Control system and control method

A control method, wherein the control method is used for controlling a motor, the motor is controlled by a control system, and the control system comprises a central processing module and a drive control module;

• when the motor is running, the drive control module is configured to sample a voltage of a phase coil of the motor, to which no voltage is applied, during a period in which no voltage is applied to any phase coil of the motor, and convert the voltage of the phase coil of the motor, to which no voltage is applied, into a digital signal;
• the control system is configured to store the digital signal, and update the digital signal in real time during the period in which no voltage is applied to any phase coil of the motor;
• the central processing module is configured to read the digital signal and perform the control method, and the control method comprises the following steps:
• a1, reading a preset threshold bemfthr;
• a2, reading a digital signal bemfi, wherein i represents the number of times the digital signal is read, and i=1, 2 . . . ;
• a3, converting, according to an abnormality probability, the digital signal bemfi, into a corresponding conversion value EQUIbemfi, wherein i represents the number of times the digital signal is read, and i=1, 2 . . . ;
• a4, calculating an accumulated value bemftotali according to an equation bemftotali=bemftotali-1+EQUIbemfi, wherein i represents the number of times the digital signal is read, i=1, 2 . . . , bemftotali-1 is a previous accumulated value, and when i=1, the accumulated value bemftotal0=0;
• a5, comparing the accumulated value bemftotali with the preset threshold bemfthr;
• and
• a6, determining whether an absolute value of the accumulated value bemftotali is greater than an absolute value of the preset threshold bemfthr, and if yes, determining an operating state of the motor, and otherwise proceeding to Step a2.

A control method, wherein the control method is used for controlling a motor, the motor is controlled by a control system, and the control system comprises a central processing module and a drive control module;

• when the motor is running, the drive control module is configured to sample a voltage of a phase coil of the motor, to which no voltage is applied, during a period in which no voltage is applied to any phase coil of the motor, and convert the voltage of the phase coil of the motor, to which no voltage is applied, into a digital signal;
• the control system is configured to store the digital signal, and update the digital signal in real time during the period in which no voltage is applied to any phase coil of the motor;
• the central processing module is configured to read the digital signal and perform the control method, and the control method comprises the following steps:
• a1, reading a preset threshold bemfthr and setting an initial value bemftotal0;
• a2, reading a digital signal bemfi, wherein i represents the number of times the digital signal is read, and i=1, 2 . . . ;
• a3, converting, according to an abnormality probability, the digital signal bemfi, into a corresponding conversion value EQUIbemfi, wherein i represents the number of times the digital signal is read, and i=1, 2 . . . ;
• a4, calculating an accumulated value bemftotali according to an equation bemftotali=bemftotali-1+EQUIbemfi, wherein i represents the number of times the digital signal is read, i=1, 2 . . . , bemftotali-1 is a previous accumulated value, and when i=1, the accumulated value bemftotali=bemftotal0+EQUIbemfi;
• a5, comparing the accumulated value bemftotali with the preset threshold bemfthr;
• and
• a6, determining whether an absolute value of the accumulated value bemftotali is greater than an absolute value of the preset threshold bemfthr by the central processing module, and if yes, determining an operating state of the motor, and otherwise proceeding to Step a2.