Troubleshooting Servo Motors and Stepper Motors


The investigating guide plots a complete assortment of motors issues. By and large, the classes are orchestrated by side effects offering brief proposals concerning what to search for when researching motor disappointments and frequently giving guidance on the best remedy for the issue once it has been distinguished.

Motor shuts off before reaching its maximum Speed

  • Motors make a humming sound (a single-phase motor)
    • Run winding may have a loose connection – disassemble motor to make the suitable repair
    • Run winding is torn out - motor must be replaced or rewound
  • Over-loaded
    • Lessen the load.
  • Excessively low voltage.
    • A reasonable over-load or voltage drop of 10-15% will decrease speed by just 1 to 2 percent.
    • A report of any more drops would be objectionable.
  • Inaccurate procedure for estimating RPM
    • Check meter by using another gadget or process
  • Wrong connections
  • Not good quality capacitor


Motors Shuts off after reaching a Maximum speed

A. Over-load
B. Bearings
C. defective overload protection
D. fuses


Motor Starts Slowly

At least 10 seconds on small motors- at least 15 seconds on bigger motors
A. bad capacitor
B. Over-loaded
C. Low voltage
D. Wrong connections
E. Across the line begin.
    • Unnecessary voltage drop (5-10% voltage drop causes 10-20% or more drop in beginning torque).
    • Check connections between supply and motor.
    • Check conductor estimate between control supply and motor.
    • Check with control organization.
    • High Inertia Load.
    • Decrease starting load.
    • Increase in motor size.

F. Decreased voltage starter
    • Loss of beginning torque
G. Y-Delta - beginning torque decreased to 33%.
    • Decrease starting load
    • Increase in motor size.

Servo Motor Running Hot

DC motor running hot is a serious issue that can help in the long run, prompt a catastrophic failure for the motors or even different parts of the machine. This issue of overheating can be caused by an overcurrent condition in the machine. Mechanical binding, brake issues or over-burden issues ought to be investigated first. When every single mechanical issue has been discounted, it is imperative to examine the yield shaft of the motors and turn it to check for bearing failure. Next, you will need to check the windings for any issues, for example, contamination or internal shorts.

Servo Motor Chatter

This issue can be either intermittent or steady yet is portrayed by the motors stopping and making a humming noise. The DC motors output shaft will regularly be at a stop, however, oscillate somewhat. This chattering is typically caused by a situating mistake. Presently this might be caused due to a set-up issue or loss of parameters inside the drive module. The main activity would go through the set-up methodology for the motors and drive that you are working with – particularly if the drive has an auto-tune highlight. If the drive had been unintentionally reset, this will no doubt solve the issue. If not, the servo most likely has a feedback failure and will require repair.

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