JPS6225891A - Motor applying apparatus - Google Patents

Abstract

PURPOSE:To enable the titled apparatus to operate coping with two kinds of supply voltages by notching part of the sine waveform at high voltages. CONSTITUTION:When a winding at 100V is wound on a motor M0 and 220V is used as supply voltage, a switch SW2 connected to control resistance terminals Rh, Re for a waveform control circuit C-C is kept under the state of opening at the 220V side. A Triac T.R is turned ON at that time when the time passes for not less than the half of a 220V AC half-wave, and the motor is given supply voltage. When 100V is employed as supply voltage, on the other hand, the changeover switch SW2 is turned ON to the 100V side, the side where a high resistor Rh is short-circuited. The time when the Triac T.R is turned OFF is hardly taken at that time, 100V of an approximately complete sine wave is given to the motor.

Description

Detailed Description of the Invention The present invention provides two types of power supply voltages: a sine waveform for low voltages, and a high voltage waveform with a part of the sine waveform cut out for high voltages. Substantially, the same effect as applying a low voltage waveform is obtained.

One example is a two-speed phase advance capacitor induction motor (hereinafter referred to as C
- Explain the use of high- and low-voltage power supplies (referred to as motors).

FIG. 1 shows a wiring diagram of the C-motor winding and capacitor C1 selector switch SW. Changeover switch 0αrt Official side mIJ Tr officer 7L Power is supplied to the 2-pole auxiliary winding 2 via the 10th winding 1 and the capacitor C, the 4-pole winding 3 is disconnected, and the motor MO operates at high speed. It becomes driving. Contrary to the above, when the changeover switch SW is switched to the low speed side, the 2-pole winding is disconnected and the power supply voltage e is changed to the 4-pole main winding 3.
Power is supplied to the 4-pole auxiliary winding 3B via A and the capacitor C, and the motor MO rotates at a low speed. In this way, the C-motor, which can be switched between high and 7 low speeds, is connected to two different power supply voltages, e.g.
Waveform control circuit 0 for use with both 0V and 220V
Figure 2 shows the connections of the two types of power supplies, high- and low-speed winding selector switches, capacitors, and control circuits that are connected to -C (see Figure 2).

A basic block diagram of the waveform control circuit 0-C in which the power supply voltage in FIG. 2 is applied to the input terminals el and e2 of the waveform control circuit C-C via the switch SW3 will be explained. One end of the input voltage enters through the e1 terminal and is directly connected to the motor terminal Ml, but triacs T and R are interposed between the other input terminal e2 and the motor terminal M2.
When the conduction is soft, "r" means that the input voltage from the input terminal e2 is the power supply voltage via the motor input terminal M2.

and generates driving force for the electric iMo. When triacs T and R are disconnected, one side of the power supply voltage input line is disconnected between input terminal e2 and motor terminal M2, and motor M
No input voltage is applied to O.

A resistor that controls the on and off of these triacs T and R;
Due to the high resistance Rh1 capacitor 〇g, when the charging voltage of the capacitor Cg reaches a certain voltage (approximately 8 volts), the triac T.

Trigger diodes T and D are responsible for opening the gate.
given by.

Now, if a 100v winding is applied to the electric motor M and the electric switch SW2 is kept open on the 220v side, in this case, the high voltage applied to the triac T and Ri charges the capacitor cg via the high resistance Rh. , the charging pressure is triac T,
If high resistances R and h are applied so that the time required to reach the R gate operating voltage of approximately 8V is more than half of the AC half-wave formation time, the triacs T and R will be turned off until more than half of the 220V AC half-wave has passed. When the time is more than halfway through, the triacs T and R are turned on and the power supply voltage is applied to the motor.

Shown below. When the input voltage is 0, triacs T and R are turned off. Triac T, R in motor current i.

The current 10 flowing through the motor M□ becomes 0, and the current flowing through the motor M is only the charging current of the minute capacitor 〇g -&1 and the current L2 flowing through the series circuit of the triac protection circuit 'RJo and co. There is a slight voltage rise due to the motor's resistance (including back electromotive force) when the current is combined. Point 0.28λ after more than half of AC half wave 0.5λ
, the charging voltage of the capacitor 〇g reaches the triac T and the gate starting voltage ζ, the triacs T and R turn on, the AC input terminal e2 is connected to the motor input terminal M2, and the complete AC voltage is applied to the motor. Given. In other words, the alternating current voltage is applied to the electric motor M,) at a half wavelength (0
, 5λ) of 0.28, λ, to 0.5. λ.

Next, FIG. 4 shows actual measured values for one wavelength of the current i flowing through the electric motor M. Between 0 and 0.28λ10, there is a weak current of LH+L2, and a high voltage is applied to the motor from 0.28λ-, but since the motor is an inductive load, the current rises and falls behind the voltage waveform, and the current is delayed. Half waveforms with a frequency approximately two or two times the power supply frequency appear intermittently on both the positive and negative sides. That is, the product of the voltage waveform in FIG. 3 and the current waveform in FIG. 4 is proportional to the power consumption at this time. This n is approximately 1/4.8 of the value obtained by multiplying the complete voltage sine waveform (220V) by the current sine waveform at that time. That is, 100V
This almost matches the power when a sine waveform is supplied to this motor. Therefore, even with a 220V power supply voltage, the same driving effect as a 100V power supply voltage can be obtained for the motor.

Next, when the power supply voltage is low (100V), the control resistance terminals Rj' and Rh of the waveform control circuit C-C are connected to the control resistor terminals Rj' and Rh. Cow, qW I n A V In other words, when the high resistance R and h are shorted, the control resistance becomes the low resistance R1! Then, the charging voltage of capacitor 〇g turns on triacs T and R in a very short time until the power supply voltage reaches nearly 10V from OV (see Figure 5).
As a result, there is almost no time during which the triacs T and R are turned off, and a nearly perfect sine wave of 100V is applied to the motor. The input voltage waveform of the electric motor at this time is as shown in FIG.

Therefore, as described above, the present invention has the effect of being put to practical use as a motor device that responds to two types of power supply voltages: 100V and higher voltage power supply.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram of a high-speed and low-speed capacitor motor when the power supply voltage is 100V, and Figure 2 is a wiring diagram of a high-speed and low-speed capacitor motor when the power supply voltage is 100V.
or a wiring diagram when using 220V as an alternative, Figure 3 is a voltage waveform diagram of the motor input when 220V AC is supplied, Figure 4 is a waveform diagram of the current flowing through the motor when 220V AC is supplied, and Figure 5 is a diagram of the current waveform flowing through the motor when 220V AC is supplied. Voltage waveform diagram of motor input when AC 100V power is supplied, 1 and 2 are main windings and auxiliary windings when 2 poles are used, 3 A and 3B are main windings and auxiliary windings when 4 poles are used, C-0 ...Waveform control circuit, MO...Electric motor, FLj
'...Low resistance, T, R...Triac, R, h.
...high resistance, Cg...capacitor, T, D...trigger diode, sw, sw□, SW2...switch.

Claims (1)

[Claims] An electric motor application device that converts a high voltage sine waveform into an intermittent positive/negative alternating half waveform by cutting out a part of the AC voltage input waveform every half wave, and responds to the high voltage that drives a low voltage motor.