CWESC

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// 2022-06-10

The current version starts smoothly and runs stably. Source code file ''source_cwesc_22-06-10-1.rar''.

Supplement and summary of the features of this open source project are as follows:

1. Two-way brushless ESC.
2. PWM signal input, high pulse width range 1000~2000us, greater than 1500 for forward rotation, less than reverse rotation.
3. Complementary PWM output, synchronous freewheeling, and the lower arm generates almost no heat.
4. 75% of the time is when the PWM high level is used to collect back electromotive force, and the data is more accurate at lower levels.
5. With serial port output, two-way data transmission, interrupt sending and receiving. Easy to debug and takes up very little CPU time.
6. Start-up is divided into two stages, and it can start normally even with large load, large torque or reverse rotation.
7. With over-temperature and over-current protection.
8. With phase loss protection.

Upload several back electromotive force waveform diagrams. The picture is drawn using the serial port software vofa+, and the ESC sends the data to the host computer.

* pwm_in is the pwm input duty cycle, 430 means 43%.

* Red is the virtual median, and the other three lines are UVW three opposite electromotive forces.

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// 2022-06-09

Re-adjust the program structure to solve the following problems:

1. If there is too much code in the interrupt program, interrupt deadlock may occur;

2. That is, the current interrupt has not been executed yet, and the next interrupt occurs again;

3. If a pair of half-bridges continues to conduct, there is a risk of burning out the drive tube and motor.

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// 2022-06-08

1. Correct the PWM frequency to 32k. Reserve enough time for ADC sampling.

2. The ADC sampling time is changed from two to three to increase low-speed accuracy. The lowest speed can be stabilized at 500rpm, 4-pole motor, which is 12kepm.

3. When starting and dragging, the starting torque is significantly increased.

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// first version

cwesc, brushless and inductive ESC.

1. The main control is cw32f030

2. Power supply in 2~4s

3. Enter pwm

4. With serial port debugging

5. Over-temperature and phase loss protection

6. Synchronous continuous flow

Continuing debugging...

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** Video 1 is the first version.

** Video 2 is firmware 220608, with counterweight motor for forward and reverse rotation, high current and high torque.