Electric Motor Blog

If a compressor motor cannot start against tank pressure, the cause is usually not the motor's power. The most common causes are a faulty unloader or check valve, low supply voltag... More Details

A long starting time on a large fan usually indicates not that the motor is too small, but that the impeller's inertia is large. The real question is whether the motor's winding an... More Details

In fan drives, a direct-coupled motor is the right choice if the speed the fan needs matches a standard motor speed (about 3,000, 1,500 or 1,000 rpm), if the air moved is clean eno... More Details

On greenhouse and poultry house fans, the propeller speed must be kept, because the propeller diameter and blade angle were chosen for a particular speed: if the speed rises the mo... More Details

The motor of a boiler induced draft fan is selected according to the shaft power at cold start-up, when the fan moves its densest air, the speed the impeller was designed for and t... More Details

In an oven circulation fan, heat reaches the motor in three ways: by conduction through the fan shaft and mounting plate, by radiation from the hot oven casing, and through the war... More Details

To replace a burnt-out motor on an axial fan, fit a motor with the same power, the same number of poles, the same shaft diameter and length, and suitable for the same mounting orie... More Details

No; a larger motor running at the same speed does not increase the flow of a centrifugal pump. How much water the pump delivers is determined not by the motor's power but by the im... More Details

When replacing a jockey pump motor, the power is kept the same as on the old motor's nameplate; the two issues that really need attention are mounting compatibility and how many ti... More Details

Motor selection for a hot oil (thermal oil) circulation pump rests on two facts: the pump is under the most strain at a cold start, when the oil is thick, and the motor sees the he... More Details

The motor of a chemical transfer pump is selected according to the conditions of the environment, not of the pump. The pump's power and speed are determined by the fluid's density,... More Details

When replacing the motor of a multistage high-pressure pump, the three most critical points are these: the new motor's speed must be very close to the old one, because as the numbe... More Details

If a conveyor will not start under load, the first step is not to fit a bigger motor or change the gear ratio but to find out what is preventing the start. In most cases the proble... More Details

On a rebar bending machine, motor and gearbox compatibility is checked at three points: does the new motor run at the input speed the gearbox expects, do its flange and shaft physi... More Details

When buying a spare motor for a rebar cutting machine, three pieces of information give a sufficient start: the power and speed on the old motor's nameplate, the way the motor is a... More Details

The motor of a hydraulic press pump is chosen not by multiplying the press's highest pressure by its highest flow, but by the power the pump actually draws at each step of the cycl... More Details

When the fan motor of an air handling unit is replaced, the new motor must match not only in power and speed but also work with the existing fan's mechanical connection and with th... More Details

When choosing the motor for a dust collection extractor, many people treat a dirty filter as the worst case. For radial fans the opposite is true: when the filter is clean or a bag... More Details

When choosing the motor for a centrifugal (scroll-housing) fan, first find the speed at which the impeller must turn, then calculate the power the fan draws at that speed, and fina... More Details

A jaw crusher is the machine that breaks large rock at the first stage in quarries and crushing-screening plants. The moving jaw is pushed towards the fixed jaw by an eccentric sha... More Details