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双极性步进电机（两相四线步进电机），原理的东西就先不讲太多了，还没搞清楚，边查资料边写代码来理解吧。

此电路使用4片CMS6324去驱动2个H桥，每片CMS6324驱动的桥的同一侧，其自带硬件死区，所以不需要考虑死区插入的问题。如果不是这样的电路，则需要注意上下桥臂同时导通短路的问题。

一、电机基本原理图 内部简化图

四拍，每个脉冲转 1.8°

八拍，每个脉冲转 0.9°

二、简单的驱动代码

#define MOTOR_A_P_PORT          PORT1   //P15 A+
#define MOTOR_A_P_PIN           PIN5#define MOTOR_A_N_PORT          PORT1   //P14 A-
#define MOTOR_A_N_PIN           PIN4#define MOTOR_B_P_PORT          PORT1   //P13 B+
#define MOTOR_B_P_PIN           PIN3#define MOTOR_B_N_PORT          PORT1   //P12 B-
#define MOTOR_B_N_PIN           PIN2#define MOTOR_A_P__SET()        PORT_SetBit(MOTOR_A_P_PORT, MOTOR_A_P_PIN)
#define MOTOR_A_P__RESET()      PORT_ClrBit(MOTOR_A_P_PORT, MOTOR_A_P_PIN)#define MOTOR_A_N__SET()        PORT_SetBit(MOTOR_A_N_PORT, MOTOR_A_N_PIN)
#define MOTOR_A_N__RESET()      PORT_ClrBit(MOTOR_A_N_PORT, MOTOR_A_N_PIN)#define MOTOR_B_P__SET()        PORT_SetBit(MOTOR_B_P_PORT, MOTOR_B_P_PIN)
#define MOTOR_B_P__RESET()      PORT_ClrBit(MOTOR_B_P_PORT, MOTOR_B_P_PIN)#define MOTOR_B_N__SET()        PORT_SetBit(MOTOR_B_N_PORT, MOTOR_B_N_PIN)
#define MOTOR_B_N__RESET()      PORT_ClrBit(MOTOR_B_N_PORT, MOTOR_B_N_PIN)PORT_Init(MOTOR_A_P_PORT, MOTOR_A_P_PIN, OUTPUT); //P15 A+PORT_Init(MOTOR_A_N_PORT, MOTOR_A_N_PIN, OUTPUT); //P14 A-PORT_Init(MOTOR_B_P_PORT, MOTOR_B_P_PIN, OUTPUT); //P13 B+PORT_Init(MOTOR_B_N_PORT, MOTOR_B_N_PIN, OUTPUT); //P12 B-PORT_Init(PORT3, PIN0, OUTPUT); //P30 CMS6021 POWER_EN， 使能CMS6324供电PORT_SetBit(PORT3, PIN0);while(1){#if (0) 													//四拍#if (0) 													//四拍正转//A+MOTOR_A_P__SET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B+MOTOR_A_P__RESET();MOTOR_B_P__SET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//A-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__SET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__SET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);#else   													//四拍反转//A+MOTOR_A_P__SET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__SET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//A-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__SET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B+MOTOR_A_P__RESET();MOTOR_B_P__SET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);#endif#else   													//八拍#if (0) 													//八拍正向//A+MOTOR_A_P__SET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//A+ B+MOTOR_A_P__SET();MOTOR_B_P__SET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B+MOTOR_A_P__RESET();MOTOR_B_P__SET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B+ A-MOTOR_A_P__RESET();MOTOR_B_P__SET();MOTOR_A_N__SET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//A-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__SET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//A- B-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__SET();MOTOR_B_N__SET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__SET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B- A+MOTOR_A_P__SET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__SET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);#else 														//八拍反向//A+MOTOR_A_P__SET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B- A+MOTOR_A_P__SET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__SET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__RESET();MOTOR_B_N__SET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//A- B-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__SET();MOTOR_B_N__SET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//A-MOTOR_A_P__RESET();MOTOR_B_P__RESET();MOTOR_A_N__SET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B+ A-MOTOR_A_P__RESET();MOTOR_B_P__SET();MOTOR_A_N__SET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//B+MOTOR_A_P__RESET();MOTOR_B_P__SET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);//A+ B+MOTOR_A_P__SET();MOTOR_B_P__SET();MOTOR_A_N__RESET();MOTOR_B_N__RESET();UserTimer_Reset(&timer_delay);while(UserTimer_Read(&timer_delay) < TIMEOUT_1MS);#endif#endif}

黄波形为 A+

蓝波形为 B+

紫波形为 A-

绿波形为 B-

四拍正转，每个正脉冲转1.8°，360°/1.8°=200个脉冲转一圈。一次循环A+ B+ A- B-四个脉冲，循环50次即转一圈。

四拍反转。四拍时，1ms切换太快了，会严重丢步，转动非常卡顿，将延时即切换时间适当拉长可获得较为平顺的效果。但导通时间过长会导致总电流很大。

八拍正转。拍数增加，转动相较于4拍平顺了不少

八拍反转

三、抓取步进电机驱动芯片/驱动器的四线波形进行对比

正转。可见，大体思路和上面的是一致的，只不过为了驱动更平顺以及功耗的考虑，各线通电时不是恒导通的，而是以PWM的方式进行输出

反转

每一相通电时，其正占空比都是先增后减，即电流先增后减

当速度提高，换相频率变高。一般地，功率也需要提高，速度不变负载增加，功率也需提高（需要接编码器），所以正占空比(平均)也变大了，电流变大

以上为波形研究，待续