Method and circuit arrangement for determining incorrect operating state of electrical machine

The disclosure relates to a method for determining an incorrect operating state of an electrical machine (10) with the aid of an electronic circuit (100) having at least one comparator (1). The electrical machine (10) is controlled with a pulse width modulation signal (PWM). The pulse width modulation signal (PWM) is demodulated. A first signal (S1), which represents the demodulated pulse width modulation signal (V10), is compared with a second signal (S2). The second signal (S2) represents a rotational speed or a rotational angle of the electrical machine (10) and/or a current intensity of the electrical machine (10). This comparison is carried out with the aid of the at least one comparator (1). An error signal (ER) is generated based on the comparison in order to determine the incorrectoperating state of the electrical machine (10). 本发明涉及一种用于借助于电子电路（100）确定电机（10）的有错误的运行状态的方法，所述电子电路具有至少一个比较器（1）。首先，所述电机（10）借助脉宽调制信号（PWM）进行控制。所述脉宽调制信号（PWM）被解调。将代表经解调的脉宽调制信号（V10）的第一信号（S1）与第二信号（S2）进行比较。所述第二信号（S2）代表所述电机（10）的转动速度或转角