Shihlin Electric & Engineering Corporation - Shihlin - Ranked No.1 electrical manufacturer in Taiwan with more than 70 years' experience.

The motor does not turn and there is a buzzing sound after power on | Shihlin Electric

1. Causes of failure ① The rotor winding is broken (one phase is disconnected) or the power supply is lost in one phase; ② The beginning and end of the winding lead wire are connected incorrectly or the internal winding is reversed; ③ The power circuit contact is loose and the contact resistance is large; Large or the rotor is stuck; ⑤ The power supply voltage is too low; ⑥ The assembly of the small motor is too tight or the grease in the bearing is too hard; ⑦ The bearing is stuck. 2. Trouble shooting ① Identify the breakpoint and fix it; ② Check the polarity of the winding; determine whether the end of the winding is correct; ③ Tighten the loose wiring screws, use a multimeter to determine whether each joint is falsely connected, and repair it; And eliminate mechanical failures, ⑤ check whether the specified surface connection is mistakenly connected; if the power supply wire is too thin and the voltage drop is too large, correct it, ⑥ reassemble to make it flexible; replace qualified grease; ⑦ repair the bearing. Find quick answers in the Shihlin Electric FAQ—selection, wiring and troubleshooting for circuit breakers, magnetic contactors, AC drives, servo, HMI and PLC control.

FAQ: The motor does not turn and there is a buzzing sound after power on

Shihlin Electric FAQ: Selection, Wiring & Troubleshooting

The motor does not turn and there is a buzzing sound after power on

1. Causes of failure ① The rotor winding is broken (one phase is disconnected) or the power supply is lost in one phase; ② The beginning and end of the winding lead wire are connected incorrectly or the internal winding is reversed; ③ The power circuit contact is loose and the contact resistance is large; Large or the rotor is stuck; ⑤ The power supply voltage is too low; ⑥ The assembly of the small motor is too tight or the grease in the bearing is too hard; ⑦ The bearing is stuck.

2. Trouble shooting ① Identify the breakpoint and fix it; ② Check the polarity of the winding; determine whether the end of the winding is correct; ③ Tighten the loose wiring screws, use a multimeter to determine whether each joint is falsely connected, and repair it; And eliminate mechanical failures, ⑤ check whether the specified surface connection is mistakenly connected; if the power supply wire is too thin and the voltage drop is too large, correct it, ⑥ reassemble to make it flexible; replace qualified grease; ⑦ repair the bearing.

The motor does not turn and there is a buzzing sound after power on | Shihlin Electric

The Shihlin Electric Company Profile introduces a Taiwan-based manufacturer with 70+ years of engineering experience supporting low-voltage power distribution and motor control for industrial customers.

Our scope covers circuit breakers, switchgear and power distribution systems, magnetic switches and magnetic contactors—plus factory automation solutions including inverters, AC drives, servo motors and drives, HMI, controllers, PLC and system integration.

With long-term OEM/ODM collaboration and a growing global network, Shihlin Electric helps you standardize components, reduce downtime, and move from product selection to commissioning with practical technical support.