CN203151415U

CN203151415U - Rotary transformer system

Info

Publication number: CN203151415U
Application number: CN2013200016547U
Authority: CN
Inventors: 黄雷; 苟毅彤
Original assignee: QINGYUAN ELECTRIC VEHICLE CO Ltd TIANJIN
Current assignee: QINGYUAN ELECTRIC VEHICLE CO Ltd TIANJIN
Priority date: 2013-01-04
Filing date: 2013-01-04
Publication date: 2013-08-21
Anticipated expiration: 2023-01-04

Abstract

The utility model discloses a rotary transformer system. A digital signal control chip modulates and outputs a sinusoidal excitation signal in preset frequency, and after conditioning, the signal is used as nominal voltage of a rotary transformer. A zero passage time of the sinusoidal excitation signal is used as an interrupt signal of the digital signal control chip. A timer of the digital signal control chip starts to count with the zero passage time as a reference, and after delay of one fourth of a period, the digital signal control chip acquires AD samplings of sine and cosine signals of the rotary transformer. The rotary transformer outputs two paths of sine and cosine modulation analog signals. A signal conditioning circuit performs conditioning on the two paths of sine and cosine modulation analog signals, obtains the analog signals after conditioning and transmits the signals to the digital signal control chip. The digital signal control chip performs synchronous sampling on the conditioned analog signals, obtains AD conversion results and outputs rotor position angle values. The system does not need a special-purpose resolving chip, and improves integration degree of a control system and reduces cost of the control system.

Description

A kind of resolver system

Technical field

The utility model relates to resolver, relates in particular to a kind of resolver system.

Background technology

Resolver is a kind of position transducer based on the electromagnetic coupled principle, and it is a kind of small-sized alternating current machine as angular surveying in essence.Resolver need add excitation signal as input signal, and it is output as the analog signal of two-way quadrature simultaneously, thereby must obtain the digital signal of correspondence position by analog-to-digital conversion and computing, can be input to control chip.

At present, some special digital conversion (RDC) chips for example: the conversion that the AU6802 of the AD2S1200 of AD company or TAMAGAWA company etc. can finish the generation of resolver excitation signal and output signal to digital position signalling.Cause it expensive but these chips are single-minded owing to performance, purposes is special.

The utility model content

The utility model provides a kind of resolver system, and the utility model has reduced production cost, has satisfied the needs in the practical application, sees for details hereinafter to describe:

A kind of resolver system comprises: resolver, Digital Signals chip and signal conditioning circuit;

The sinusoidal excitation signal of described Digital Signals chip modulation output predeterminated frequency, described Digital Signals chip is nursed one's health described sinusoidal excitation signal, and the conditioning back is as the rated voltage of described resolver; The zero passage moment of described sinusoidal excitation signal is as the interrupt signal of described Digital Signals chip; The timer of described Digital Signals chip begins counting as time reference constantly with zero passage, and the described Digital Signals chip of 1/4 all after dates of delaying time is gathered the AD sampling of described resolver cosine and sine signal;

Described resolver output two-way sine and cosine modulated analog signal, described signal conditioning circuit is nursed one's health described two-way sine and cosine modulated analog signal, obtains conditioning back analog signal and transfers to described Digital Signals chip;

Described Digital Signals chip carries out synchronized sampling to described conditioning back analog signal, obtains AD transformation result and output rotor position angle value.

The beneficial effect of the technical scheme that the utility model provides is: the rotor-position that gets access to resolver by the voltage of two-phase secondary induction winding output, this resolver system has saved special use and has resolved chip, improve the control system integrated level and reduced the cost of control system, simple to operate, satisfied the needs in the practical application.

Description of drawings

Fig. 1 is the structural representation of resolver of the prior art;

The structural representation of a kind of resolver system that Fig. 2 provides for the utility model.

In the accompanying drawing, the list of parts of each label representative is as follows:

1: resolver; 2: the Digital Signals chip;

3: signal conditioning circuit.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, below the utility model execution mode is described in further detail.

Referring to Fig. 1 and Fig. 2, a kind of resolver system comprises: resolver 1, Digital Signals chip (DSC) 2 and signal conditioning circuit 3;

The sinusoidal excitation signal of Digital Signals chip 2 modulation output predeterminated frequencies, the conditioning of Digital Signals chip 2 offset of sinusoidal pumping signals, the conditioning back is as the rated voltage of resolver 1; The zero passage moment of sinusoidal excitation signal is as the interrupt signal of Digital Signals chip 2; The timer of Digital Signals chip 2 begins counting as time reference constantly with zero passage, the AD sampling that the 1/4 all after date Digital Signals chips 2 of delaying time are gathered resolver 1 cosine and sine signal;

Resolver 1 output two-way sine and cosine modulated analog signal, 3 pairs of two-way sine and cosines of signal conditioning circuit modulated analog signal is nursed one's health, and obtains conditioning back analog signal and transfers to Digital Signals chip 2;

Analog signal is carried out synchronized sampling after 2 pairs of conditionings of Digital Signals chip, obtains AD transformation result and output rotor position angle value.

Wherein, predeterminated frequency is set according to the needs in the practical application, is generally the 10kHz sinusoidal excitation signal, and this 10kHz sinusoidal excitation signal is through the rated voltage of conditioning to resolver 1 input excitation signal, as the input of resolver 1.

Wherein, the ePWM timer of Digital Signals chip 2 is that time reference begins counting with ω t=0, and the AD sample conversion at time-delay 1/4 all after dates (ω t=pi/2) startup resolver 1 cosine and sine signal realizes the purpose of " peak value sampling " with this.

The two-way sine and cosine modulated analog signal of resolver 1 output must carry out synchronized sampling through the AD ALT-CH alternate channel that can send into Digital Signals chip (DSC) 2 after the conditioning of signal conditioning circuit 3, its input voltage range be 0-3.3V(namely the signal demand after signal conditioning circuit 3 conditionings satisfy the operating voltage of Digital Signals chip 2).Digital Signals chip 2 reads the AD transformation result and carries out arctangent cp cp operation, finally obtains the rotor position angle value.

The model of above-mentioned device is selected according to the needs in the practical application, if the device that can satisfy above-mentioned functions all can, the utility model embodiment does not limit this.

The course of work of this resolver system of the following detailed description, see for details hereinafter and describe:

During resolver 1 operate as normal, elementary excitation winding (R1-R2) impressed frequency is that 10kHz, effective value are the sinusoidal voltage (E of 7V _R1-R2); Two-phase secondary induction winding (S1-S3, S2-S4) output voltage (E _S1-S3, E _S2-S4) change along with the angle theta between rotor and elementary excitation winding.The sinusoidal excitation voltage peak-to-peak value of resolver 1 is 20V.

Be that example describes by Digital Signals chip 2(the utility model embodiment with TMS320F28335 model control chip, during specific implementation, select the model of chip according to the needs in the practical application, the utility model embodiment does not limit this) high accuracy pulsewidth modulation (HRPWM) produce the 10kHz sinusoidal excitation signal, through the voltage signal of signal condition to resolver 1 input 0-20V peak value, as the input of resolver 1.

Utilize the AD conversion range of Digital Signals chip 2 through the voltage signal of the sine and cosine modulated analog signal after nursing one's health for DC component 1.65V, maximum amplitude 1.5V as far as possible, its voltage range is limited between the 0.15V to 3.15V, satisfies the area requirement of ADC input voltage 0-3.3V.Sampled value is input to calculating use in the Digital Signals chip 2, obtains AD transformation result and output rotor position angle value.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, above-mentioned the utility model embodiment sequence number does not represent the quality of embodiment just to description.

The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims

1. a resolver system is characterized in that, comprising: resolver, Digital Signals chip and signal conditioning circuit;

The sinusoidal excitation signal of described Digital Signals chip modulation output predeterminated frequency, described Digital Signals chip is nursed one's health described sinusoidal excitation signal, and the conditioning back is as the rated voltage of described resolver; The zero passage moment of described sinusoidal excitation signal is as the interrupt signal of described Digital Signals chip;

The timer of described Digital Signals chip begins counting as time reference constantly with zero passage, and the described Digital Signals chip of 1/4 all after dates of delaying time is gathered the AD sampling of described resolver cosine and sine signal; Described resolver output two-way sine and cosine modulated analog signal, described signal conditioning circuit is nursed one's health described two-way sine and cosine modulated analog signal, obtains conditioning back analog signal and transfers to described Digital Signals chip;