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Performance Comparison For 4 Kind of Driving Motor



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A detailed explanation of the causes of excessive three-phase motor current

When the motor current is high, it is often reflected in the serious heating of the motor. The following seven points basically summarize the reasons for the excessive current of the motor. Let's learn about them. Ⅰ. power supply problem In terms of power supply, the motor may overheat for the following reasons: 1, the power supply voltage is too high When the power supply voltage is too high, the electromotive force, flux and flux density of the motor increase accordingly. Since the size of iron loss is proportional to the square of magnetic flux density, the iron loss increases, leading to overheating of the core. The increase of magnetic flux leads to the sharp increase of excitation current component, resulting in the increase of copper loss of stator windings and overheating of windings. Therefore, when the power supply voltage exceeds the motor's rated voltage, the motor will overheat. 2. Too low power supply voltage When the power supply voltage is...
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Advantages and disadvantages of rare earth permanent magnet synchronous motor compared with squirrel-cage asynchronous motor

A ：high efficiency and energy saving 1) no slip error, no fundamental wave loss of iron and copper on the rotor; 2) the rotor permanent magnet is used for excitation, and the power factor can reach 1, saving the reactive power. On the other hand, the stator current decreases, the stator copper loss decreases, and the efficiency increases. 3) the polar arc coefficient is generally greater than the polar arc coefficient of the asynchronous motor. When the power supply voltage and the stator structure are fixed, the average magnetic density is smaller than the asynchronous motor and the iron loss is smaller. 4) stray loss of rare earth permanent magnet synchronous motor: it is generally believed that the non-sinusoidal magnetic field of the permanent magnet increases the stray loss, but on the other hand, the large air gap of the rare earth permanent magnet synchronous motor reduces the stray loss. B ：small size, light weight, high power density 1) analysis from the persp...
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New energy electric/hybrid vehicle driving motor development trend

01. Development trend of new energy vehicle driving motor type 1.1 ac induction motor At present, a variety of pure electric and hybrid new energy vehicles on the market, permanent magnet synchronous motor accounted for the majority, induction motor accounted for a small part, these two kinds of motor is basically all the electric passenger car drive motor. Compared with permanent magnet synchronous motor, ac induction motor is larger, but the price is moderate, and the induction motor can do a lot of power and there is no demagnetization problem. 1.2 permanent magnet synchronous motor For small and medium-sized electric vehicles with high requirements on space layout size, permanent magnet synchronous motor with higher power and torque density is the preferred choice. Moreover, synchronous motor is more suitable for frequent start and stop conditions and suitable for the application scenarios of urban commuting. This is one of the reasons for Tesla Model 3 to use synchronou...
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