TIM3使能

/* PWM1 Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;         
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;        
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;           
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  
  TIM_OC1Init(TIM3, &TIM_OCInitStructure);        
  TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable);      我把该通道使能关了，为什么还可以输出pwm使电机转动啊？？？？？？？？？？

求大神指点啊，，，，，，到底哪个是控制它不转的。。。。。