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# Maintopik1

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dc motor control

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### Maintopik1

1. 1. E4102- DC MOTOR CONTROLLED (KAWALAN MOTOR AT) TOPIK 1 – INDUSTRIAL DRIVER LECTURER : FADZILAH BT HASHIM 012-5469607
2. 2. 2.FIELD CONTROL… 1. ARMATURE CONTROL 3. INPUT VOLTAGE CONTROL BASIC INDUSTRIAL CONTROL
3. 3. E4102-DC MOTOR CONTROL FADZILAH HASHIM I a Ra Em VM Did you know there are three types of motor connections a.t the continuation of the series, shunt and compound. 1. Introduction Most of the factories, the machine of choice as a dc drive or control elements. Among the AU engine is unusual compared with high starting torque and has a range of different velocities that can be operated in both directions round. 1.1 DC Motor Speed Control.​​ When the machine at work as a motor, the emf generated (Em) is less than the voltage applied to the terminal voltage (V). Maka Em = V - IaRa V = Em + IaRa When the machines at work as a generator emf is generated (eg) is greater than the voltage applied to the terminal voltage (V). TOPIK 1 - PEMACU INDUSTRI
4. 4. E4102-DC MOTOR CONTROL FADZILAH HASHIM TOPIK 1 - PEMACU INDUSTRI
5. 5. E4102-DC MOTOR CONTROL FADZILAH HASHIM CONCLUSION TOPIK 1 - PEMACU INDUSTRI Shunt motor Motor Series 2) When the machine works as -a generator is emf generated (eg) is greater than the voltage applied to the terminal voltage (V) -a motor, the emf generated (Em) is less than the voltage applied to the terminal voltage (V ). 3) Two special use direct current motors, namely: i. Having a high starting torque ii. Has a range of different velocities 4) From this equation can be expressed. i. When the large V, the speed will increase in size ii. When the armature current (It) high, more high-speed motor iii. Flux (φ) is inversely proportional to motor speed. This means when a high flux, motor speed will be reduced
6. 6. E4102-DC MOTOR CONTROL FADZILAH HASHIM TOPIK 1 - PEMACU INDUSTRI 1.1.2Kawalan Medan Tujuan kawalan ini adalah untuk mengurangkan fluks (φ) dengan menambahkan rintangan medan. Apabila fluks (φ) berkurangan maka kelajuan N boleh bertambah (boleh mencapai 3/4 kali daripada kelajuan biasa). Figure 1.4: Schematic series and shunt motors Excess - A little loss of power at the circuit due to the lack of control of the resulting flux. Weakness - the limited speed range.
7. 7. E4102-DC MOTOR CONTROL FADZILAH HASHIM TOPIK 1 - PEMACU INDUSTRI 1.1.3 Armature control Figure 1.5: Schematic shunt motor and the motor series In both the motor, the resistance R connected in series with the armature. Thus the armature voltage Va can be reduced by making changes in the value of R. If the voltage drop in R high, the voltage Va is reduced. Indirectly, the speed, N can be decreased. Advantages: - a large range of speed control. Weakness - As it flows through the resistance (R) then there is power loss in the resistance.
8. 8. E4102-DC MOTOR CONTROL FADZILAH HASHIM CONCLUSION TOPIK 1 - PEMACU INDUSTRI 3) Advantages-bit loss of power at the control circuit. Weaknesses - the limited speed range. 4) advantages - a large range of speed control. Weaknesses - As it flows through the resistance (R) then there loss of power in the resistance.
9. 9. E4102-DC MOTOR CONTROL FADZILAH HASHIM Sistem Ward-Leonard TOPIK 1 - PEMACU INDUSTRI Figure 1.6: Figure Ward-Leonard System Ward-Leonard system which is typical of a system configuration that contains the generator (Control armature) that is coupled with a DC motor drive. In the current system of field coil motor (M) will be supplied by a separate dc supply. Electronic amplifier will control the current strength of If, the coil field generator. The voltage generated will be the input voltage (V) of the motor armature (m) where the speed is directly proportional to the voltage generated. (nm ∞V). In conclusion, the motor speed can be varied by changing the control signals in electronic amplifiers.
10. 10. E4102-DC MOTOR CONTROL FADZILAH HASHIM Sistem Ward-Leonard TOPIK 1 - PEMACU INDUSTRI Advantages: i. Requiring low power control circuits. ii. Change the speed of a fast and changing the direction of rotation can be done. iii. Can be adjusted in the automation control systems. iv. Providing greater range and precise control. Weaknesses: relatively high cost because it uses two motors and an electronic amplifier.
11. 11. E4102-DC MOTOR CONTROL FADZILAH HASHIM TOPIK 1 - PEMACU INDUSTRI Control resistance (face-plate starter / beginner resistor) Among the methods used to control the motor speed is using the old methods of resistance control. a) Use a variable resistor, also known as a regulator of fields, the series with a shunt coil, can be used only to shunt and compound motors. If the resistance is increased, the flow field, the flux and the emf generated will decline. Therefore more current flows through the armature, and the increased torque that allows the armature accelerates to the emf generated is equal to the applied voltage. With this method, the rate can be increased to three or four times the value of the full excitation, but the rate can not be down in value. Also, for a place setting rate is approximately maintained at a constant value of between zero and full load.
12. 12. E4102-DC MOTOR CONTROL FADZILAH HASHIM TOPIK 1 - PEMACU INDUSTRI Control resistance (face-plate starter / beginner resistor) Among the methods used to control the motor speed is using the old methods of resistance control. b) Consumer resistance, also known as the controller, in series with the armature. Installation of an electrical controller, is equal to the difference is in the starter assembly controller, the resistor is designed to carry continuous armature current while the starter is designed to carry the current for a short period only, it does not become excessively hot. For a certain current value, the greater the resistance of the guard it circuit, the smaller potential difference across the armature, the lower it speed.
13. 13. THANK YOU……THANK YOU…… TOPIK 1 - PEMACU INDUSTRI