Roundss News
- Changchun Rongde Optics
- Co.,Ltd.
- Add：No.1666 Yaan Road,
- North Lake Development District,
- Changchun 130102,China
- Tel：86-0431-81856009
- Fax：86-0431-85256892
- E-mail：rongdecui@roundss.net
- Skype：adacui_roundss
Company News
Current position ：Home > News > Industry News
Rotary encoders working principle and encoder types！
Changchun Rongde Optics Co.,Ltd. Release time：2016-02-22 Browse：1010Rotary encoders
It does this by photoelectric conversion can be converted angular displacement of the output shaft, the angular velocity and other mechanical quantity into corresponding electrical pulses to the digital outputs for measuring speed and with PWM technology can achieve fast speed devices.
It is divided into single output and dual output two kinds. Technical data pulse count (tens to thousands have) per revolution, and power supply voltage.
Single Output refers to the output of the rotary encoder is a pulse, and the rotary encoder output of dual output pulse groups A / B phase difference of 90 degrees, by these two groups can not only measure the speed pulse, can also determine the rotation s way.
The rotary encoder is a light mechanical and electrical technology in one of the velocity displacement sensor
How it works: the center consists of a photoelectric encoder shaft on which a ring through dark engraved lines, optoelectronic transmitting and receiving device to read, get a sine wave signals into four groups A, B, C, D, each a sine wave by 90 degrees out of phase (with respect to a cycle of 360 degrees), the C, D signal inversion, superimposed on the a, B two-phase, can enhance the stabilization signal; the other output per revolution to represent a Z-phase pulse zero reference position.
Encoder code disc material glass, metal, plastic, glass code discs are deposited thin engraved lines on the glass, good thermal stability, high accuracy, metal code disc directly through the barrier and engraved lines, non-friable, However, since the metal has a certain thickness, there are restrictions precision, thermal stability is necessary an order of magnitude worse than glass, plastic code disc is a economical, low cost, but the accuracy, thermal stability, life are to be worse .
In addition to its signal output is diverse, there is a sine wave, square wave, open collector, push-pull forms.
Wherein some common characteristics encoder
Incremental encoder
When the incremental encoder shaft rotates, there is a corresponding phase output. Discrimination and increase or decrease the number of pulses of the rotational direction, to the rear of the circuit requires the use of judgment and counter. The count starting point can be set, and unlimited accumulation and measurement of multi-turn. It can also be issued per revolution a pulse signal Z as a reference mechanical zero position. When the pulse is fixed, while the need to improve resolution, 90 degrees out of phase with the use of A, B of the two signals, the original number of pulses multiplier.
Absolute encoders
When the absolute encoder shaft rotator, has one to one correspondence with the position of the code (binary, BCD code, etc.) output from the code changes the size of the positive and negative directions to determine the location and displacement, without judgment to the circuit. It has an absolute zero-bit code, when a power failure or power-cycle re-measure, you can still read accurately position to power failure or shutdown code, and find exactly zero code. Under normal circumstances an absolute encoder measuring range of 0 to 360 degrees, but special models can also be multi-ring measurements.
Sinusoidal encoder
Sinusoidal encoders are also incremental encoder, the main difference is that the output signal is a sine wave analog signals rather than digital signals. It appears primarily to meet the needs of the electrical field - as a motor feedback detector elements. On the basis of comparison with other systems, people can use this encoder is needed to improve the dynamic characteristics.
The system uses a relatively counting position measurements. Before running through programmatically number of pulses of each signal, such as the exchange rate position, leveling position, the parking brake position and other corresponding, respectively, into the corresponding memory cell, when the lift is run by the rotary encoder detection, real-time software calculates the following signals: where the elevator floor location, for speed position, leveling position, thereby performing floor count, peace issue for speed signal layer signal.
It does this by photoelectric conversion can be converted angular displacement of the output shaft, the angular velocity and other mechanical quantity into corresponding electrical pulses to the digital outputs for measuring speed and with PWM technology can achieve fast speed devices.
It is divided into single output and dual output two kinds. Technical data pulse count (tens to thousands have) per revolution, and power supply voltage.
Single Output refers to the output of the rotary encoder is a pulse, and the rotary encoder output of dual output pulse groups A / B phase difference of 90 degrees, by these two groups can not only measure the speed pulse, can also determine the rotation s way.
The rotary encoder is a light mechanical and electrical technology in one of the velocity displacement sensor
How it works: the center consists of a photoelectric encoder shaft on which a ring through dark engraved lines, optoelectronic transmitting and receiving device to read, get a sine wave signals into four groups A, B, C, D, each a sine wave by 90 degrees out of phase (with respect to a cycle of 360 degrees), the C, D signal inversion, superimposed on the a, B two-phase, can enhance the stabilization signal; the other output per revolution to represent a Z-phase pulse zero reference position.
Encoder code disc material glass, metal, plastic, glass code discs are deposited thin engraved lines on the glass, good thermal stability, high accuracy, metal code disc directly through the barrier and engraved lines, non-friable, However, since the metal has a certain thickness, there are restrictions precision, thermal stability is necessary an order of magnitude worse than glass, plastic code disc is a economical, low cost, but the accuracy, thermal stability, life are to be worse .
In addition to its signal output is diverse, there is a sine wave, square wave, open collector, push-pull forms.
Wherein some common characteristics encoder
Incremental encoder
When the incremental encoder shaft rotates, there is a corresponding phase output. Discrimination and increase or decrease the number of pulses of the rotational direction, to the rear of the circuit requires the use of judgment and counter. The count starting point can be set, and unlimited accumulation and measurement of multi-turn. It can also be issued per revolution a pulse signal Z as a reference mechanical zero position. When the pulse is fixed, while the need to improve resolution, 90 degrees out of phase with the use of A, B of the two signals, the original number of pulses multiplier.
Absolute encoders
When the absolute encoder shaft rotator, has one to one correspondence with the position of the code (binary, BCD code, etc.) output from the code changes the size of the positive and negative directions to determine the location and displacement, without judgment to the circuit. It has an absolute zero-bit code, when a power failure or power-cycle re-measure, you can still read accurately position to power failure or shutdown code, and find exactly zero code. Under normal circumstances an absolute encoder measuring range of 0 to 360 degrees, but special models can also be multi-ring measurements.
Sinusoidal encoder
Sinusoidal encoders are also incremental encoder, the main difference is that the output signal is a sine wave analog signals rather than digital signals. It appears primarily to meet the needs of the electrical field - as a motor feedback detector elements. On the basis of comparison with other systems, people can use this encoder is needed to improve the dynamic characteristics.
The system uses a relatively counting position measurements. Before running through programmatically number of pulses of each signal, such as the exchange rate position, leveling position, the parking brake position and other corresponding, respectively, into the corresponding memory cell, when the lift is run by the rotary encoder detection, real-time software calculates the following signals: where the elevator floor location, for speed position, leveling position, thereby performing floor count, peace issue for speed signal layer signal.
Previous：Incremental Encoder enterprises make innovation in automation industry Next：Roundss encoder application NEMICON encoder equivalent
Products