List of DC motor parameter terms
2020年2月14日List of DC motor parameter terms: 1, Assigned power rating. Nominal power. Or rated power. The ideal power when designing the motor system is also the maximum power under the recommended operating conditions. POWER RATING is power. 2, Nominal voltage. Rated voltage. Or working voltage, recommended voltage. Because general motors can work at different voltages, but the voltage is directly related to the speed, and other parameters also change accordingly, this voltage is only a recommended voltage. Other parameters are also given at this recommended voltage. NOMINAL by name. 3. No load speed.
No-load speed, or no-load speed. The unit is RPM. revolutions per minute R here is not the meaning of RATE speed, but the meaning of REVOLUTION rotation. That is how many revolutions per minute. The no-load speed has no reverse torque, so the output power and stalled condition are different. This parameter only provides a function of the maximum speed of the motor at the specified voltage. Generally, 6000 revolutions, ah, 12000 revolutions are given outside, which refers to this parameter. 4. Stall torque Stall torque. This is an important parameter for many motors with a load. That is, the moment when the motor is stopped by a reverse external force. If the motor stall occurs frequently, it will damage the motor or burn the driver chip. So when you choose the motor, this is the first parameter to consider in addition to the speed. 5, Speed / torque gradient. If the speed is the Y axis and the torque is the X axis, in general, the motor first has a line parallel to the X axis, and then it drops a bit like the negative exponential form of E. That is, the product of speed and torque decreases with increasing torque. Motor manufacturers recommend that the motor be operated within that line parallel to the X axis. In this range, the current of the motor will not cause the motor to overheat and burn. 6. No load current. No-load current. Or idling current. As mentioned earlier, current and torque are closely related. No-load current must exist, and the energy formed by the product of voltage and voltage is mainly divided into potential energy and heat energy consumption.
Thermal energy is the heating of the motor coil. The better the motor, the smaller the value at no load, and the potential energy refers to the energy to overcome friction, the inertia of the rotor itself, and the potential energy of the rotor itself. In general, when the speed is constant, the inertia energy of the rotor is almost not increased, and this potential energy mainlyVentilation fan motor suppliers https://www.chinakxdq.com/product/ventilation-fan-motor/ overcomes the problem of friction and eventually dissipates in the form of thermal energy, so the smaller the no-load current, the better the performance of the natural motor, especially The lower the no-load current of the motor on the gearbox, the better the gearbox is made. Of course, the larger the gearbox ratio, the greater the resistance in the same design mode. 7. Starting current. Starting current. This parameter is also important. The problem of inertia of the rotor mentioned above is more manifested here. A good motor has a smaller starting current under the same acceleration, and a poor motor is not mentioned. As a car drive, it starts like a cow when it starts, and it does not have the rushing feel of a racing car. 8, Terminal resistance, motor resistance. Hehe, I can’t translate this well. It is given in the Chinese manual of MAXON. The term TERMINAL means terminal, and it can also be regarded as the resistance between the two output terminals of the motor. Actually the same. However, you must not think that this value is the idling current after dividing the rated voltage. Because the motor still has electromotive force in it. There is also heat energy consumption. 9 Max permissible speed. This parameter generally has no effect. Because the speed is controlled by voltage, this situation usually occurs in two cases. One is that you are not honest, you have to apply too high a voltage. The second is very unfortunate. The external energy drives the motor, and it also produces such a speed. The general consequence of exceeding this speed is mechanical damage. But this rarely happens. General motors do not have this parameter. 10. Max continuous current. Maximum continuous current. This current mainly refers to the current that occurs when there is a reverse external force, such as when there is a load. This is also a parameter to consider. Generally, the product of this current and voltage is less than the rated power. This does not mean that the motor has a loss ratio, but it works under high current for a long time, such as at the rated power, which will cause the temperature to rise. The direct consequence is increased resistance. Reduced efficiency and reduced overall performance, with the potential to damage equipment. Working at this value generally guarantees long-term normal operation. 11. Max continuous torque. Maximum continuous torque. It has almost the same effect as the maximum continuous current. I won’t say any more. This value has a more direct relationship with the maximum continuous current, but it is not completely equal. After all, there is heat dissipation. 12.
Max power output at norminal voltage. Maximum output power at rated voltage. In fact, there is a difference between this power and the rated power. This power often does not consider safety, and it is definitely not a value that can be maintained for a long time. It is also often a measured value at 25 degrees room temperature. But this power is often larger than the rated power. According to the information I see, such as the MAXON model, the rated power is 150W, and this value is 491W in one. 13. Max efficiency. Maximum efficiency. It is usually measured at room temperature. Voltage multiplied by current, multiplied by the output power. However, if the motor is running for a long time, this efficiency will be lowered, of course not a lot, unless your motor can already roast potato. This parameter is generally used to calculate the corresponding relationship between several values, such as the relationship of voltage, current and speed torque. 14. Torque constant. Torque constant. This does not mean static torque. The unit is N.M / A and so on.
That is, the torque value per A, or milliamps, this is also an auxiliary parameter, not much use, but to choose a good motor, this value is also a parameter that can be considered. In fact, in actual measurement, this value is not a constant. 15. Speed constant. Speed constant, that is, RPM / V, how much the rotation speed increases for each 1V increase. In fact, as above, the range of its constant value is also limited. Don’t expect 100 times the speed when you add 100 times the voltage. Generally, the higher the voltage is, the lower this value is. 16. Mechanical time constant. Mechanical time constant. 17, rotor inertia rotor inertia. As mentioned before, accelerate and decelerate. If the load is no-load, the smaller the value, the better. But if your load inertia is large and the value is already relatively large, burn the money to reduce this value It doesn’t make much sense. 18. Terminal inductance Motor inductance. 19 thermal resistance housing -ambient Thermal resistance from the motor housing to the environment. This value is actually quite impressive. But generally there are no motors. Because this value is the heat generation under unit power wattage without heat dissipation, naturally, the smaller the better. 20, thermal resistance rotor-housing Thermal resistance from rotor to casing. Basically the same as above. Small is better than big. 21, thermal time constant winding The thermal time constant of the winding is the time that the winding temperature changes. Is how many degrees per second.
No-load speed, or no-load speed. The unit is RPM. revolutions per minute R here is not the meaning of RATE speed, but the meaning of REVOLUTION rotation. That is how many revolutions per minute. The no-load speed has no reverse torque, so the output power and stalled condition are different. This parameter only provides a function of the maximum speed of the motor at the specified voltage. Generally, 6000 revolutions, ah, 12000 revolutions are given outside, which refers to this parameter. 4. Stall torque Stall torque. This is an important parameter for many motors with a load. That is, the moment when the motor is stopped by a reverse external force. If the motor stall occurs frequently, it will damage the motor or burn the driver chip. So when you choose the motor, this is the first parameter to consider in addition to the speed. 5, Speed / torque gradient. If the speed is the Y axis and the torque is the X axis, in general, the motor first has a line parallel to the X axis, and then it drops a bit like the negative exponential form of E. That is, the product of speed and torque decreases with increasing torque. Motor manufacturers recommend that the motor be operated within that line parallel to the X axis. In this range, the current of the motor will not cause the motor to overheat and burn. 6. No load current. No-load current. Or idling current. As mentioned earlier, current and torque are closely related. No-load current must exist, and the energy formed by the product of voltage and voltage is mainly divided into potential energy and heat energy consumption.
Thermal energy is the heating of the motor coil. The better the motor, the smaller the value at no load, and the potential energy refers to the energy to overcome friction, the inertia of the rotor itself, and the potential energy of the rotor itself. In general, when the speed is constant, the inertia energy of the rotor is almost not increased, and this potential energy mainlyVentilation fan motor suppliers https://www.chinakxdq.com/product/ventilation-fan-motor/ overcomes the problem of friction and eventually dissipates in the form of thermal energy, so the smaller the no-load current, the better the performance of the natural motor, especially The lower the no-load current of the motor on the gearbox, the better the gearbox is made. Of course, the larger the gearbox ratio, the greater the resistance in the same design mode. 7. Starting current. Starting current. This parameter is also important. The problem of inertia of the rotor mentioned above is more manifested here. A good motor has a smaller starting current under the same acceleration, and a poor motor is not mentioned. As a car drive, it starts like a cow when it starts, and it does not have the rushing feel of a racing car. 8, Terminal resistance, motor resistance. Hehe, I can’t translate this well. It is given in the Chinese manual of MAXON. The term TERMINAL means terminal, and it can also be regarded as the resistance between the two output terminals of the motor. Actually the same. However, you must not think that this value is the idling current after dividing the rated voltage. Because the motor still has electromotive force in it. There is also heat energy consumption. 9 Max permissible speed. This parameter generally has no effect. Because the speed is controlled by voltage, this situation usually occurs in two cases. One is that you are not honest, you have to apply too high a voltage. The second is very unfortunate. The external energy drives the motor, and it also produces such a speed. The general consequence of exceeding this speed is mechanical damage. But this rarely happens. General motors do not have this parameter. 10. Max continuous current. Maximum continuous current. This current mainly refers to the current that occurs when there is a reverse external force, such as when there is a load. This is also a parameter to consider. Generally, the product of this current and voltage is less than the rated power. This does not mean that the motor has a loss ratio, but it works under high current for a long time, such as at the rated power, which will cause the temperature to rise. The direct consequence is increased resistance. Reduced efficiency and reduced overall performance, with the potential to damage equipment. Working at this value generally guarantees long-term normal operation. 11. Max continuous torque. Maximum continuous torque. It has almost the same effect as the maximum continuous current. I won’t say any more. This value has a more direct relationship with the maximum continuous current, but it is not completely equal. After all, there is heat dissipation. 12.
Max power output at norminal voltage. Maximum output power at rated voltage. In fact, there is a difference between this power and the rated power. This power often does not consider safety, and it is definitely not a value that can be maintained for a long time. It is also often a measured value at 25 degrees room temperature. But this power is often larger than the rated power. According to the information I see, such as the MAXON model, the rated power is 150W, and this value is 491W in one. 13. Max efficiency. Maximum efficiency. It is usually measured at room temperature. Voltage multiplied by current, multiplied by the output power. However, if the motor is running for a long time, this efficiency will be lowered, of course not a lot, unless your motor can already roast potato. This parameter is generally used to calculate the corresponding relationship between several values, such as the relationship of voltage, current and speed torque. 14. Torque constant. Torque constant. This does not mean static torque. The unit is N.M / A and so on.
That is, the torque value per A, or milliamps, this is also an auxiliary parameter, not much use, but to choose a good motor, this value is also a parameter that can be considered. In fact, in actual measurement, this value is not a constant. 15. Speed constant. Speed constant, that is, RPM / V, how much the rotation speed increases for each 1V increase. In fact, as above, the range of its constant value is also limited. Don’t expect 100 times the speed when you add 100 times the voltage. Generally, the higher the voltage is, the lower this value is. 16. Mechanical time constant. Mechanical time constant. 17, rotor inertia rotor inertia. As mentioned before, accelerate and decelerate. If the load is no-load, the smaller the value, the better. But if your load inertia is large and the value is already relatively large, burn the money to reduce this value It doesn’t make much sense. 18. Terminal inductance Motor inductance. 19 thermal resistance housing -ambient Thermal resistance from the motor housing to the environment. This value is actually quite impressive. But generally there are no motors. Because this value is the heat generation under unit power wattage without heat dissipation, naturally, the smaller the better. 20, thermal resistance rotor-housing Thermal resistance from rotor to casing. Basically the same as above. Small is better than big. 21, thermal time constant winding The thermal time constant of the winding is the time that the winding temperature changes. Is how many degrees per second.
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