The speed of the stepper motor varies with the input pulse signal. In theory, just give the stepper driver a pulse signal. Each time a pulse (CP) is applied to the drive, the stepper motor rotates by a step angle (a subdivision step angle when subdivided). However, due to the performance of the stepper motor, the CP signal changes too fast, the stepper motor will not follow the change of the electrical signal, and then the stall and lost step will occur. Therefore, when the stepping motor is to be at a high speed, there must be a speed-up process, and there must be a speed-down process when stopping. Generally, the rate of increase and decrease are the same. The following is an example of speed increase:
The speed-up process consists of a take-off frequency plus a speed-up curve (the speed-down process is reversed). The take-off frequency should not be too large, otherwise it will cause stalling and out-of-step. The speed-up curve is generally an exponential curve or a modified exponential curve. Of course, a straight line or a sinusoidal curve can also be used. Users need to choose the appropriate response frequency and lifting speed curve according to their own load. It is not easy to find an ideal curve. Generally, it is necessary to test the machine several times. The exponential curve is more troublesome in the actual software programming process. Generally, the time constant is calculated in advance in the computer memory, and is directly selected during the work process.
Product advantages:
1. Stylish, portable, practical and convenient home charger
2. 6-port USB emergency charger, which can be used safely for tablet computers and can charge 6 devices at the same time
3. Built-in IC chip and fuse, protection: over current, over voltage, short circuit protection
4. The latest release, new design, beautiful appearance, high efficiency and energy saving, the best alternative to the original charger
5. Chargers for MP3, MP4, GPS, PDA, e-books, mobile phones, digital cameras, tablets, etc.
Features
(1) Overcharge protection
(2) Over discharge protection
(3) Short circuit protection
(4) Voltage stabilization protection.
(5) Automatic identification of mobile phone current protection.
1. Connect up to 6 USB devices at a time, and each device will receive a unique and tailor-made charge. The maximum output power of QC3.0 is 18W, which can optimize the charging of all devices.
2.2QC3.0+4 ports total 6 charging ports, which can charge 6 devices with a total power of 84W at the same time
3. With multiple protection safety systems, the product will automatically adjust the charging current according to the needs of the device being charged. Automatically detect and adjust the charging current to charge your device at the fastest speed.
One machine for multiple uses
The USB charger can charge 6 devices at the same time, and the smart recognition technology will detect and provide the best charging level for each of your devices.
The maximum output current of a single USB port is 2.4A. 2QC3.0 has 6 charging ports, which can charge 6 devices at the same time without causing shunting or reducing power. The USB charger can quickly charge your devices. Smartphones and tablets can receive up to 2.4 amps of current, so you can use the device as you like while charging.
Over-current, over-charge, and short-circuit protection will make charging safe, without any risk of overheating or damaging the device. Passed CE/FCC/ROSH/PSE/CCC certification. Through safety certification to ensure safe use.
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Shenzhen Jinziming Electronic Technology Co.,LTD , https://www.powerchargerusb.com