Water supply
First Claim
1. A water supply apparatus which converts output power of a solar cell with an inverter to drive a motor pump for pumping up water, said water supply apparatus characterized in that a DC brushless motor having no sensor for detecting a position of a rotatable shaft is used as a motor for driving said pump.
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Accused Products
Abstract
According to the present invention, in a water supply apparatus which converts output power of a solar cell with an inverter to drive a motor pump for pumping up water, a DC brushless motor having no sensor for detecting a position of a rotatable shaft is used as a motor for driving the pump. Further, the water supply apparatus having a pump and a frequency converter for supplying electric power to the pump and controlling a rotational speed of the pump comprises a standard current value table in which rotational frequencies of the pump and standard current values as criteria for shutoff operation at the rotational frequencies are associated with each other, rotational frequency detecting means for detecting a rotational frequency of the pump, standard current value acquiring means for acquiring a standard current value corresponding to the rotational frequency detected by the rotational frequency detecting means with reference to the standard current value table, current detecting means for detecting a current value supplied to the pump, and comparing means for comparing the current value detected by the current detecting means with the standard current value acquired by the standard current value acquiring means.
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Citations
10 Claims
- 1. A water supply apparatus which converts output power of a solar cell with an inverter to drive a motor pump for pumping up water, said water supply apparatus characterized in that a DC brushless motor having no sensor for detecting a position of a rotatable shaft is used as a motor for driving said pump.
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4. A water supply apparatus characterized by comprising:
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a solar cell;
an inverter for converting a direct-current output of said solar cell to an alternating-current output;
a pump driven in response to an output of said inverter by a DC brushless motor having no sensor;
a water storage tank for temporarily storing water which is pumped up by said pump; and
a controller for controlling operation of said pump. - View Dependent Claims (5)
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6. A water supply apparatus having a pump and a frequency converter for supplying electric power to said pump and controlling a rotational speed of said pump, said water supply apparatus characterized by comprising:
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a standard current value table in which rotational frequencies of said pump and standard current values as criteria for shutoff operation at said rotational frequencies are associated with each other;
rotational frequency detecting means for detecting a rotational frequency of said pump;
standard current value acquiring means for acquiring a standard current value corresponding to the rotational frequency detected by said rotational frequency detecting means with reference to said standard current value table;
current detecting means for detecting a current value supplied to said pump; and
comparing means for comparing the current value detected by said current detecting means with the standard current value acquired by said standard current value acquiring means. - View Dependent Claims (7, 8, 9, 10)
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Specification