Fee calculation system for electrical energy consumption of motor drive and method for the same
First Claim
1. A method for calculating fee of electrical energy consumption in a motor drive, comprising the steps of:
- a) calculating an instantaneous load power Pout according to an output voltage, an output current and a power factor of the motor drive;
b) calculating a total instantaneous consumption power P by adding the instantaneous load power Pout with an internal consumption power Pi of the motor drive;
c) multiplying the total instantaneous consumption power P with an operation time of the motor drive and a fee schedule Ec to obtain the fee M of the electrical energy consumption.
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Accused Products
Abstract
A fee calculation system for electrical energy consumption of motor drive and method for the same. The electrical power consumption for the motor drive and for a motor driven by the motor drive are calculated and displayed. An instantaneous load power of the motor is calculated according to an output voltage, an output current and a power factor of the motor drive. The total instantaneous consumption power is the sum of the instantaneous load power of the motor and the internal power of the motor drive. The total instantaneous consumption power is converted to power consumption per hour and is then multiplied with the operation hour to obtain the total electrical energy consumption. The total electrical energy consumption is multiplied with a fee schedule input by user to obtain the total fee for the electrical energy consumption. The total fee is then shown on a display of the motor drive.
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Citations
6 Claims
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1. A method for calculating fee of electrical energy consumption in a motor drive, comprising the steps of:
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a) calculating an instantaneous load power Pout according to an output voltage, an output current and a power factor of the motor drive;
b) calculating a total instantaneous consumption power P by adding the instantaneous load power Pout with an internal consumption power Pi of the motor drive;
c) multiplying the total instantaneous consumption power P with an operation time of the motor drive and a fee schedule Ec to obtain the fee M of the electrical energy consumption. - View Dependent Claims (2, 3, 4, 5)
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6. A system for calculating fee of electrical energy consumption in a motor drive, comprising
an invertor for controlling a motor with a variable speed; -
a controller operatively connected to the invertor and storing a program for calculating a fee of electrical energy consumption in the invertor, the controller calculating the fee of electrical energy consumption in the invertor according to an output voltage, an output current and a power factor of the invertor;
a display operatively connected to the controller and showing the fee calculated by the controller; and
an input unit operatively connected to the controller and used to input an operation time and a fee schedule for calculating the fee of electrical energy consumption.
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Specification