The motor manufacturer invented to choose a suitable inverter for the entire frequency conversion speed control system, which is a problem that manufacturers often encounter.The motor manufacturer reminds that, in general, the selection of the frequency converter should be based on the example of the controlled tool, the range of speed regulation, the static speed accuracy, the starting torque, etc., so that it can satisfy the process and production requirements while at the same time. Useful and economical.
The history summarized by the motor manufacturer is: the size of the motor is the size of the inverter, and sometimes the size can be larger.Moreover, motor manufacturers need to think about it. The low power factor of the inverter for the high-power variable-frequency speed-regulating motor is most attributable to the installation of an exchange reactor at the input end of the inverter.One is to improve the power factor, and the other is to suppress high-frequency harmonics.
You can choose from the following aspects: If you often start and brake frequently, you must install a braking unit and a braking resistor.If you need to reduce noise, you can choose a water-cooled inverter; if you need to brake, you need to choose a brake chopper and a brake resistor.If there is only a DC power supply on site, you can choose a pure inverter product (using DC power) to drive the motor.
The final basis for the selection of the inverter is that the current bias line of the inverter includes the current bias line of the machine load.The following is a list of some practical problems that manufacturers need to pay attention to when choosing inverters.
1. The goal of recycling frequency conversion; constant voltage control or constant current control, etc. 2. Load examples of the frequency converter; such as vane pumps or positive displacement pumps, etc., pay special attention to the function deviation line of the load. The function deviation line determines the method and essentials of the application.
3. The matching problem between the inverter and the load; voltage matching; the rated voltage of the inverter matches the rated voltage of the load.
Current matching: For ordinary centrifugal pumps, the rated current of the frequency converter matches the rated current of the motor.To deal with extraordinary loads such as deep water pumps, it is necessary to refer to the motor performance parameters to determine the inverter current and overload capability with the maximum current.
Torque matching; this kind of environment is probably produced under constant torque load or when there is a deceleration device.
For some places with strict requirements on the motor behavior control system, it is necessary to accurately detect the result of the selection of the inverter. The direct method is to conduct the test through the motor test system.But in order to complete the overall test of the inverter and the motor system, higher requirements are put forward for the motor test system, such as high-bandwidth, high-precision electrical parameter measurement, and multi-channel synchronous testing.
To customize the frequency conversion speed motor, you should choose a motor manufacturer with strength and promise. This not only guarantees the quality of the motor, but also provides a better guarantee for technical consultation and service.
