关于pmsm3_3例程中旋变激励输出正弦波的频率

按照下面的计算，应该可以通过PWM7和8引脚用示波器看到频率为freq_exc的正弦波，为什么仿真结果不对呢？比如说当freq_exc = 5 时，理论上应该是5k，但是示波器上输出的却是10k。这是什么情况？

float Ts = 0.001/RESOLVER_PWM_FREQUENCY; /* PWM frequency, see parameter.h */

float freq_exc = RESOLVER_EXCITATION_FREQUENCY*1000; /* Excitation frequency (Hz) */

float amplitude = 1.0; /* Peak value of excitation signal (pu) */

float ang_exc = 0;

_iq sin_sig_ref = 0; /* excitation signal (pu) */

// Excitation signal generation for resolver sensor

sin_sig_ref = _IQmpy(_IQ(amplitude),_IQsinPU(_IQ(ang_exc)));

ang_exc += freq_exc*T;

if (ang_exc >= 1)

ang_exc -= 1;

res_pwm1.signal_ref = _IQtoIQ15(sin_sig_ref);

res_pwm1.update(&res_pwm1);

10#：

看不到你的PWM模块的设置，不能断定问题在哪。

建议将res_pwm1.update()函数的原型以及res_pwm1结构体的定义发出来看一下。

按照下面的计算，应该可以通过PWM7和8引脚用示波器看到频率为freq_exc的正弦波，为什么仿真结果不对呢？比如说当freq_exc = 5 时，理论上应该是5k，但是示波器上输出的却是10k。这是什么情况？

float Ts = 0.001/RESOLVER_PWM_FREQUENCY; /* PWM frequency, see parameter.h */

float freq_exc = RESOLVER_EXCITATION_FREQUENCY*1000; /* Excitation frequency (Hz) */

float amplitude = 1.0; /* Peak value of excitation signal (pu) */

float ang_exc = 0;

_iq sin_sig_ref = 0; /* excitation signal (pu) */

// Excitation signal generation for resolver sensor

sin_sig_ref = _IQmpy(_IQ(amplitude),_IQsinPU(_IQ(ang_exc)));

ang_exc += freq_exc*T;

if (ang_exc >= 1)

ang_exc -= 1;

res_pwm1.signal_ref = _IQtoIQ15(sin_sig_ref);

res_pwm1.update(&res_pwm1);

kui xiao：

回复 10#:

/*—————————————————————————-

Initialization constant for the F28X Timer TxCON for PWM Generation.

Sets up the timer to run free upon emulation suspend, continuous up-down mode

prescaler 1, timer enabled.

—————————————————————————-*/

#define PWM_RESOLVER_INIT_STATE  (FREE_RUN_FLAG +         \

                                 TIMER_CONT_UPDN +        \

                                 TIMER_CLK_PRESCALE_X_1 + \

                                 TIMER_ENABLE_BY_OWN    + \

                                 TIMER_ENABLE )

/*—————————————————————————-

Initialization constant for the F28X ACTRx register for Resolver drive.

Sets up PWM7/8 polarities.

—————————————————————————-*/

#define ACTRB_PWM_RESOLVER_INIT_STATE ( COMPARE1_AL + \

                                       COMPARE2_AH + \

                                       COMPARE3_FL + \

                                       COMPARE4_FL + \

                                       COMPARE5_FL + \

                                       COMPARE6_FL )

/*—————————————————————————–

Define the structure of the RESOLVER_PWM Driver Object

—————————————————————————–*/

typedef struct {  

       int signal_ref;         /* Input: Excitation reference signal (Q15)  */

       int pwm_period;         /* Parameter: PWM Half-Period in CPU clock cycles (Q0)  */

       void (*init)();         /* Pointer to the init function   */

   void (*update)();  /* Pointer to the update function */

       } RESOLVER_PWM ;

/*—————————————————————————–

按照下面的计算，应该可以通过PWM7和8引脚用示波器看到频率为freq_exc的正弦波，为什么仿真结果不对呢？比如说当freq_exc = 5 时，理论上应该是5k，但是示波器上输出的却是10k。这是什么情况？

float Ts = 0.001/RESOLVER_PWM_FREQUENCY; /* PWM frequency, see parameter.h */

float freq_exc = RESOLVER_EXCITATION_FREQUENCY*1000; /* Excitation frequency (Hz) */

float amplitude = 1.0; /* Peak value of excitation signal (pu) */

float ang_exc = 0;

_iq sin_sig_ref = 0; /* excitation signal (pu) */

// Excitation signal generation for resolver sensor

sin_sig_ref = _IQmpy(_IQ(amplitude),_IQsinPU(_IQ(ang_exc)));

ang_exc += freq_exc*T;

if (ang_exc >= 1)

ang_exc -= 1;

res_pwm1.signal_ref = _IQtoIQ15(sin_sig_ref);

res_pwm1.update(&res_pwm1);

kui xiao：

回复 10#:

void F28X_EV2_Resolver_PWM_Init(RESOLVER_PWM *p)

{      

      /* Initialize PWM7/PWM8 (EVB) */

       EvbRegs.T3PR = p->pwm_period;             /* Init Timer 3 period Register  */

       EvbRegs.T3CON.all = PWM_RESOLVER_INIT_STATE;     /* Symmetrical Operation  */

       EvbRegs.COMCONB.all = 0xA200;

       EvbRegs.ACTRB.all = ACTRB_PWM_RESOLVER_INIT_STATE;                

       EALLOW;                       /* Enable EALLOW */

       GpioMuxRegs.GPBMUX.all |= 0x0003;

       EDIS;                         /* Disable EALLOW */

}

void F28X_EV2_Resolver_PWM_Update(RESOLVER_PWM *p)

{      

       long tmp;

       EvbRegs.T3PR = p->pwm_period;        /* Update Timer 3 period Register  */

       tmp = (long)p->pwm_period*(long)(p->signal_ref);

       EvbRegs.CMPR4 = (int)(tmp>>16) + (int)(p->pwm_period>>1);

}

按照下面的计算，应该可以通过PWM7和8引脚用示波器看到频率为freq_exc的正弦波，为什么仿真结果不对呢？比如说当freq_exc = 5 时，理论上应该是5k，但是示波器上输出的却是10k。这是什么情况？

float Ts = 0.001/RESOLVER_PWM_FREQUENCY; /* PWM frequency, see parameter.h */

float freq_exc = RESOLVER_EXCITATION_FREQUENCY*1000; /* Excitation frequency (Hz) */

float amplitude = 1.0; /* Peak value of excitation signal (pu) */

float ang_exc = 0;

_iq sin_sig_ref = 0; /* excitation signal (pu) */

// Excitation signal generation for resolver sensor

sin_sig_ref = _IQmpy(_IQ(amplitude),_IQsinPU(_IQ(ang_exc)));

ang_exc += freq_exc*T;

if (ang_exc >= 1)

ang_exc -= 1;

res_pwm1.signal_ref = _IQtoIQ15(sin_sig_ref);

res_pwm1.update(&res_pwm1);

kui xiao：

回复 10#:

主程序里的主频率为150MHz，计数模块为Eva的T1UFINT，定义的pwm_period的值为3750，PWM波形为对称的，EV中断频率为20kHz，这些应该都没问题的。程序里的"freq_exc"为5k，“T”为1/(20k)。

按照下面的计算，应该可以通过PWM7和8引脚用示波器看到频率为freq_exc的正弦波，为什么仿真结果不对呢？比如说当freq_exc = 5 时，理论上应该是5k，但是示波器上输出的却是10k。这是什么情况？

float Ts = 0.001/RESOLVER_PWM_FREQUENCY; /* PWM frequency, see parameter.h */

float freq_exc = RESOLVER_EXCITATION_FREQUENCY*1000; /* Excitation frequency (Hz) */

float amplitude = 1.0; /* Peak value of excitation signal (pu) */

float ang_exc = 0;

_iq sin_sig_ref = 0; /* excitation signal (pu) */

// Excitation signal generation for resolver sensor

sin_sig_ref = _IQmpy(_IQ(amplitude),_IQsinPU(_IQ(ang_exc)));

ang_exc += freq_exc*T;

if (ang_exc >= 1)

ang_exc -= 1;

res_pwm1.signal_ref = _IQtoIQ15(sin_sig_ref);

res_pwm1.update(&res_pwm1);

user5128243：你好， 请问下可以给我发一份 这个exe文件吗？现在官网无法下载 ，谢谢！yelangxu@163.com