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KA3011 Arkusz danych(PDF) 11 Page - Fairchild Semiconductor |
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KA3011 Arkusz danych(HTML) 11 Page - Fairchild Semiconductor |
11 / 16 page KA3011BD 11 6. REVERSE ROTATION PREVENTION • When the output of the OR Gate, A is LOW, it steers all the output current of the current sense Amp to the Gain Controller zero. The output current of the Driver becomes zero and the motor stops. • As in the state of the forward rotation, the D-F/F output, Q is HIGH and the motor rotates normally. At this state, if the control input is changed such that EC>ECR, then the motor rotates slowly by the reverse commutation in the Driver. When the motor rotates in reverse direction, the D-F/F output becomes Low and the OR Gate output, becomes LOW. This prevents the motor from rotating in reverse direction. The operation principle is shown in the table and the flow chart. Rotation H2 H3 D-F/F (Q) Reverse rotation preventer EC<ECR EC>ECR Forward H H →LH Forward - Reverse L H →L L - Brake and stop + − + − + − Current Sense Amp Gain Controller Driver D-F/F M D Q CK H3+ H3 − H2+ H2 − EC ECR A Low Active Forward rotation at EC < ECR Rotating speed is decreased due to reverse torque at EC >ECR. (Motor still rotates forward) At the moment that the motor rotates in reverse, the reverse rotation preventer makes the output power transistor open. Rotating reverse at short time due to motor inertia Stop within 1/6 turn reverse rotating |
Podobny numer części - KA3011 |
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Podobny opis - KA3011 |
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