Your location: Home > Solutions > Variable Speed Fan with AC Motor
Disadvantages
of variable speed fan using
AC Motor + individual VFD
- The average lifespan of electrolytic capacitors used most common in VFDs is only a few years.
- If the variable speed motor and VFD are too far apart, the motor will be at higher risk of electrical damage.
- The VFD may generate EMI around the area along power supply cable from VFD to motor.
- The amount of heat generated by VFD, which installed in control cabinet, may shorten the service life of VFD if not properly heat dissipated.
- Long-term low frequency operation of a VFD without protection may damage the motor.
- Using standard V/F control method, VFD can not compensate for the loss of motor rotating speed, which will affect fan air flow with the increase of static pressure.
- The VFD setup is complicated and requires professionals to set up and operate.
- The on-site setting and commission job of VFD are complicated and the workload is large.
- The parameter setting of the VFD is difficult to achieve the best match with the fan.
- The VFD installed in control cabinet requires distribu-tion and protection circuits.
- The installation and commissioning work of VFD is complicated and needs high labor cost.
- Output reactor need to be installed if the variable speed motor and VFD are too far apart.
Advantages of variable speed fan
using AC Motor with Integrated VFD
- The average lifespan of film capacitor used in the integrated VFDs is several times that of electrolytic capacitors commonly used in standard VFDs.
- Insulation designs and materials for AC motors with integrated VFDs are designed for variable frequency use. The stator winding of motor is vacuum impregnated, which greatly improves the insulation performance and extends the life of the motor in a humid environment.
- The AC motors with integrated VFD has good cooling effect due to the airflow of fan.
- The AC motors with integrated VFD has low frequency operation protection to prevent motor damage during low frequency operation due to low variable speed control signal.
- The FOC control method of AC motors with integrated VFD maintain motor speed constant to ensure optimal fan airflow as static pressure increases.
- The setting parameters of the integrated VFD are optimized and set for different models of motors in factory without on-site setting and commissioning.
- Reduces the workload and difficulty of installation, commissioning, use and maintenance.
- The AC motors with integrated VFD has built-in multiple protections without additional protection circuits.
- The AC motors with integrated VFD doesn’ t need control circuit and control cabinet, and reduces the cost of installation and commissioning.
- The AC motors with integrated VFD doesn’ t need output reactor to protect.
Use & Maintenance
Cost
Reliability
Reliability
- The average lifespan of film capacitor used in the integrated VFDs is several times that of electrolytic capacitors commonly used in standard VFDs.
- Insulation designs and materials for AC motors with integrated VFDs are designed for variable frequency use. The stator winding of motor is vacuum impregnated, which greatly improves the insulation performance and extends the life of the motor in a humid environment.
- The AC motors with integrated VFD has good cooling effect due to the airflow of fan.
- The AC motors with integrated VFD has low frequency operation protection to prevent motor damage during low frequency operation due to low variable speed control signal.
Use & Maintenance
- The FOC control method of AC motors with integrated VFD maintain motor speed constant to ensure optimal fan airflow as static pressure increases.
- The setting parameters of the integrated VFD are optimized and set for different models of motors in factory without on-site setting and commissioning. Greatly reduces the workload and difficulty of installation, commissioning, use and maintenance.
Cost
- The AC motors with integrated VFD itself has multiple protections and doesn’ t require additional protection circuits.
- The AC motors wi th integrated VFD doesn’ t need control circuit and control cabinet. Greatly reduces the works of installation and commissioning due to the simplicity.
- The AC motors with integrated VFD doesn’ t need output reactor to protect.
