Notes On Motor Operation; Application To Existing Standard Motors - YASKAWA FSDrive-MV1000 Parameter Manual

i.4

Notes on Motor Operation

◆ Application to Existing Standard Motors

■ Insulation Voltage
Consider voltage tolerance levels and insulation in applications with high input voltage or particularly long wiring
distances. Contact Yaskawa for consultation.
High Speed Operation
■
Running a motor beyond its rated speed may lead to problems imposed by vibration or the durability of motor bearings.
Contact the manufacturer of the motor for details.
Torque Characteristics
■
When driven by a drive, the torque characteristics of the motor differ from when it is driven with a commercial power
supply. Therefore, the load torque characteristics that the motor drives need to be confirmed.
Vibration and Shock
■
The PWM control with multiple outputs connected in the drive reduces motor oscillation to the same level as in operation
by commercial power supply. However, the motor oscillation is slightly larger due to the following factors.
• Resonance with the natural frequency of the mechanical system
Take particular caution when using a variable speed drive for an application that is conventionally run by commercial
power at a constant speed. Installing shock absorbing rubber under the base of the motor and using Frequency Jump
function can be effective measures.
• Residual unbalance of the rotating motor
Particular care is required when running the motor beyond its rated speed.
• Subsynchronous Resonance
Subsynchronous resonance may occur in fans, blowers, turbines, and other applications with high load inertia, as well
as in motors with a relatively long shaft. Yaskawa recommends using the closed loop vector control for such
applications.
YASKAWA ELECTRIC EZZ010930 FSDrive-MV1000 Parameter Guide
i.4 Notes on Motor Operation
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