CN202794489U - Iron loss detecting device for stator core of medium and small AC motor - Google Patents

Abstract

The utility model provides an iron loss detecting device for the stator cores of medium and small AC motors, which is characterized by comprising a secondary coil wound on the upper part of a stator core. Both a voltmeter and a secondary power supply are connected with the incoming and outgoing lines of the secondary coil respectively. A primary coil is wound at the right side of the stator core. An ammeter is connected in series with the incoming line of the primary coil. The primary power supply is connected with the incoming and outgoing lines of the primary coil. Two voltage terminals of a power meter are respectively connected with the incoming line and the outgoing line of the secondary coil respectively. Two current terminals of the power meter are connected in series with the outgoing line of the primary coil. According to the technical scheme of the utility model, when the iron loss detecting device for the stator cores of medium and small AC motors is in use, primary and secondary voltages are respectively applied to the primary and secondary coils of a stator core to simulate the actual operation process of a motor. In this way, a magnetic field is generated within the stator core so as to cause the iron loss. Then the iron loss factor of the stator core can be rapidly figured out according to the readings of the voltmeter, the ammeter and the power meter.

Description

A kind of middle-size and small-size ac motor stator core iron loss pick-up unit

Technical field

The utility model relates to a kind of middle-size and small-size ac motor stator core iron loss pick-up unit, belongs to motor detection technique field.

Background technology

The motor stator-core loss is one of motor five lossies.The fluctuation of manufacturing process unshakable in one's determination can cause the stator core loss higher, causes motor stator temperature rise or efficient defective.If motor finds that when delivery test open circuit loss is caused by the core loss height unusually, and is then more difficult, will cause stator to be scrapped when serious.For fear of waste of raw materials, improve product percent of pass, detect in the greenware condition stator core that loss is large and be very important.

Summary of the invention

The purpose of this utility model provides a kind of device of stator core iron loss that can the middle-size and small-size alternating current generator of fast detecting.

In order to achieve the above object, the technical solution of the utility model provides a kind of middle-size and small-size ac motor stator core iron loss pick-up unit, it is characterized in that: comprise the secondary coil that is wound in stator core top, voltage table is connected the line that connects secondary coil with secondary power; It is right-hand that primary coil is wound in stator core, and reometer is series in the inlet wire of primary coil, and primary source connects the line of primary coil; Two voltage binding posts of power meter connect respectively inlet wire and the outlet of secondary coil, and two electric current binding posts of power meter are series in the outlet of primary coil.

Preferably, form 90 ° of angles between described primary coil and the secondary coil.

A kind of middle-size and small-size ac motor stator core iron loss pick-up unit that the utility model provides, come the simulated machine actual moving process by applying respectively primary and secondary voltage for the primary and secondary coil that is wound on the stator core, thereby produce iron loss in the inner magnetic field that produces of stator core, can calculate fast iron loss value unshakable in one's determination according to the reading of voltage table, reometer and power meter.

Description of drawings

A kind of middle-size and small-size ac motor stator core iron loss pick-up unit synoptic diagram that Fig. 1 provides for the utility model.

Embodiment

For the utility model is become apparent, hereby with a preferred embodiment, and cooperate accompanying drawing to be described in detail below.

A kind of middle-size and small-size ac motor stator core iron loss pick-up unit that Fig. 1 provides for the utility model, described a kind of middle-size and small-size ac motor stator core iron loss pick-up unit is comprised of voltage table 1, secondary power 2, secondary coil 3, power meter 4 primary sources 5, reometer 6, primary coil 7 and stator core 8.

3 one-tenth 90 ° of angles of primary coil 7 and secondary coil are wound on respectively the right-hand and top of stator core to be detected 8.Voltage table 1 is connected the line that all connects secondary coil 3 with secondary power, reometer 6 is series in the inlet wire of primary coil 7, and primary source 5 connects the line of primary coils 7.Two voltage binding posts of power meter 4 connect respectively inlet wire and the outlet of secondary coil 3, and two electric current binding posts of power meter 4 are series in the outlet of primary coil 7.

The number of turns W of primary coil 7 ₁Numerical value obtained by formula (1):

$W_1=\frac{\mathrm{\π}\·D_c\·{\mathrm{at}}_c}{\sqrt{2}{I}_{1s}}---\left(1\right)$

D wherein _cBe stator core 8 yoke section mean diameters; At _cBe magnetic field intensity, tabling look-up by the siliconized plate trade mark of stator core 8 correspondences obtains; I _1sFor setting electric current, set according to the specification of stator core to be detected 8; W ₁Get and be not less than 3 integer.

The initial value primary voltage U of primary source 5 ₁Obtained by formula (2):

$U_1=\frac{W_1\·S_c\·k_B}{45}---\left(2\right)$

S wherein _cBe stator core 8 yoke section areas; K _BClose at stator core 8 yoke section magnetic is 10000G _sThe time get 1, close at rear of core magnetic is 12000G _sThe time get 1.2.

Secondary coil 3 number of turns are obtained by formula (3):

${\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="HDA00001862133800011.png"\; state="\{\{state\}\}">W</figure-callout>}}_2=\frac{U_2}{U_1}{W}_1---\left(3\right)$

Secondary voltage U wherein ₂Be the initial value of secondary power 2, generally get 20～70 volts.

During test, at first 5 pairs of primary coils 7 of primary source apply primary voltage U ₁, 2 pairs of secondary coils 3 of secondary power apply secondary voltage U ₂, the simulated machine actual moving process, thus iron loss produced in the stator core 8 inner magnetic fields that produce.Adjust U ₁Value, the value that makes reometer 6 is for setting electric current I _1s, then every the reading of 15 minutes record primary voltage tables 1, reometer 6, power meter 4, when continuous three numerical value differ when being no more than 5% off-test.Calculate stator core iron loss measured value according to formula (4)

$\stackrel{\&OverBar;}{W}=w\&times;\frac{U_1^{\&prime;}}{{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="HDA00001862133800011.png"\; state="\{\{state\}\}">U</figure-callout>}}_2^{\&prime;}}---\left(4\right)$

Wherein w is power meter 4 readings, U ' ₁For adjusting the voltage at rear primary coil 7 two ends, U ' ₂Reading for voltage table 1.

With reference to iron loss value p ¹ _cObtained by formula (5):

p ¹ _c＝1.3p _c·G _c (5)

P wherein _cBe unit weight iron loss, G _cBe unit area iron number, p _cAnd G _cAll table look-up by the siliconized plate trade mark of stator core 8 correspondences and obtain.

Stator core iron loss measured value

In theory less than reference iron loss value p ¹ _cIf,

Greater than p ¹ _c, must remeasure.

In addition, when utilizing this device accurately to detect middle-size and small-size ac motor stator core core-loss test, also must satisfy following condition: in motor test 1 hour, stator core 8 temperature rises are not more than 20 ℃, the difference of stator core 8 maximum temperatures and minimum temperature is not more than 15 ℃, the reading I of reometer 6 ₁Less than 300A.

Claims (2)

1. one kind middle-size and small-size ac motor stator core iron loss pick-up unit, it is characterized in that: comprise the secondary coil (3) that is wound in stator core (8) top, voltage table (1) is connected 2 with secondary power) all connect the line of secondary coil (3); It is right-hand that primary coil (7) is wound in stator core (8), and reometer (6) is series in the inlet wire of primary coil (7), and primary source (5) connects the line of primary coil (7); Two voltage binding posts of power meter (4) connect respectively inlet wire and the outlet of secondary coil (3), and two electric current binding posts of power meter (4) are series in the outlet of primary coil (7).

2. a kind of middle-size and small-size ac motor stator core iron loss pick-up unit as claimed in claim 1 is characterized in that: form 90 ° of angles between described primary coil (7) and the secondary coil (3).

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