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Force Plus Force: Key Tips for Selecting Gear Reducers
Release time:
2021-05-27
The selection principles for gear reducers are primarily based on the characteristics of the gear reducer itself and the load, as well as the nature of the power supply. During operation, the reducer must not be replaced arbitrarily. Gear reducer Motor with a nameplate that does not match.
1. Select based on the power supply.
Electric motor The power supply can be either single-phase or three-phase. Most single-phase power supplies operate at 220 volts, though in many applications, 12-, 24-, 36-, 42-, or 110-volt systems are also used. Abroad, 100- or 220-volt systems are also common. Three-phase motors typically use a three-phase 380-volt power supply, but three-phase systems operating at 36, 42, or 220 volts are also employed in some cases.
In Frequency On the one hand, China and some *** countries adopt a frequency of 50 Hz, while other countries around the world, such as those in Europe and the U.S., use 60 Hz. Therefore, before using an electric motor, you should first verify whether its operating voltage (the rated voltage indicated on the nameplate) and frequency match those of the power supply. If the power supply voltage differs significantly—either much higher or much lower—from the motor’s rated voltage, the motor could be damaged or even burned out.
When providing the design, the motor is allowed to operate normally even if the supply voltage fluctuates by ±5% without affecting its normal operation. This ensures that the motor can function properly without altering its performance.
2. Select based on the motor’s starting conditions.
For motors that are frequently started—specifically, those with a starting frequency of 10 to 20 times per minute—when selecting a motor, it is advisable to choose one with a slightly larger capacity. This is because the starting current during motor startup is relatively high, which in turn results in a higher input power. Therefore, by selecting a motor with a larger rated power, the ratio of the load power to the motor’s rated power will be smaller, thus preventing the motor from overheating excessively.
3. Select based on matching with the load.
When selecting a capacitor-run induction motor, its rated power should roughly match the load power; it should not have excessive margin. This is because, when running at no load or near no load, a capacitor-run motor experiences relatively higher losses, leading to a higher temperature rise. If the motor operates under such conditions for an extended period, its temperature may exceed the allowable limit, accelerating insulation aging and, in severe cases, even causing the motor to burn out.
4. Select based on the overload torque conditions of the load.
Under conditions where the load torque frequently exceeds the rated torque, it is not advisable to use single-phase capacitor-start induction motors or capacitor-start induction motors. This is because when the load torque surpasses the motor’s rated torque, the motor speed may drop to 75%–80% of the synchronous speed or even lower. In such cases, the motor’s centrifugal switch might re-close.
If this situation occurs frequently or lasts for a relatively long time each time, the starting winding will be re-energized. Since, during the design phase, Electric motor The starting winding is only engaged for a short period of time, and its current density is relatively high. If it operates for too long, there’s a risk of burning out the starting winding; therefore, motors of other types must be selected instead.
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