Torque is the force with which the motor rotates the shaft. It is the torque that determines whether the engine can handle the load. Let's look at how it is related to power and speed.
Relationship of torque, power and speed
Torque, power and speed are connected by a simple relationship: at the same power, the lower the speed, the greater the torque. Therefore, low-speed engines (750 rpm) develop more torque than high-speed engines (3000 rpm) of the same power.
Formula: M ≈ 9550 × P / n, where M is torque in Nm, P is power in kW, n is revolutions in minute.
Example
| Power | Revolutions | Torque (approx.) |
|---|---|---|
| 7.5 kW | 3000 rpm | ~24 Nm |
| 7.5 kW | 1500 rpm | ~48 Nm |
| 7.5 kW | 750 rpm | ~95 Nm |
Practical meaning
When choosing an engine, not only power is important, but also speed - they set the torque. For mechanisms that require a lot of force at low speed, low-speed motors are chosen or a gearbox is installed. An error in choosing the speed leads to a lack of torque: the engine does not pull and overheats.
Understanding the torque helps when selecting a replacement engine - the speed should match the original one. If the engine cannot cope with the load, it may be due to incorrect selection or a malfunction, which will be shown by diagnostics.
Do you need help selecting an engine based on torque in Tashkent? Elektromotors engineers will advise - contact us.