If the operation conditions or test locations of the motor are different from the general environmental conditions(electric hub motor for skateboard), the temperature rise limit of the motor in the table shall be corrected. If the specified maximum ambient temperature or the actual maximum cooling medium temperature is in the range of 40-60 ℃(belt motor 6384 190kv), the specified temperature rise limit shall be subtracted from the value of ambient temperature exceeding 40 ℃.
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The motor changes into linear motion through the transmission device of reducer(electric skateboard wireless remote control). Taking fd1-228 model engraving machine as an example, the output power of motor is 1.lkw, and the speed after deceleration is 18r / min. If the specified maximum ambient temperature or the actual maximum cooling medium temperature is within the range of 0-40 ℃(montainskateboard dual motor), the temperature rise limit will not be increased generally.
According to gb5171-87, the temperature rise limits of each part of general motors are listed in the table(6384 sensored motor). According to the different directions of the electromagnetic torque and speed of the motor, there are four operation states of the motor. If the specified motor is used in the range of 1000-4000m altitude(6355 or 6374 brushles motor), and the maximum ambient temperature is not specified, the temperature rise limit will not be corrected.
The rotating speed is positive a > 0, the electromagnetic torque is positive T > 0.ia > 0, and the energy is transferred from the motor to the working machinery(8352 outrunner motor). If the specified maximum ambient temperature or actual maximum cooling medium temperature is more than 60 ℃ or less than 0 ℃ or the altitude of the operation site is more than 4000m(torqueboards 6374 motor), the temperature rise limit shall be determined by the agreement between the manufacturer and the user.
If the ambient temperature of the test site is lower than (or higher than) the maximum ambient temperature specified by the operation site is more than 30K(83mm hub motor), then the temperature rise limit is the original temperature rise after the above correction minus (or plus) a correction value, the motor is in the electric state(5065 skateboard motor), which is 1 / 500 of the above ambient temperature difference value multiplied by the original temperature rise after the correction.
Generally, the following provisions shall be followed for correction(skateboard vesc). At present, if the altitude of the operation site is higher than that of the test site, the temperature rise limit per 100m of the altitude difference will be reduced by 1%. The specified winding temperature rise limit of class F insulation is 100k(3500w electric skateboard motor). With the expansion of motor use, electromagnetic interference, more and more special environments will be created.
For example, the specified ambient temperature for permanent magnet DC motor with class F insulation is 55 ℃, while the test ambient temperature is 25 ℃(mini skateboard remote control). First, according to the difference of specified ambient temperature, the specified temperature rise is 100 - (55-40) = 85K(5065 330kv sensored motor). Then, according to the difference of ambient temperature at the test site, the corrected winding temperature rise limit is 85-85x (55-20) / 500 = 79.05k.
The special environment of micro and special motors can be summarized as: salt spray(electric longboard remote control), damp heat, sand dust, mould, various radiation,acousto-optic electromagnetic wave shock, lightning, temperature shock (alternating high and low temperature shock), low air pressure, vibration, shock, strong impact, constant acceleration (centrifugal), drop (Transportation), swing (ship), explosion, harmful gases and substances, etc(best longboard slide gloves).