Fast detection device and method of thermal stability sintered neodymium iron boron material for electric machine
A thermal stability and detection device technology, which is applied in the direction of motor generator testing, etc., can solve the problem that block-by-block detection cannot be done.
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Embodiment 1
[0034] Embodiment 1. In the above detection device, simulate the actual working condition of the maximum possible demagnetization of the permanent magnet at the highest working temperature of the motor, so as to check whether the permanent magnet has irreversible demagnetization under this working condition, that is, demagnetization.
[0035] The specific implementation steps are:
[0036] (1) Put the permanent magnet in the rapid detection device and heat it up to the maximum working temperature allowed by the motor. For example, the maximum working temperature of the SH series permanent magnet is set at 120°C;
[0037] (2) Through the dial, input the current value converted according to the actual current of the motor to the single-chip microcomputer, and the single-chip microcomputer compares the above-mentioned current value obtained with the current value actually measured by the permanent magnet and converted by A / D, and determines according to the comparison result The ...
Embodiment 2
[0048] Embodiment 2, the method of actually measuring the magnetic flux is designed according to the change of the magnetic flux during the measurement process, the value sampled back in the measurement process is the magnetic flux value, and the magnitude of the applied current is determined according to the magnitude of the magnetic flux.
[0049] (1) Put the permanent magnet in the rapid detection device and heat it up to the maximum working temperature allowed by the motor;
[0050] (2) According to the magnetic flux value through the dial Calculate the correction coefficient of the magnetic flux value φ with the change of the demagnetization current, and input it to the single-chip microcomputer. The single-chip microcomputer compares the above-mentioned value obtained with the actual measurement of the permanent magnet and the current value converted by A / D, and determines the value of the applied current according to the comparison result. Size, in order to control the...
Embodiment 3
[0066] Embodiment 3 is actually a process of calculating according to the magnetic parameters of the permanent magnets using different calculation formulas. Let room temperature t 0 When the remanence is B r0 (unit kGs) coercive force is H c0 (unit kOe), intrinsic coercive force is H CJ0 (unit kOe), the critical field strength is H K0 (unit kOe).
[0067] The corresponding parameter at the working temperature t is B rt 、H ct 、H cJt 、H kt . α(B r ) and α(H c1 ) takes the absolute value, and is abbreviated as α B and alpha H . The meaning of each parameter is attached figure 1 shown. Assuming that during the temperature change, μ r = B r 0 H c 0 constant, Q = H K 0 ...
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