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The working principle of incremental rotary encoder！
Changchun Rongde Optics Co.,Ltd. Release time：2016/2/23 Browse：863Incremental encoder (rotary)
1, the working principle:
Optical encoder consists of a center axis of the optical encoder, which has a ring through the dark engraved lines, when the disk rotating at a pitch in the light emitting element is irradiated, the photosensitive member to obtain A, B signal is 90 degrees phase sine wave, this set of signals amplified by the amplifier and shaping, 90 degrees before the square wave output obtained, a compared to B phase conductor, the voltage amplitude is typically 5V. Let A former pilot phase when phase B is positive direction of rotation, the front guide when the A-phase B-phase is the negative direction of rotation, the phase relationship between the A phase and B-phase encoder can determine the forward and reverse, C phase pulse is generated by the reference pulse, also known as zero pulses, which is to generate a pulse rotation axis in a fixed position, the encoder obtained zero reference position. AB-phase pulse signal by frequency - voltage conversion, got the shaft speed is proportional to the voltage signal can be measured velocity value and the amount of displacement.
The magnetic encoder is a new type of electromagnetic sensor developed in recent years, it is with the development of optical encoders developed. The main advantage of the optical encoder is sensitive to moisture and contamination gas, but poor reliability, and magnetic encoder less susceptible to dust and condensation impact, while its simple and compact structure, high-speed operation, fast response (up to 500 ~ 700kHz), volume ratio of the optical encoder is small, lower cost, and easy multiple permutations and combinations of elements precisely, the new functional devices and multifunction devices easier to use an optical semiconductor element and magnetic components than composition. At high speed, high precision, small size, long life requirements, in the fierce market competition, the magnetic encoder for its outstanding characteristics and unique advantages, has become one of the key development of high-tech products.
Magnetic encoder principle is formed by a magnetic pulse train, generating a signal, characterized in that the rare earth magnetic powder unvulcanized rubber in a rubber mix forming the magnetic Pizi vulcanization adhered to the reinforcement ring (1), a magnetic rubber ring (2 ), on which the magnetic rubber ring to circumferentially alternately magnetized to produce S and N poles. At the same time using the new SMR (magnetic resistance) or Hall effect sensor as the sensing element, the signal is stable and reliable. Moreover, using double wiring process, but also the magnetic encoder only has the general incremental encoder signals and only incremental signal and index signal output, also has absolute signal output. So, despite the current about 90% of the encoders are optical encoders, but there is no doubt that in the future motion control systems, magnetic encoder will gradually increase the amount.
1, the working principle:
Optical encoder consists of a center axis of the optical encoder, which has a ring through the dark engraved lines, when the disk rotating at a pitch in the light emitting element is irradiated, the photosensitive member to obtain A, B signal is 90 degrees phase sine wave, this set of signals amplified by the amplifier and shaping, 90 degrees before the square wave output obtained, a compared to B phase conductor, the voltage amplitude is typically 5V. Let A former pilot phase when phase B is positive direction of rotation, the front guide when the A-phase B-phase is the negative direction of rotation, the phase relationship between the A phase and B-phase encoder can determine the forward and reverse, C phase pulse is generated by the reference pulse, also known as zero pulses, which is to generate a pulse rotation axis in a fixed position, the encoder obtained zero reference position. AB-phase pulse signal by frequency - voltage conversion, got the shaft speed is proportional to the voltage signal can be measured velocity value and the amount of displacement.
The magnetic encoder is a new type of electromagnetic sensor developed in recent years, it is with the development of optical encoders developed. The main advantage of the optical encoder is sensitive to moisture and contamination gas, but poor reliability, and magnetic encoder less susceptible to dust and condensation impact, while its simple and compact structure, high-speed operation, fast response (up to 500 ~ 700kHz), volume ratio of the optical encoder is small, lower cost, and easy multiple permutations and combinations of elements precisely, the new functional devices and multifunction devices easier to use an optical semiconductor element and magnetic components than composition. At high speed, high precision, small size, long life requirements, in the fierce market competition, the magnetic encoder for its outstanding characteristics and unique advantages, has become one of the key development of high-tech products.
Magnetic encoder principle is formed by a magnetic pulse train, generating a signal, characterized in that the rare earth magnetic powder unvulcanized rubber in a rubber mix forming the magnetic Pizi vulcanization adhered to the reinforcement ring (1), a magnetic rubber ring (2 ), on which the magnetic rubber ring to circumferentially alternately magnetized to produce S and N poles. At the same time using the new SMR (magnetic resistance) or Hall effect sensor as the sensing element, the signal is stable and reliable. Moreover, using double wiring process, but also the magnetic encoder only has the general incremental encoder signals and only incremental signal and index signal output, also has absolute signal output. So, despite the current about 90% of the encoders are optical encoders, but there is no doubt that in the future motion control systems, magnetic encoder will gradually increase the amount.
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