Water supply
First Claim
1. A water supply apparatus comprising:
- an inverter for converting power output from a solar cell;
a DC brushless motor for receiving converted power from said inverter so as to drive a pump such that water is pumped, said DC brushless motor having no sensor for detecting a position of a rotatable shaft;
means for measuring an operating parameter so as to provide a measured operating parameter; and
means for automatically setting the measured operating parameter.
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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, includes 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, a rotational frequency detecting device for detecting a rotational frequency of the pump, a standard current value acquiring device for acquiring a standard current value corresponding to the rotational frequency detected by the rotational frequency detecting device with reference to the standard current value table, a current detecting device for detecting a current value supplied to the pump, and a comparing device for comparing the current value detected by the current detecting device with the standard current value acquired by the standard current value acquiring device.
53 Citations
20 Claims
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1. A water supply apparatus comprising:
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an inverter for converting power output from a solar cell;
a DC brushless motor for receiving converted power from said inverter so as to drive a pump such that water is pumped, said DC brushless motor having no sensor for detecting a position of a rotatable shaft;
means for measuring an operating parameter so as to provide a measured operating parameter; and
means for automatically setting the measured operating parameter. - View Dependent Claims (2, 3, 4)
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5. A water supply apparatus 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 and supplying the alternating-current output to a DC brushless motor having no sensor for detecting a position of a rotatable shaft;
a pump to be driven by said DC brushless motor;
a water storage tank for temporarily storing water that is to be pumped by said pump; and
a controller, having a start condition and a stop condition for said pump, for automatically causing said pump to be driven based on the start condition and the stop condition. - View Dependent Claims (6, 7, 8)
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9. A water supply apparatus comprising:
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standard current value acquiring means for acquiring a standard current value as a criterion for a shutoff operation of a pump;
current detecting means for detecting value of a current supplied to the pump;
means for comparing the value of the current supplied to the pump with the standard current value as acquired by said standard current value acquiring means so as to determine whether the pump is in the shutoff operation; and
means for stopping the pump after a first certain period of time when it is determined that the pump is in the shutoff operation. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification