Electric vacuum cleaner
a vacuum cleaner and electric technology, applied in the direction of positive displacement liquid engines, pumps, machines/engines, etc., can solve the problems of deteriorating controller development efficiency and reducing the suction power of the blower in the cleaner
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first embodiment
[0032] Firstly, structure of a canister type electric vacuum cleaner 20 (hereinafter referred to as a “cleaner 20”) will now be described with reference to FIG. 1.
[0033] As shown in FIG. 1, a main body 21 of cleaner 20 includes a lower case 22 whose upper surface is open, an upper case 23, a bumper 24 and a lid 25. The rear top part of lower case 22 is closed by upper case 23. Bumper 24 is sandwiched between circumferential edges of lower case 22 and upper case 23 and is joined therewith. Lid 25 is swingably provided to the front part of lower case 22 to open and close the front part. Formed on the lid 25 is an informing section 40, including a light emitting element or a sounding element, e.g., a light Emitting Diode (LED) or speaker, to inform an operator of an operational state of the cleaner 20, e.g., an amount of collected dust, during its operation.
[0034] A bag-shaped filter 27 (hereinafter referred to as “filter 27”) and a blower 26 in a rear side of filter 27 are serially ...
second embodiment
[0089] In the first embodiment, the control section 10a controls blower 26 by using the detected current In as it is. In the second embodiment, the control section 10b controls blower 26 by using a calculated current value Ix which results from calculation in a method that is predetermined taking a relationship between the detected current In and the applied power into account every time when the detected current In is acquired. The calculation does not need a complicated process, and thus not adversely affect the processing capacity of a microprocessor.
[0090] With reference to FIG. 8, respective functions of control section 10b controlling blower 26 based on the calculated current value Ix (hereinafter referred to as “calculated current Ix”) are described. Control section 10b is formed such that a current calculating section 72 is added to control section 10a shown in FIG. 4.
[0091] Current acquiring section 71 acquires the detected current In, which is periodically detected by cu...
third embodiment
[0097] With reference to FIGS. 9 to 11, controller 110 of cleaner 20 in the third embodiment is now described. A DC power source 61, e.g., secondary battery, powers controller 110 to rotate motor 5 as shown in FIG. 9. Motor 5 is connected in series with the applied power to the motor 5.
[0098] As shown in FIG. 11, control section 10c includes output timing determination section 64 provided with a PWM signal generating section 65 generating a pulse width modulation signal. The PWM signal can be generated by publicly known method. When power voltage from DC power source 61 is applied to controller 110 and the PWM signal formed with a period having Pc second, as indicated in FIG. 10(b), is supplied to a gate of MOSFET, motor 5 is periodically switched on for tc second to rotate. Duty factor Du of the PWM signal is calculated as follows:
Du=tc / Pc (3)
As can be understood from the formula, larger the duty factor Du larger the applied power to blower 26.
[0099] As described above, contro...
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