Single chip microcomputer STM32L151CCU6

Photocoupler

1. The encoder for the drag motor can accurately detect the angular displacement of the motor shaft;
2. The encoder is applied to the drag motor to accurately detect the angular displacement of the motor shaft, but the angular displacement of the motor shaft cannot be accurately controlled.
3. Since the angular displacement of the motor shaft is related to the position of the workpiece, but it is not an exact correspondence, accurate position detection and precise control of the workpiece cannot be solved by the encoder!
4. It is a big mistake to attempt to use the drag motor to put on the encoder to achieve precise control of the workpiece and machining position!
"1. The encoder for the drag motor can accurately detect the angular displacement of the motor shaft;"
1. For example, if you turn the motor shaft by hand, the encoder will tell you how many pulses the shaft turns, or tell you how many angles have been turned;
2, this test is accurate, no doubt!
3. However, this accurate detection must be within the allowable range of the encoder feedback pulse frequency. If the frequency range is exceeded, the pulse number will be distorted! Or it is not accurate!
"2. The encoder for the drag motor can accurately detect the angular displacement of the motor shaft, but it cannot accurately control the angular displacement of the motor shaft;"
1. For example, if you turn the motor shaft by hand, the encoder will tell you that the shaft has rotated the angular displacement of 54 pulses, you have to believe this test result;
2, however, you have to look at the number of feedback pulses of the encoder, turn the motor shaft by hand, you want the motor to turn 51 pulses, the motor will turn 51 pulses, you want the motor to turn 52 pulses, the motor will turn 52 Pulse, you want the motor to turn 53 pulses, the motor will turn 53 pulses..., you can't control this precision!
3, not only you can't do it, no one can do it, the Chinese can't do it, foreigners can't do it!
"3. Since the angular displacement of the motor shaft is related to the position of the workpiece, but it is not an exact correspondence, accurate position detection and precise control of the workpiece cannot be solved by the encoder!"
1. For example, when the motor shaft is in the “zero” position, the workpiece is at position A. When the motor rotates and returns to the “zero” position, the workpiece does not return to point A accurately;
2. For example, when the motor shaft is in the “zero” position, the workpiece is at the position A. When the motor rotates and then returns to the “zero” position, the workpiece does not return to point A accurately; in different processes, the workpiece is returned. When the position is "zero", the actual position of the workpiece returning to point A is different;
3. The motor shaft is mounted with an encoder. It only detects whether the motor shaft returns to “zero position”. It cannot control or determine that the workpiece must return to point A!
"4. It is a big mistake to attempt to use the drag motor to put on the encoder to achieve precise control of the workpiece and machining position!"
1. Many people think that with an encoder, with a 17-bit encoder, precise control can be achieved, which is impossible.
2. Regardless of whether you use incremental or absolute encoders, the results are the same, because "attempting to use the drag motor to mount the encoder to achieve precise control of the workpiece and machining position" is a big mistake!
3, "Encoder" is just a "props control" of "accurate control"!
4. Mechanical positioning control is the most accurate position control mode. It is impossible to achieve precise positioning in the true sense by controlling the start, acceleration, uniform speed, deceleration and parking brake of the motor with the comparison command pulse number and the number of feedback pulses. control!

1. If the Chinese do not seriously think about the role and drawbacks of the encoder, nothing will happen!
2, the Chinese must understand that the encoder is only detecting, there is no control of the movement of the motor;
3, position control, mechanical positioning and clamping of the workpiece, it is much more accurate, more practical and more convenient than using the encoder to detect the displacement of the motor shaft;
4, the embroidery process will tell you that the step control method is the true "servo motion control";
5, relying on the encoder's feedback pulse and the number of command pulses given by the user, compare the resulting start, acceleration, uniform speed, deceleration, stop command, to achieve motor motion control, not the true sense of servo control!