| 摘要 |
PURPOSE:To perform the estimation of temperature by obtaining a first order lag temperature characteristic by a winding current value and then by further obtaining the first order lag characteristic by the variations of the winding current value in addition to the said temperature characteristic. CONSTITUTION:Thermal input and temperature output response will be in the first order lag system. Firstly, in the range of time O<=t<a if the motor current I1 is caused to flow, the temperature rise characteristic of a motor winding temperature thetau1 will be obtained. If the motor current is changed to I2 in the range of time a<t<=b, the motor winding temperature thetaD1 will show the falling characteristic of the first order lag in the current difference (I1-I2). Furthermore, when the rising characteristic by the current I2 after the current change is added and overlapped, the temperature falling characteristic is obtained. Moreover, if the motor current I3 is caused to flow in the range of time b<t, the motor winding temperature thetau2 will show the rising characteristic of the first order lag in the current difference I2-I3, which is added and overlapped by the rising characteristic by the current I2 and becomes the temperature rising characteristic. |
