due to the voltage drop of each element. .

[0113] This embodiment considers this point and constitutes as image 3 as shown.

[0114] Generally, since the voltage drop component of the switching element has a relationship with the current, the voltage drop amount of the semiconductor element is estimated and corrected based on the detected value of the current component of e...

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Abstract

In a PM motor position-sensorless control device, an estimation phase is not accurately estimated in a low speed region. Provided is an induction power calculation unit in which a current detection value at a coordinate gamma-delta during a zero voltage vector period and current differential information are input and speed electromotive forces e gamma, e delta are calculated. The calculated speed electromotive forces e gamma, e delta are input into a rotation speed estimation unit, estimated speed Omega^ is determined, and by performing time integration of the estimated speed, estimated phase Theta^ is calculated.

Description

technical field [0001] The present invention relates to a position sensorless control device of a PM motor, and relates to a sensorless control device capable of estimating induced voltage from current using differential information when the PM motor is running at low speed, and estimating the rotation speed / magnetic pole position using the estimated voltage. Background technique [0002] With the improvement of the performance of the magnet, a synchronous motor (hereinafter referred to as a PM motor) using a permanent magnet without a brake (damping) winding as an excitation source is available for practical use. For servo applications and the like, position information of rotor magnetic poles is required for variable speed control of the PM motor. However, many sensors that detect this positional information have built-in electronic components such as semiconductor elements, and there are problems in environmental resistance and durability due to the low mechanical strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P6/16H02P27/04H02P6/18H02P6/06H02P6/08H02P6/17H02P6/182H02P6/28H02P21/14H02P21/18H02P21/22H02P21/24H02P21/28H02P23/14H02P23/16H02P27/08
CPCH02P21/0039H02P6/18H02P2207/05H02P2203/09H02P27/08H02P21/24
Inventor 泷口昌司小野梦树
Owner MEIDENSHA ELECTRIC MFG CO LTD
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