The invention discloses a digital converter for a rotary transformer. The position q and the speed omega of the rotor of a drive motor in an electric vehicle are acquired by performing digital conversion on output signals of the rotary transformer in an electric drive system of the electric vehicle. The digital converter for the rotary transformer is characterized by comprising a digital sine and cosine generator, an excitation voltage generation module, a rotary transformer output signal demodulation module and a position and speed acquisition module. According to the digital converter for the rotary transformer, by the introduction of a sine and cosine wave generator based on a motor controller processor chip and the demodulation of the output signals of the rotary transformer, a time delay phenomenon is eliminated, the cost of the electric drive system of the electric vehicle is reduced, and the acquisition precision of the position and the rotating speed of the electric drive system of the electric vehicle is improved.

Digital converter for rotary transformer

The invention discloses a rotating transformer digital converter capable of on-line failure detection and fault-tolerant control. According to the method, an electric automobile PMSM is used for controlling matched utilization of a microprocessor DSP and the rotating transformer so as to achieve a PMSM rotor position of a drive system of the PMSM. Failures of the rotor position of the drive system of the PMSM can be detected real-timely. Meanwhile, a kalman filter is adopted for identifying errors of the rotor position, and realizing self-adaptive fault-tolerant control, and therefore precision of acquiring the rotor position is improved.

Rotating transformer digital converter capable of on-line failure detection and fault-tolerant control

Devices and methods related to high-resolution multi-turn sensors In some embodiments, a position sensing device can include a shaft having a longitudinal axis, and a first sensor having a magnet and a magnetic sensor The magnet can be coupled to the shaft, and the magnetic sensor can be positioned relative to the magnet such that the first sensor allows measurement of an angular position of the magnet relative to the magnetic sensor to thereby allow determination of the corresponding angular position of the shaft within a given turn of the shaft The position sensing device can further include a second sensor coupled to the shaft and configured to allow measurement of a turn-number of the shaft The second sensor can include one or more of different types sensing functionalities to yield an output representative of the turn-number of the shaft

Devices and methods related to high-resolution multi-turn sensors

The invention discloses a double-rotary-transformer signal processing system utilizing digital signal processing (DSP) chips as rotary transformer decoding chips The integral double-joint double-rotary-transformer signal processing system based on the DSP mainly consists of two non-contact rotary transformer transmitters, a conditioning circuit and a double-DSP-chip controller The decoding DSP chips serve as core chips of the double-rotary-transformer signal processing system, the double-DSP-chip controller is used for receiving an electric motor angular position and a joint angular position obtained by the decoding DSP chips and controlling a permanent magnet synchronous motor, and two DSP chips are communicated through an input-output (IO) port and a serial peripheral interface (SPI)

Double-rotary-transformer signal processing system

The invention discloses a signal processing device compatible with multiple kinds of interfaces of encoders and rotary transformers. The signal processing device at least comprises an input interface module, a signal conditioning circuit, an FPGA (Field Programmable Gate Array) circuit module and a signal output interface module, wherein the input interface module, the signal conditioning circuit, the FPGA circuit module and the signal output interface module are sequentially connected. The signal processing device can be compatible with all kinds of traditional incremental encoders, absolute type encoders and rotary transformers in the market. The invention can realize that signals of more than one encoder and rotary transformer can be simultaneously processed and one or more signal processing results are output without replacing the signal processing device of a detection element interface, is suitable for detection and processing of position, speed and angle signals of different types of mechanical movement parts, is convenient for filed debugging of technicians, is convenient for use, is good in practicability, and has better actual application value and market competitiveness.

Signal processing device compatible with multiple kinds of interfaces of encoders and rotary transformers

The invention relates to a multiturn absolute rotary encoder based on a rotary transformer, which is characterized in that: a sensor is displaced by taking the rotary transformer as a shaft angle; a shaft angle decoding circuit can be formed by adopting DSP as a core processor; a sine wave which can be controlled by frequency and phase in the method that the circuit is synthesized by direct digital frequency for the numerical control of an oscillator; and the sine wave is directly taken as an excitation rotary transformer signal via a power amplifier and a filter circuit; the rotary transformer signal is transferred to A/D converter after being run through a matching circuit of electronic transformer; after sampling, digital filtering and digital signal processing, the sine and cosine value for the actual angle of two channels is generated; the angle error change is tracked dynamically by the PI algorithm; the mechanical displacement of the rotating object is converted into digital shaft angle position and speed. The multiturn absolute rotary encoder based on a rotary transformer has the advantages of high tracking speed, high conversion accuracy, high reliability, simple structure, sensitive movement, low environmental condition, strong anti-interference capability, high measuring accuracy and speed voltage output.

Jinbao Ma

Papers

Multiple-loop absolute type rotary encoder based on rotating transformer