CN1889355A

CN1889355A - Brushless DC motor noise reducing method for dish-washing machine

Info

Publication number: CN1889355A
Application number: CNA2005100143383A
Authority: CN
Inventors: 崔成奉
Original assignee: LG Electronics Tianjin Appliances Co Ltd
Current assignee: LG Electronics Tianjin Appliances Co Ltd
Priority date: 2005-06-30
Filing date: 2005-06-30
Publication date: 2007-01-03
Anticipated expiration: 2025-06-30
Also published as: CN100424983C

Abstract

This invention relates to an invention to washers applying new motors by increasing the usability of the current space of washers especially to a method for reducing noises of brushless DC motors after applying brushless DC motors, which enables the phase waveform corresponding to the cut-in voltages to be in conformity with that of the input current provided in the r/m of the brushless DC motor for driving the washing pump of the washer in order to provide washing water to spaying arms in the washing chamber by pumping.

Description

The brushless DC motor noise reducing method of dishwasher

Technical field

The invention relates to dishwasher, more detailed says so, and is the invention that becomes the brushless DC motor noise reducing method of possible dishwasher about the space more efficiently utilization that can make the washing chamber of placing tableware.

Background technology

Dishwasher with reference to 1 pair of prior art of accompanying drawing describes as follows.

Dishwasher is by to tableware jet cleaning water, thereby reaches the device of wash dining set purpose.

Dishwasher 1 comprises with the lower part and constitutes: place tableware, and the washing chamber 3 of washing; Be positioned at the bottom of washing chamber 3, be equipped with and the part of high-pressure wash water be provided for washing chamber 3, portion 5 is set hereinafter referred to as driving.

Washing chamber 3 and driving are provided with portion 5 to be described as follows.

The front of washing chamber 3 is provided with the door 7 that can open and close.Be provided with upper bracket 12 and the lower tray 14 that to place tableware in the washing chamber 3, but be respectively equipped with the upper spray 32 and the lower spray arm 34 of jet cleaning water in the bottom of upper bracket 12 and lower tray 14.Simultaneously, 3 bottom is provided with and can carries out to a certain degree the heater of heating 13 to washings in the washing chamber.

Be provided with in driving and be provided with the sink 9 that to accommodate washings in the portion 5, on sink 9, be provided with the washing pump that can make the washings suction and be transported to the upper spray 32 and the lower spray arm 34 of washing chamber 3.In general, sink 9 is connected by top connecting tube 322 and bottom connecting tube 324 with upper spray 32 and lower spray arm 34.

Also have, washing pump is made of with the impeller that is connected with motor 100 (not identifying in the drawings) the motor 100 that produces actuating force usually.Motor 100 is arranged on the side of sink 9.That is the axle of the motor 100 short transverse approximate vertical setting of dishwasher relatively.

The workflow of above-mentioned existing dishwasher is described as follows.

When dishwasher 1 work, the washings in the sink 9 are under the effect of washing pump, and suction is fed to upper spray 32 and/or person's lower spray arm 34 of washing chamber 3.Then, the tableware jet cleaning water that upper spray 32 and lower spray arm 34 will be placed on upper bracket 12 and lower tray 14, thereby wash dining set.Washings both can be fed to upper spray 32 or lower spray arm 34 separately, also can supply simultaneously.

The washings that are ejected on the tableware are recovered in the above-mentioned sink 9 again by the recovery holes (not identifying in the drawings) that is communicated with sink 9.At this moment, the washings that comprise foreign material behind the wash dining set can filter by certain filtration means.

But the dishwasher of above-mentioned prior art because it is big to drive the volume that portion 5 is set, exists to have and can't effectively utilize the height of washing chamber 3 or the problem in space, and its reason is described in detail as follows.

The first, the washing electric motor for pump in the prior art directly uses general inducing motor.But its aspect ratio is bigger, and like this, because the height of inducing motor, driving the height that portion 5 is set also will increase, and reduce the space utilization degree of washing chamber 3.

The second, the heater 13 in the prior art is arranged on the bottom of washing chamber 3.That is, heater 13 is arranged between the bottom surface of lower spray arm 34 and washing chamber 3.In order between the bottom surface of lower spray arm 34 and washing chamber 3, heater 13 to be set, must guarantee certain intervals, such interval is unnecessary space when 3 sides are seen from the washing chamber.

As shown in Figure 2, thereby require to have the motor height that reduces dishwasher to improve the dishwasher of the availability in space, washing chamber, therefore prompting uses the motor that is arranged on dishwasher to use the brshless DC motor 100 of coil mode.

But there are the following problems when driving the brshless DC motor of dishwasher use.

That is, when driving brshless DC motor 100, the value of input voltage relatively, the value of input current is later provides and causes the brshless DC motor overload, and then produces the problem of noise.

Summary of the invention

The present invention proposes in order to address the above problem, its purpose provides better space utilization degree for the dishwasher of prior art, adopt the dishwasher of new-type motor, particularly the brushless DC motor noise reducing method of the dishwasher of the noise of the brshless DC motor generation in the attenuating use new dishwasher after changing.

Reduce the motor height in order to reach, improve the purpose of the availability of washing chamber, the present invention is in order to be fed to each spray arm that is arranged in the washing chamber with washings by suction, and be provided with the brshless DC motor of washing pump, and to insert the phase waveform of the phase waveform of voltage and relative input current relatively consistent in the revolutions per minute of brshless DC motor be the brushless DC motor noise reducing method of the dishwasher of feature.

Make the input current with phase waveform identical with the phase waveform that relatively inserts voltage, the restriction by the identical lead angle (lead angle) of two phase differences realizes noise-decreasing.

At this moment, the restriction of above-mentioned lead angle uses a computer in the process of detection brshless DC motor performance after the goods assembling is finished and realizes.

Like this, when driving brshless DC motor, the phase waveform that inserts the phase waveform of voltage and relative input current relatively is unanimity, thus the noise of generation can reduce the brshless DC motor driving time.

Advantage and good effect: the effect of the brushless DC motor noise reducing method of dishwasher of the present invention is described as follows.

In the present invention, when making under the phase waveform that inserts voltage relatively and the corresponding to situation of the waveform of the phase place of relative input current the driving brshless DC motor by the restriction lead angle, can prevent the appearance of motor overload phenomenon, thereby reduce noise, also can reduce the consumption of electric power simultaneously.

Description of drawings

Fig. 1 shows an example sectional arrangement drawing of the dishwasher of prior art,

Fig. 2 shows another example sectional arrangement drawing of the dishwasher of prior art,

Fig. 3 is a flow chart of using the noise reducing method of brshless DC motor of the present invention,

Fig. 4 is a curve chart of using the phase difference of the access voltage of brshless DC motor of the present invention and input current,

Fig. 5 is the curve chart when using the access voltage of brshless DC motor of the present invention and input current phase place consistent state.

The symbol description of accompanying drawing major part

100: brshless DC motor, motor

Embodiment

Below the example of the present invention of realization above-mentioned purpose that can be concrete is described in detail with reference to the accompanying drawings.

Fig. 3 is a flow chart of using the noise reducing method of brshless DC motor of the present invention.

Fig. 4 is a curve chart of using the phase difference of the phase place of access voltage of brshless DC motor of the present invention and input current.

Fig. 5 is the curve chart when using the consistent state of the phase place of phase place and input current of access voltage of brshless DC motor of the present invention.

At this moment, V is for showing the phase waveform that inserts voltage relatively, and i is the phase waveform of relative input current.

Thereby the present invention is fed to each spray arm 32 that is arranged in the washing chamber 3 (with reference to Fig. 1) in the suction that possesses washings, 34 washing pump, and in the dishwasher of the brshless DC motor that is provided with, make that the phase waveform that inserts voltage V in the revolutions per minute of brshless DC motor 100 relatively is consistent with the phase waveform of relative input current i, thereby reduced the noise of above-mentioned brshless DC motor.

At this moment, provide the operation of input current, realize by restriction according to the lead angle of two phase differences with phase waveform identical with the phase waveform that inserts voltage.

Promptly, above-mentioned brshless DC motor is because insert magnitude of voltage relatively, produce mutual phase difference thereby input current value is later, this moment is by restricting lead angle, make that inserting magnitude of voltage becomes maximum, it is minimum that input current value becomes, thereby the phase waveform of the phase waveform of the feasible voltage of access relatively and relative input current is consistent.

Like this, as shown in Figure 5, drive motors when the phase waveform of phase waveform that inserts voltage relatively and relative input current is consistent can prevent the generation of overload phenomenon, and then reduce noise, also can reduce the consumption of electric power simultaneously.

At this moment, the starting point that makes the brushless DC motor noise attenuating that dishwashing detergent possessed should detect after the goods assembling is finished in the whether qualified process of goods and realize.

That is,, in the process of test brshless DC motor performance, realize with computer or the controller that is arranged in the body by test according to the capacity setting brshless DC motor of dishwasher and after assembling on the assembly line is finished.

Below, in possessing the dishwasher of brshless DC motor, the flow process of brushless DC motor noise reducing method of the present invention with reference to accompanying drawing 3 is described in more detail.

At first, the revolutions per minute of the brshless DC motor that uses in the affirmation dishwasher.S100

Then, when brshless DC motor drives, the phase place of relative access voltage is confirmed.S200

Meanwhile, the phase place of relative input current is confirmed.S300

Then, inserting the phase place of voltage and the phase difference of relative input current relatively confirms.S400

Next, seek and make that inserting voltage becomes maximum, make the value that input current becomes minimum by adjusting lead angle.S500

Then, provide the minimum value of lead angle, thereby make that the phase waveform of the phase waveform that inserts voltage relatively and relative input current is consistent to brshless DC motor.S600

Obtain the minimum value of lead angle by such process, make when providing maximum to go out rate for above-mentioned brshless DC motor and insert the electric current minimum, as shown in Figure 5, when under the phase waveform that the inserts voltage V relatively situation identical, driving brshless DC motor with the phase waveform of relative input current i, can prevent the generation of overload phenomenon, can prevent to produce noise and also have favourable effect at the concerned power of consumption simultaneously thereby have.

In example of the present invention, in order to reduce the noise of above-mentioned brshless DC motor, in detecting the process of motor performance, pointed out the method for noise-decreasing, but also can reduce the noise of brshless DC motor during for the goods generation quality problem sold by maintenance personal's maintenance activity.

The present invention is not limited to above-mentioned example, by the record in the claims as can be known, can design the distortion version by the personnel with corresponding knowledge in the field under the present invention, but such distortion all belongs in the scope of the present invention.

Claims

1. the brushless DC motor noise reducing method of a dishwasher, have for by being fed to the suction of washings and with it in dishwasher of brshless DC motor that each spray arm that is arranged in the washing chamber is provided with washing pump, it is characterized in that: the phase waveform that inserts the phase waveform of voltage and relative input current in the revolutions per minute of above-mentioned brshless DC motor relatively is consistent.Its method comprises: the revolutions per minute S100 of the brshless DC motor that uses in the affirmation dishwasher; Then when brushless direct-current drives, the phase place that inserts voltage is confirmed S200; Meanwhile the phase place of relative input current is confirmed S300; Then insert the phase place of voltage and the phase difference of relative input current relatively and confirm S400; Make that by adjusting the lead angle searching inserting voltage becomes maximum, the value S500 that input current becomes minimum; Then, provide the minimum value of lead angle, thereby make the relative phase waveform of voltage and the consistent S600 of phase waveform of relative input current of inserting to brshless DC motor.

2. according to the brushless DC motor noise reducing method of the dishwasher described in the claim 1, it is characterized in that: providing with waveform input current that the phase waveform that relatively inserts voltage has an identical phase place is to realize by the restriction to the lead angle of two phase differences.

3. according to the brushless DC motor noise reducing method of the dishwasher described in the claim 2, it is characterized in that: above-mentioned lead angle restriction is after the goods assembling is finished, and realizes with computer or controller by test in the process of detection brshless DC motor.