METHOD AND SYSTEM FOR DYNAMIC MOTOR BRAKING
First Claim
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1. A method for dynamic motor braking comprising:
- dissipating reverse energy in a motor within motor windings during a non-current supplying period of a commutation sequence by intermittently shorting the motor windings, wherein the motor windings are shorted by simultaneously turning on all switches that are connected to a voltage source or to ground in a three-phase bridge motor control.
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Abstract
A method of dynamic motor braking is disclosed herein. The method comprises: dissipating reverse energy in a motor within motor windings during a non-current supplying period of a commutation sequence by intermittently shorting the motor windings. The motor windings are shorted by simultaneously turning on all switches that are connected to a voltage source or to ground in a three-phase bridge motor control.
12 Citations
25 Claims
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1. A method for dynamic motor braking comprising:
dissipating reverse energy in a motor within motor windings during a non-current supplying period of a commutation sequence by intermittently shorting the motor windings, wherein the motor windings are shorted by simultaneously turning on all switches that are connected to a voltage source or to ground in a three-phase bridge motor control. - View Dependent Claims (2, 3, 4, 5)
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6. A motor braking method comprising:
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providing a pulse width modulated (PWM) signal for controlling a motor; triggering a three-phase bridge motor control using the PWM signal, wherein the three-phase bridge motor control is configured to have three legs connected in parallel, each leg having an upper switch and lower switch connected in series, and wherein the upper switches and lower switches in all the legs together constitute a first row and a second row, respectively; and turning on all switches in a row simultaneously, the row being selected based on detecting at least two active switches in each row. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method of braking a brushless direct current motor comprising:
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providing a three-phase bridge motor control having three legs connected in parallel, each leg having an upper switch connected to a voltage source and a lower switch connected to ground in series, wherein the upper and lower switches of the legs are configured to be a first row and a second row, respectively; identifying reverse energy generated in the motor; selecting at least one row having at least two active switches in a row during a non-current conducting period; activating the inactive switch in the selected row; and dissipating the reverse energy through motor windings. - View Dependent Claims (15, 16, 17)
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18. A motor braking system comprising:
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a pulse width generator generating PWM signals in a predefined commutation sequence; a plurality of switches connected as a three-phase bridge motor control; and a processor configured to generate a switch control signal with reference to reverse energy generated, the switch control signal being configured to trigger the switches such that motor windings are shorted intermittently. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A patient table comprising:
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a patient carrying component movable in multiple directions; a brushless DC motor for controlling movement of the patient carrying component; a three-phase bridge motor control having three legs connected in parallel, each leg having an upper switch connected to a voltage source and a lower switch connected to ground in series, the upper and lower switches of the legs configured to be a first row and a second row, respectively; and a controller configured to turn on all the switches in a row based on the reverse energy detected, the row being detected based on identifying at least two active switches a row. - View Dependent Claims (25)
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Specification