JPS5819188A - Variable frequency drive device for induction motor - Google Patents

Abstract

PURPOSE:To enable to steplessly shift the speed of an induction motor with a single phase power souce by generating a polyphase pulse altered in frequency in response to the signal for setting a rotating speed, thereby controlling the conduction of a switching element. CONSTITUTION:Respective terminals of stator coils W1, W2 of an induction motor IM are connected to one terminal of a single phase power source V through a neutral point C, and the other terminals are connected to the other terminal of the single phase power source V. The gate circuits G1, G2 are operated by 2- phase converter. The converter generates a polyphase pulse altered in frequency in response to the signal for setting the rotating speed, and the voltage having the same as the frequency of the polyphase pulse is applied from the single phase power source V to an induction motor IM.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving mechanism for the starting electric motor 11, and particularly to a driving device that changes the continuous rotation by making the number of liquids variable.

Conventionally, as a configuration for easily variable frequency driving of an sI-3/ml conductive exciter, a configuration as shown in the first part has already been known. MIIK$P? S is the AC voltage '@to'IHI, '□ shown in Figure 2, and the AC power supply S '1-'L '3 is an electric am element, IMa is passed through the above -m element. AC power gP
If you use a conductive motor for the drive II, and if you use the electric motor IN, -closed element 11.52.
53 is fully energized, and when re, the Fi motor IN rotates roundly with the AC power source 75t). Note @2
1!10#Threshold voltage O armpit type 1-6 扛斃生1IAIl. It is best to thin out the #IL glue 1 to 60 basic axillary shapes by keeping the order of the shadows of the pigeon house 11m rotating at low speed constant, for example, by applying each IIl shadow to the electric motor IN twice in succession. In the 7th night game, the same numbered tIIL carving was on the wing again, and it was a 5/yo board speed and h.

According to the umbrella structure of Jin, the multi-speed operation of Ell's electric-O becomes easy, but with this, '/l, '/*s'O#
A-transmission transmission - Rie There is a disadvantage in C1 that the speed is changed steplessly from the staged fishing umbrella change and shield, and the oO transition.

The object of the present invention is to use a single-phase power source to make it possible to continuously change the speed of an II induction motor.

This invention generates a multiphase pulse whose jII number is changed according to the O number for determining Fi rotational interference, and the same jII1wl number O voltage as the ζO multiphase pulse is applied to the induction motor from a single-phase power supply. It is characterized in that it controls the opening and closing operation in this manner. In this case, it is necessary to change the applied voltage as well as change the rotation speed O, but in this invention, the applied voltage is also made variable so that the ratio of the applied voltage to one frequency is always constant. It is characterized by four things.

From ζO @01i! 111 examples will be explained using diagrams g3 onwards.Although the illustrated example is intended for a biphasic conductive motor, it is not limited to this, but can also be applied to three-phase and other Ogk phase 0 * conductive motors. Even in the platform where I say “Kurohi” and “Ki”,
sI-ite r mine single-phase power supply in Yuki 3a, IMuume tmm,'
1e '2'' So0llll constant winding-1 THI, 712 switch opening/closing element nine-way bidirectional thyristor (hereinafter simply referred to as thyristor*) s '1, '2 #i Dart to fire the star It is a road. Isoshisha Line '1e'
One end of each of the two terminals is connected to one end of the single-phase electric power ro through the neutral point C, and the other end is connected to the single-phase electric power ro tawc through the terminals T11 and 112. Kaigut circuit G1.52 Two-phase Zumper circuit c shown in Hiro No. 411
Operated by r.

At the 4th garden, the 1st block Jl detector outputs an analog pda voltage (hereinafter referred to as Okaji) according to the dispersion level. A voltage of 6 is applied to the pulse train 2, which outputs a pulse train l of frequency according to the value of O, and a pulse train j#/i of 2 is applied to the path 3, where The two-phase pulse x C1, C2, which has a 90IIO phase and has a low voltage @, is also input to Bl&4. A phase control pulse l whose pulse width is proportional to the single-phase voltage VO voltage #KM is output.

Two-phase power k . Said - Road 5g, 5 other person O input Ka power supply AJl
An O power synchronization pulse d is applied from the lllll path 6.

Goo) Drive-Route 7 Hiroshi AND circuit 7m, Takeshi Sakaki from 74, its fL exclusive-Houwa-Road 58. Outputs -1 and -2 from 56 are seen as 4 O inputs. For,
Also, a phase control pulse f is given to the O input. Then, the dart drive pulse t1.12, which is the output pulse from each circuit 7g, 7k, is turned on (G1, 52).
Enter g.

When the drive pulse 11@12, which is the output from the circuit G1, 62 and the circuit 71.7, is input, the thyristor T11. TW2 conducts, and during that period, single m'
llk l' tD Electric E 曾#4HIIIF1, F
2 K+Electric E 41.

A2() supplies the diagonal of K so that it is applied as nine voltage portions 6. If you look at the average voltage of A20ICIEII/4, it is a two-phase voltage with the relevant phase and angle being 90 degrees, and this increases by applying LF2K to the motor in one direction. K to rotate.

If the life rate setting 1111 is set to reduce the rate of mold, the anadami pressure will decrease to 4 as %ζJ'L increases. As a result, the pulse train 10
Since the j1 period becomes longer, the two-phase pulse (Rus C1° C2 () period becomes the longest (). On the other hand, since the single gripping electric @rolB wrinkle number is constant, and the A Rus ieagas is constant, the two-phase pulse ' During one period of L'2, IIc strange pulse -1, -# of striking
I am very humbled. Two-phase pulse C1, C2C4)
During the middle period, the voltage -O positive
@ is a lot (attacks, so as a result IIIFl, FzK mark -
Awful voltage OJF restrained chest wrinkle number line low umbrella and electric power IM
The tJ11 rotation number becomes smaller. When trying to increase the reverse K11 transition, the voltage s company < 1 伽, due to the operation of the above-mentioned Shira and 0iIi, two-phase a#Jcl, C2K) 14114
ul < Umbrella! Conclusion 1. Fist m'l.

W2Kfe1m* The voltage O is flat and the number of chest wrinkles is low.

On the other hand, if the voltage is small tk') and the pulse train 10II is long, then both the voltage and k become 1') and the phase control pulse fOA
The rounding gate drive pulse 11,
120 pulse width also has a value (becomes conductive [I1゜42 ()
Voltage submin ha value is small'& sand, as a result 轡@Fl
, F21c is applied, so the average voltage value increases or decreases. If the voltage is loud, the reverse operation will cause 'In'
-'1 The average voltage value applied to m'2 becomes louder. Generally, mwtt determines the electric @IN@Q rotation number.
It is necessary to maintain constant values of ity, the voltage r applied to the ringing bell, and the voltage 14. In this respect, as can be understood from the above explanation, when the voltage II changes, the winding d turns g Fl , F2
Since the voltage applied to K changes in the same way, K allows the resistor 2 to maintain a constant value of 1tK even if the rotation speed is changed.

1ks? Motor IMt) @ Km to reverse the direction of rotation, the phase difference of the two-phase pulses C1 and C2 should be changed by 160 degrees, and the relative %/% is the drive pulse 11. It's a dirt road to I2 and my sisters.
'1, the polyphase induction motor is
In the case where the invention is applied, instead of the two-phase pulse '1 t '2 K, a multi-phase pulse with the same number of phases as the motor may be used. Use a three-phase pulse (1 degree in position @lli).

As detailed above, according to ζOIi, in order to control the variable speed of a conductive motor, it is possible to change the number of peripheral fluids to a rate of 1* with a simple 1k1 circuit configuration. ″e
It is effective to use both the variable speed and variable speed for variable speed fishing.

Umbrella is applied to human J@@, and the induction motor mine is several tens of R, 1 degree, and 0 is also suitable for Nago,! - Suitable for use in key motors used in machine 11I models.

[Brief explanation of the drawing]

111th Hiro Conventional Example Oml 路浬, Iris 2 Pavilion Mine Power Liquid Fist Diagram, Part 1! Figure 1 - 4 shows an example of a collection of essays. be. r...single power supply, TM...-conduction motor 1C...
...neutral point s rl, F2. ,,-41L ff1.
ff2.・,,I41xp (-WIi bulky)% example, to...goo) -ro%1...moderate setting -% fse
*s* two-phase road, 4 seam phase sea bream road, 5 se
am: ln J'E-11kl road% 4 maam
11 source pIlsa path, y... dart drive Il path

Claims (1)

[Claims] 轡-〇The neutral point of the induction motor is connected to the single-phase electric current I [〇One end, and the other end of the two wires is connected to the single-phase electric current IIO end through the switching element 4, which is controlled to open and close, respectively. When connected, outputs a multi-phase pulse whose period is determined according to the setting level of the electric power source O, a power cycle pulse synchronized with the single-phase power source O voltage, and a 0# personal power source output at 4%. road and said;
Dirt drive that outputs the AND output of the exclusive OR output of the output voltage and the phase lll1# pulse whose pulse width is changed by increasing the voltage of the single-phase power supply and changing the pulse width according to the setting of the tii. From Kaibu to tk! +, Variable JI11 wave number drive value of the casting machine, which is made to conduct by the output pulse of the gate drive short circuit.