Motor drive voltage-boost control
First Claim
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1. A drive system for a motor having a rotor and at least one phase winding, the system comprising:
- a drive circuit including at least one switch associated with the winding for varying the current passing through the winding;
a rotor position sensing device arranged to sense the position of the rotor;
a power input for connection to a power supply at a nominal voltage;
a boost circuit in electric communication with the power input, and controllable to boost the nominal voltage to a higher boosted voltage for application to the winding; and
a controller arranged to provide drive signals to control the at least one switch, the controller being operable to define a current demand and a required phase advance angle of the current passing through the at least one winding relative to the magnetic field of the rotor, the controller being further operable to control the potential difference applied to the at least one winding to achieve the demanded current and the required phase advance, and to control the boosted voltage output by the boost circuit, wherein the controller is arranged to define the phase angle so that it will vary with the speed of the motor.
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Abstract
A drive system for a motor having a rotor and a phase winding (a, b, c) comprises; a drive circuit including switch means associated with the winding a, b, c for varying the current passing through the winding; rotor position sensing means arranged to sense the position of the rotor; control means arranged to provide drive signals to control the switch means; a power input for connection to a power supply at a nominal voltage; and boost means in electric communication with the power input and power output, and controllable to boost the nominal voltage to a higher voltage for application to the winding.
40 Citations
27 Claims
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1. A drive system for a motor having a rotor and at least one phase winding, the system comprising:
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a drive circuit including at least one switch associated with the winding for varying the current passing through the winding; a rotor position sensing device arranged to sense the position of the rotor; a power input for connection to a power supply at a nominal voltage; a boost circuit in electric communication with the power input, and controllable to boost the nominal voltage to a higher boosted voltage for application to the winding; and a controller arranged to provide drive signals to control the at least one switch, the controller being operable to define a current demand and a required phase advance angle of the current passing through the at least one winding relative to the magnetic field of the rotor, the controller being further operable to control the potential difference applied to the at least one winding to achieve the demanded current and the required phase advance, and to control the boosted voltage output by the boost circuit, wherein the controller is arranged to define the phase angle so that it will vary with the speed of the motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A drive system for a motor having a rotor and a phase winding, the system comprising:
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a drive circuit including at least one switch associated with the winding for varying the current passing through the winding; a power input for connection to a power supply at a nominal voltage; a boost circuit in electric communication with the power input, the boost circuit controllable to boost the nominal voltage to a higher boosted voltage for application to the winding, wherein the at least one parameter includes the level of boost provided by the boost circuit; and a controller arranged to provide drive signals to control the at least one switch, the controller being operable to determine a maximum current limit for the power supply and the magnitude of the current from the power supply and, the controller also being operable to control at least one control parameter of the motor thereby to limit the magnitude of the current from the power supply to the maximum current limit determined by the controller.
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16. A drive system for a motor having a rotor and a phase winding, the system comprising:
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a drive circuit including at least one switch associated with the winding for varying the current passing through the winding; a power input for connection to a power supply at a nominal voltage; and a controller arranged to provide drive signals to control the at least one switch, the controller being operable to determine a maximum current limit for the power supply and the magnitude of the current from the power supply, the controller also being operable to control at least one control parameter of the motor thereby to limit the magnitude of the current from the power supply to the maximum current limit determined by the controller with the at least one parameter including phase advance with the phase advance being the angle that motor phase current is advanced relative to a back emf produced by the motor.
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17. A drive system for a motor having a rotor and a phase winding, the system comprising:
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a drive circuit including at least one switch associated with the winding for varying the current passing through the winding; a power input for connection to a power supply at a nominal voltage; and a controller arranged to provide drive signals to control the at least one switch, the controller being operable to determine a maximum current limit for the power supply and the magnitude of the current from the power supply and, the controller also being operable to control at least one control parameter of the motor that includes at least one of a q-axis current limit and an over-modulation level thereby to limit the magnitude of the current from the power supply to the maximum current limit determined by the controller.
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18. A drive system for a motor having a rotor and a plurality of phase winding, the system comprising:
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an input arranged to receive a battery current from a battery; a switching device associated with the winding for varying the current passing through each of the windings; a dc link arranged to provide an input current to the switching device; a current sensor arranged to produce a sensor output which is a measure of the current in the dc link; a low pass filter arranged to average the output from the current sensor to produce an averaged output, and a controller arranged to receive the current sensor output and the averaged output from the low pass filter to determine the battery current from the averaged output of the current sensor and to calculate the current passing through each of the windings from the sensor output. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A drive system for a motor having a rotor and a phase winding, the system comprising:
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a drive circuit including at least one switch associated with the winding for varying the current passing through the winding; a rotor position sensing device arranged to sense the position of the rotor; a power input for connection to a power supply at a nominal voltage; and a boost circuit in electric communication with the power input, the boost circuit controllable to boost the nominal voltage to a higher boosted voltage for application to the winding, the boost circuit including; a push-pull voltage boost circuit that includes a bifilar wound component having two windings on a common magnetic core, each winding having one end connected to a common first potential; two active switches arranged to be switched on alternately to connect a respective one of the windings to a second potential thereby to produce a boosted voltage across the pair of windings; and two further switches arranged to be switched on alternately to connect a respective one of the windings to an output thereby to apply the boosted voltage to the output; and a controller arranged to provide drive signals to control the at least one switch;
the controller also arranged to define a current demand and a required phase advance of the current passing through the winding relative to the magnetic field of the rotor and to control the potential difference applied to the winding to achieve the demanded current and the required phase advance while also controlling the boosted voltage output with the boost circuit. - View Dependent Claims (25, 26, 27)
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Specification