Encoder optički za Micro Metal motore, jedan par
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Pololu is an electronics manufacturer and online retailer serving education, maker, and professional engineering industries with products ranging from sensors and motion control electronics to motors and wheels to complete robots. We strive to offer well-engineered, quality products that enable our customers to take their own projects from idea to reality. Here is why you can rely on Pololu: Good people It takes good people to make good things. Pololu has a world-class team with shared values, which allows us to seek the right way to do things together as well as to help each other improve. That leads directly to better products and a better customer experience. Pololu electronics manufacturing area with multiple pick and place lines. We make our products We manufacture most of the products we sell. Because we control everything from initial design through manufacturing, testing, and packaging, we can offer unique products quickly and economically. We are constantly improving our processes to bring you better parts at lower prices. Thermal image of the top side of the dual VNH5019 motor driver shield during one of our current tests. Quality engineering The engineering of our products differentiates Pololu from the competition. We take a rigorous approach to the details of every product, from design, to validation, to evaluating feedback from customers. Commitment to support At Pololu, we are committed to standing behind our products with a full spectrum of support, from complete documentation (including high-quality pictures, connection diagrams, schematics, datasheets, and example code), to maintaining stock levels so that you can buy the parts you need, to providing same-day shipping service so that you can get your parts as quickly as possible. If you have trouble with a product, you can call, email, or post on our forum and receive help from real engineers. Company background Pololu was founded in 2000 by three students at the Massachusetts Institute of Technology. Our first product was the unique IR beacon system developed for the 6.270 Autonomous Robot Design Competition. The beacons allowed pairs of robots to detect each other, allowing MIT students to give their robots more sophisticated strategies. In 2001, Pololu was incorporated while still operating out of an MIT dorm. Upon graduation of the last founder in 2002, we moved from Massachusetts to Las Vegas, NV for its better climate and lower taxes. Our office has since become the meeting place for the Las Vegas robotics club, which was formed in 2004.
Add quadrature encoders to your micro metal gearmotors (extended back shaft version required) with this kit.
The installed system does not exceed the 12 mm × 10 mm cross section of the motors and extends only 5 mm beyond the plastic motor end cap.
The 3-tooth wheel provides 12 counts per revolution;
Using the 5-tooth wheel yields 20 counts per revolution.
To compute the encoder counts per revolution of the gearbox output, multiply by the gear ratio
This version is intended for use at 3.3 V.
Because the encoder board outputs are direct phototransistor outputs, some signal conditioning is often necessary
between the sensor and a digital system processing the signals.
The encoder board is designed to be soldered directly to the back of the motor, with the back shaft of the motor protruding
through the hole in the middle of the circuit board.
The better aligned the board, the better the output signal quality will be. One way to achieve good alignment is to tack down
the board to one motor pin and to solder the other pin only when the board is well aligned.
Be careful to avoid prolonged heating of the motor pins, which could deform the plastic end cap of the motor or the motor brushes.
Once the board is soldered down to the two terminals, the motor leads are connected to the M1 and M2
pads along the edge of the board, along with the power for the sensors and the two quadrature outputs
The edge connections are on a 2 mm pitch.
The board can be soldered perpendicularly to another PCB, to a 2 mm connector, or to individual wires
Once the board is soldered to the motor, the plastic encoder wheel can be pushed onto the motor shaft.
The encoder wheel should be pushed on far enough that the gap between the wheel and sensors is approximately 0.5 mm.
One way to get consistent gaps is to use a few sheets of paper or a business card as a shim when installing the encoder wheel.
The best way to confirm optimal placement of the encoder wheel is to look at the signal with an oscilloscope.
The oscilloscope capture shows what the signal outputs look like with the wheel mounted at an optimal distance from the sensors.
Note that even in this optimal case, the signals from the two channels are different due to inherent variations in the two reflectance sensors,
but both signals are 90° out of phase and both span a large voltage range.
two sensor boards
two 3-tooth encoder wheels
two 5-tooth encoder wheels