Motor control apparatus and control method thereof
First Claim
1. A motor control apparatus supplying AC power to a motor having a plurality of motor windings, comprising:
- an inverting part comprising;
a bridge circuit having a plurality of first and second switching units, and supplying the AC power to the motor;
brake relays short circuiting the motor windings by turning on when the motor brakes;
brake resistors, respectively, connected to the plurality of motor windings and consuming an overcurrent generated by the motor when the brake relays short circuit the plurality of motor windings; and
a switching controller directly turning on and turning off one of the first and second switching units provided in respective opposite ends of the inverting part so that the overcurrent consumed by the brake resistors is changeable in proportion to a rotation speed of the motor, when the brake relays short circuit the plurality of motor windings,wherein the overcurrent consumed by the brake resistors is changed in proportion to a duty cycle of the first and second switching units turned on and turned off by the switching controller.
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Accused Products
Abstract
A motor control apparatus supplying AC power to a motor having a plurality of motor windings having an inverting part including a bridge circuit having a plurality of switching units, and supplying the AC power to the motor; brake relays short circuiting the motor windings by turning on when the motor brakes; brake resistors, respectively, connected to the motor windings and consuming an overcurrent generated from the motor when the brake relays short circuit the motor windings; and a switching controller turning on and turning off the switching units provided in one of opposite ends of the inverting part so that the overcurrent consumed by the brake resistors is changeable in proportion to a rotation speed of the motor, when the brake relays short circuit the motor windings to improve an effect of a dynamic braking operation and to prevent breakdown thereof.
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Citations
14 Claims
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1. A motor control apparatus supplying AC power to a motor having a plurality of motor windings, comprising:
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an inverting part comprising; a bridge circuit having a plurality of first and second switching units, and supplying the AC power to the motor; brake relays short circuiting the motor windings by turning on when the motor brakes; brake resistors, respectively, connected to the plurality of motor windings and consuming an overcurrent generated by the motor when the brake relays short circuit the plurality of motor windings; and a switching controller directly turning on and turning off one of the first and second switching units provided in respective opposite ends of the inverting part so that the overcurrent consumed by the brake resistors is changeable in proportion to a rotation speed of the motor, when the brake relays short circuit the plurality of motor windings, wherein the overcurrent consumed by the brake resistors is changed in proportion to a duty cycle of the first and second switching units turned on and turned off by the switching controller. - View Dependent Claims (2, 3)
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4. A control method of a motor control apparatus having an inverting part comprising a bridge circuit including a plurality of first and second switching units, and supplying AC power to a plurality of motor windings of a motor, and brake resistors connected to the plurality of motor windings and consuming an overcurrent generated from the motor when the motor brakes, comprising:
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braking the motor by short circuiting the plurality of motor windings; and directly turning on and turning off one of the first and second switching units provided in respective opposite ends of the inverting part so that the overcurrent consumed by the brake resistors is changeable according to a rotation speed of the motor, wherein the overcurrent consumed by the brake resistors is changed in proportion to a duty cycle of the one of the first and second the switching units turned on and turned off. - View Dependent Claims (5)
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6. A motor control apparatus supplying power to a motor having a plurality of motor windings, comprising:
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a plurality of switching units to supply AC power to the motor; brake resistors, respectively, connected to the plurality of motor windings to exhaust power from an overcurrent generated by the motor; and a controller to directly control selected ones of the plurality of switching units so that the power exhausted by the brake resistors corresponds to a rotation speed of the motor, wherein the overcurrent consumed by the brake resistors is changed in proportion to a duty cycle of the switching units turned on and turned off by the controller. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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Specification