Correlation and analysis of high speed and performance of electric motors

Correlation and analysis of high speed and performance of electric motors
As the core of electric motorcycles, the performance of the motor is crucial, especially the speed of the motor directly affects the output power and efficiency of the motor. This article mainly gives the specific explanation.
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    The speed of the motor is affected by a variety of factors, including the motor model, voltage, current, load, etc. At the moment, it is also an important technology. Is it true that the higher the speed means the better the performance of the electric motorcycle? In fact, the motor’s good performance is not related to the specific application requirements or motor design.


    The rotational speed of the motorcycle motor

    For synchronous or asynchronous motors, the speed of the motor (electric tricycle motor) is related to the frequency of the power supply and the number of pole pairs of the motor. The higher the frequency of the power supply and the fewer pole pairs, the higher the rotational speed.

    In the case of asynchronous motors, it is also related to the current through the electric coil, the higher the current, the closer its rotational speed is to the synchronous speed.

    There is also a type of motor (usually AC and DC motors), the speed of which is independent of the frequency of the power supply. It is only related to the magnitude of the current passing through the coil.

    The most common are AC asynchronous motors. Its speed is mainly determined by the number of poles and the frequency of power supply, and the frequency of the existing power supply is 50Hz.

    The rotational speed of the motorcycle motor

    The speed of the motor is determined by the structure of the motor and the mode of power supply, and the speed of the general motor is hundreds to thousands of revolutions per minute. The performance of a motor is affected by several factors, including speed, power, efficiency, torque, and more. Here are some relevant considerations:

    The determinant of motor speed

    • Power density

    Higher rotational speeds generally increase the power density of the motor, i.e. the amount of power that can be output per unit volume or unit weight. This can be advantageous for some applications that require high power output, such as high-speed machinery or vehicle powertrains.

    • Dynamic response

    Higher rotational speeds may help improve the motor’s dynamic responsiveness, allowing it to respond more quickly to load changes or achieve precise motion control. This is particularly important for applications that require fast response and high-precision control by electric motorcycle controller.

    • Efficiency

    The efficiency of a motor is usually at its maximum within a specific speed range. In this speed range, the motor can convert input electrical energy into mechanical energy output with high efficiency. However, if the rotational speed exceeds this range, the efficiency of the motor may decrease. Therefore, it is important to choose the right speed to improve the efficiency of the motor.

    • Torque output

    The torque output of a motor is usually related to its rotational speed. In some applications, such as starting or climbing, higher torque output may be required at the expense of some rpm. Therefore, for these applications, low speed, high torque motors may be more suitable.

    The determinant of motor speed

    • Axial load and vibration

    Higher rotational speeds can increase the axial load and vibration experienced by the motor, which can negatively affect the life and reliability of the motor. Therefore, the relationship between speed and load must be balanced according to the specific application requirements and the design parameters of the motor.

    In short, the effect of rotational speed on motor performance is complex, and there is no simple law of consistency. Optimal rotational speed depends on the specific application needs, including factors such as required power, torque, efficiency, and responsiveness.

    Therefore, when selecting a motor, it is necessary to consider the speed and its relationship with other performance indicators to meet the requirements of the specific application. When it comes to motor performance, the impact of rotational speed is complex.

    Specific applications and impacts

    • Power requirements

    Specific applications may have specific power requirements. In some cases, higher rotational speeds can provide greater power output to meet application requirements. However, this does not apply in all cases. Sometimes, lower rpm is required to provide the required power and torque.

    • Power balance

    Motors that rotate at high speeds may require more complex balancing measures to reduce vibration and noise. This may include higher precision bearings, dynamic balancing of rotating parts, etc. Therefore, special attention needs to be paid to the balanced performance of the motor when operating at high speeds.

    Specific applications and impacts

    • Axial and radial loads

    Higher rotational speeds may increase axial and radial loads on the motor. Therefore, the design and selection of motors must ensure that the motor can withstand these loads to prevent motor damage or premature wear.

    • Heat dissipation and cooling

    Higher rotational speeds generate more heat and require a more robust cooling system to ensure that the motor (electric motor for bicycle) operates within an acceptable temperature range. As a result, high-speed motors often require more efficient heat dissipation and cooling measures.

    • Noise and vibration

    Motors that rotate at high speeds may produce more noise and vibration. This may be unacceptable for some applications, so noise and vibration control measures such as acoustic enclosures, shock brackets, motorcycle frame, etc. are required.

    Will the climbing ability of the two-wheeler become stronger

    Electric two-wheelers are an important means of transportation in life. In addition to battery life, the second is power, whether an electric motorcycle runs fast or not, and the strength of climbing ability directly determines the performance of this car. As long as the motor has a higher speed and more torque, the better the climbing ability?

    Speed refers to the speed at which the stator rotates under the magnetic force of the electric vehicle motor, which determines the speed of the electric vehicle. That is, the faster the motor speed, the faster the electric vehicle. The torque of the motor, also called torque, is the force generated when the torque and arm rotate, the greater the torque, the greater the power output of the electric vehicle.

    Will the climbing ability of the two-wheeler become stronger

    The relationship between motor speed and torque is not proportional, but torque can reach maximum within a certain speed range. As the rotational speed increases, the torque decreases gradually.

    What can really determine the climbing ability and speed of an electric vehicle is the power of the electric vehicle motor. That is, how many watts of motor are usually said, 2000W motor and 800W motor.

    However, the advantage of the electric motor is that it can achieve a lot of torque at low speeds, so that two-wheeled electric vehicles can easily outperform gasoline motorcycles at low speeds (50 km/h) on urban roads. An excellent motor that can greatly extend the speed range of the maximum torque output, so that the maximum torque can be released even at medium speeds.

    To sum up, the speed of the electric motorcycle motor is inversely proportional to torque, and the motor’s climbing ability is related to torque. But in the end, it depends on the speed range between power and maximum torque. The faster the speed, the stronger the climbing ability of the motor, which is very one-sided.


    The effect of rotational speed on motor performance is a complex issue that involves balancing multiple factors. When selecting a motor, you need to consider a combination of application requirements, power requirements, torque requirements, balancing performance, load requirements, heat dissipation needs, noise and vibration control, and other factors to find the most suitable speed range for a particular application.

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