MagnTek · New Product | MT6835, the fourth generation upgraded magnetic angle encoder chip suitable for general servo control
MT6835 chip is MagnTek's latest fourth generation magnetic Angle encoder IC, that is, the MT6825 new upgrade chip, based on Anisotropic Magnetoresistive (Anisotropic Magnetoresistive, anisotropic magnetoresistive, AMR technology and proprietary signal processing enable absolute Angle measurement from 0° to 360°.
The chip consists of a pair of AMR Wheatstone Bridges and a signal processing ASIC circuit. With the rotation of the magnetic field parallel to the surface of the chip, the chip can output ABZ/UVW, PWM and other Angle signals, while the user can also read the 21bit absolute Angle data inside the chip through the SPI interface supporting up to 16MHz clock. Supports a maximum speed of 120,000 RPM. The MT6835 chip can be used in various applications requiring high-speed and high-precision control, such as closed-loop stepper motor control, 2,500-16,384 line servo applications, and 17-bit absolute value servo motor applications.
| 核心提升
INL
The MT6835 provides a client self-calibration mode. In this mode, the system only needs to be operated at a constant speed without any data interaction, and the MT6835 chip will automatically calculate and calibrate various nonlinearity caused by the magnet, installation position deviation and the chip itself, and automatically store in the EEPROM of the chip. After constant velocity self-calibration, the INL can be reduced to within ±0.07° (typical value). In addition, the MT6835 provides a further NLC towing calibration mode, which can reduce the INL to within ±0.02° (typical value).
| 闭环速度波动
We compare the speed fluctuations of the optical braiding and the MT6835 (after self-calibration) in their closed loop operation on the same 23-bit general purpose servo system with optical braiding.
* The speed fluctuation data here comes from the upper computer software that comes with the servo system
Ø The running effect of 23 bit optical encoder（3000RPM）
Note: The data is tested using a commercial servo system (coded as 23-bit optical encoder)
Ø MT6835 operation effect（3000RPM）
Note: The data is tested using the same commercial servo system (replace the 23-bit optical encoding with MT6835)
| Temperature compensation
Figure 1：At 70 ℃, the speed fluctuation of MT6835GT (without temperature compensation) during closed-loop operation at 3000RPM is about ± 20.77 (rpm)
Figure 2: Speed fluctuation of approximately ± 10.26 (rpm) during closed-loop operation of MT6835GT (after temperature compensation) at 3000RPM at 70 ℃
MT6835 has built-in temperature compensation, which can effectively suppress the deterioration of angle accuracy caused by temperature changes and the resulting increase in system speed fluctuations.
| Dynamic response
We compare the dynamic responses of the optical braiding and the MT6835 (after self-calibration) in closed loop operation on the same general purpose servo system with 23-bit optical braiding
* The speed data here comes from the upper computer software that comes with the servo system
Closed loop 0~3000RPM rapid acceleration step response: 23 bit optical encoder (left image) vs MT6835 (right image)
How to Run MT6835 Automatic Calibration Explanation Video
MagnTek is committed to continuous breakthroughs and innovations in magnetic semiconductor sensing technology. Since the release of the first generation magnetic angle encoder IC, it has gone through 5 years of market experience. The release of the fourth generation magnetic angle encoder IC-MT6835 will be a new starting point for the development of Magnum's magnetic angle encoder IC in the next 5 years. With the spirit of "sharpening a sword in ten years", we will overcome difficulties and forge ahead on the path of key core technologies, riding the wind and waves!
