JP3068029B2 - Magnetization detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetization detecting device for detecting a magnetized state from a magnetizing current when magnetizing a magnet used in a motor or the like.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing an example of a conventional magnetizing device. As shown in FIG. 7A, this magnetizing device includes a capacitor 1 for storing electric charges and a yoke coil 6 for storing the electric charges.
A thyristor 3 serving as a switch for flowing the
It includes a coil 2 for protecting the thyristor 3, a diode 4 for returning a back electromotive force generated in the circuit in a forward direction, an output terminal 5 for outputting a current, a yoke coil 6, and the like. (See Japanese Patent Application Laid-Open No. 2-177306).

Then, by applying an arbitrary voltage, electric charges are accumulated in the capacitor 1, and a pulse voltage is applied to the gate of the thyristor 3 to turn on the thyristor 3, thereby causing a current to flow through the yoke coil 6, Magnetic force was generated. At this time, this magnetizing current is
As shown in (B), from the beginning of the current flow (t0), the peak of the current value (t1) elapses, and the current stops flowing through the point (t2) where the back electromotive force (kickback) occurs. (T3).

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Laid-Open No. 2-1 has been described.
No. 77306 discloses that the electric energy required for magnetization is up to the peak point (t1), and the current from the peak point (t1) to the kickback point (t2) is controlled to control the yoke coil 6 for magnetization. Trying to protect.

However, according to the study of the present inventor, according to the magnetizing device of each company, even if the same peak current is applied, the state of magnetization differs depending on the device, and the performance changes. There was a problem.

An object of the present invention is to provide a magnetization detection device capable of detecting magnetization performance by setting a new parameter indicating a magnetization state of a magnet.

[0007]

According to a first aspect of the present invention, there is provided a current measuring means for measuring a magnetizing current for magnetizing a magnet, and a method for measuring a magnetizing current based on a measurement result of the current measuring means. And a magnetizing current time product calculating means for calculating a time product while the magnetizing current is flowing.

[0008]

Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG.
1 is a block diagram illustrating an embodiment of a magnet detection device according to the present invention. The magnetization detection device 10 includes a detection coil 11A that detects a current flowing through an electric wire, an integrator 11B that shapes a waveform of the current detected by the detection coil 11A,
Current monitor terminal 12 connected to synchroscope etc.
A / D converter 13 for converting an analog signal from integrator 11B into a digital signal, and A / D converter 1
Oscillator 14 for giving a conversion start pulse to 3 every 10 μs
CPU 15 for calculation and control, 10 μs
16 for storing data sampled for each
And an I / O port 17 which is an input / output device such as a switch or an LED, a display 18 for displaying measured data (peak value, integrated value, etc.), and a personal computer (not shown). An output terminal (RS232C) 19, a power supply 20, and the like are provided for monitoring and confirming the operation.

FIG. 2 shows the CP of the magnetization detection device of the present embodiment.
FIG. 3 is a flow chart showing the operation of U, and FIG. 3 is a diagram illustrating the detection content of the magnetization detection device of the present embodiment. First, 10μs
In order to generate the conversion pulse, the timer SET is performed (S101), the end of conversion of the A / D converter 13 is detected (S102), and the data from the A / D converter 13 is fetched (S103). (S104). Here, it is confirmed whether or not a current is flowing (S105: start detection).
Returning to 02, if affirmative, the process proceeds to S106.

Next, the end of the conversion of the A / D converter 13 is detected (S106), the data from the A / D converter 13 is fetched (S107), and stored in the memory 16 (S108). This time, it is confirmed whether or not current is flowing (S109: end detection).
Returning to 106, if affirmative, the process proceeds to S110.

Next, a peak current is detected from the data fetched into the memory 16 (S110).
The total of the current values, that is, the time product (the current area indicated by the hatched portion in FIG. 2) is calculated from the data taken in (S11).
1) Finally, they are selectively displayed on the display 18 (S112).

FIGS. 4 and 5 show the relationship between the rotation angle and the magnetic flux of the magnetized magnets (samples 1 and 2).
FIG. 6 is a diagram showing the pulse current waveforms of FIG. 4 and FIG. 4 and 5 show the same peak current value Ip = 6.6 kA.
, But as shown in FIG. 6,
It can be seen that the area of (B) is larger than that of (A). That is, comparing the total Gauss of the magnets (Samples 1 and 2) magnetized at that time, it can be seen that the magnetization level is higher in FIG. 6B.

(Modifications) Various modifications and changes are possible without being limited to the embodiment described above, and they are also within the equivalent scope of the present invention. For example, by taking data from the output terminal 19 into a personal computer, information (peak current value, time, area) about an arbitrary point indicated by the cursor can be obtained as shown by cursor 1 and cursor 2 in FIG. .

[0014]

As described in detail above, according to the present invention, by setting a new parameter representing the magnetized state of the magnet, which is the time product (current area) of the magnetized current,
The performance of the magnetized magnet can be accurately grasped.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetization detection device according to the present invention.

FIG. 2 is a flowchart illustrating an operation of a CPU of the magnetization detection device according to the embodiment;

FIG. 3 is a diagram illustrating the operation of the magnetization detection device of the present embodiment.

FIG. 4 is a diagram showing a relationship between a rotation angle of a magnet of sample 1 and a magnetic flux.

FIG. 5 is a diagram showing a relationship between a rotation angle of a magnet and a magnetic flux of a sample 2;

FIG. 6 is a waveform diagram showing a pulse current waveform of the magnet of FIGS. 4 and 5;

FIG. 7 is a diagram showing an example of a conventional magnetizing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Magnetization detector 11A Detection coil 11B Integrator 12 Current monitor terminal 13 A / D converter 14 Oscillator 15 CPU 16 Memory 17 I / O port 18 Display 19 Output terminal (RS232C) 20 Power supply

Claims (1)

(57) [Claims] 1. A current measuring means for measuring a magnetizing current for magnetizing a magnet, and a product of time between the magnetizing current and the flowing of the magnetizing current based on a measurement result of the current measuring means. And a magnetizing current time product calculating means for calculating the following.