Motor malfunction monitoring device, drive motor system and motor malfunction monitoring method

A method for monitoring malfunction in a drive motor, comprising:

• pre-storing a first database of normal operation spectrums obtained during normal operation of the drive motor;
• detecting vibration in one or more components of the drive motor in a first direction and a second direction;
• detecting a voltage or a current of the drive motor;
• acquiring operation data of the drive motor, wherein the operation data comprises a vibration signal, and at least one of a voltage signal and a current signal;
• extracting operation data spectrums from the operation data;
• and
• comparing the operation data spectrums with normal operation spectrums in the first database to obtain a similarity, when the similarity is lower than a predetermined threshold, determining that the drive motor is malfunctioning;
• and
• when determining that the drive motor is malfunctioning, comparing the operation data spectrums with known malfunction spectrums stored in a second database comprising known malfunction spectrums of different types of malfunctions of the drive motor, and determining a malfunction type of the drive motor.