In this paper, TMS320F28027 is used to control two stepping motors, so that the object can move in the plane, so that the object can draw the specified curve and circle arbitrarily in the plane. Figure 1 shows the model of the suspension system.
Figure 2 shows the control system block diagram of the suspension system. The TMS320F28027 is used as the control chip, and the L298N is used to drive two stepping motors. The stepping motor adopts 42HS4813A4, its rated current is 1.3A, and the step angle is 1.8°. The real-time coordinates of the controlled object are displayed by LCD-12864 liquid crystal. Control two stepping motors to rotate forward and reverse to achieve the effect of any movement of the object in the plane.
L298N is a high voltage, high current motor drive chip produced by ST. Figure 3 shows the circuit schematic of the L298N module. The main features of the chip are: high working voltage, its maximum working voltage can reach 46V; large output current, instantaneous peak current up to 3A, continuous working current is 2A; high voltage and high current full bridge with two H bridges driver. Two L298Ns are used to control two stepping motors respectively. The rated current of the stepping motor is 1.3A. When the two phases are connected, the current is 2.6A. The L298N can reach the current requirement of the 42HS4813A4 stepping motor.
The accuracy of the absolute encoder must be higher than the accuracy of the stepper motor, so the 10-bit absolute encoder is used here. The model selected is Minil024J with an accuracy of 10 digits. The advantage is that the contactless Hall detection technology is used. The sensor operates without being affected by dust or other debris, which overcomes the shortcomings based on the principle of optical detection.
Glass Metal Sealed Cap
Glass Metal Sealed Cap
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