Source impedance measurement for motor control
First Claim
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1. A power inverter assembly for an electric motor, comprising:
- a diode bridge, coupled to power lines from a power source and adapted to convert alternating current carried on said power lines to direct current carried on a positive bus line and a negative bus line;
a bus capacitor coupled between said positive and negative bus lines; and
a resistor of known resistance value, selectively coupled between said positive and negative bus lines, such that when said resistor is coupled between said positive and negative bus lines, the magnitude Δ
V of a resultant voltage drop between said positive and negative bus lines can be observed and correlated with impedance of said power source.
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Abstract
A power inverter assembly for a three-phase motor includes a resistor of known resistance which is capable of being switched in between the positive and negative DC bus lines that supply power to the power control electronics. When the resistor is switched in, a voltage drop across the bus lines is observed. The magnitude of this voltage drop is then used to determine a percent impedance value which indicates whether the source impedance is sufficient.
14 Citations
32 Claims
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1. A power inverter assembly for an electric motor, comprising:
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a diode bridge, coupled to power lines from a power source and adapted to convert alternating current carried on said power lines to direct current carried on a positive bus line and a negative bus line; a bus capacitor coupled between said positive and negative bus lines; and a resistor of known resistance value, selectively coupled between said positive and negative bus lines, such that when said resistor is coupled between said positive and negative bus lines, the magnitude Δ
V of a resultant voltage drop between said positive and negative bus lines can be observed and correlated with impedance of said power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of assessing the impedance of a power source coupled to a power inverter assembly having a diode bridge, coupled to power lines from said power source and adapted to convert alternating current carried on said power lines to direct current carded on a positive bus line and a negative bus line, said method comprising the steps of:
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(a) coupling a resistor of known resistance value between said positive and negative bus lines; (b) measuring the magnitude of a voltage drop between said positive and negative bus lines resulting from said step (a) of coupling; and (c) correlating said voltage drop with said impedance. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A motor system, comprising:
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a power source; a power inverter assembly including a diode bridge coupled to power lines from said power source and adapted to convert AC voltage carried on said power lines to DC voltage carried on a positive bus line with respect to a negative bus line; a bus capacitor coupled between said positive and negative bus lines; and a resistor of known resistance value, selectively coupled between said positive and negative bus lines, such that when said resistor is coupled between said positive and negative bus lines, the magnitude Δ
V of a resultant voltage drop between said positive and negative bus lines can be observed and correlated with impedance of said power source. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification