Motor temperature segmented switching sampling circuit and temperature calculation method

Abstract

The invention discloses a motor temperature segmented switching sampling circuit and a temperature calculation method. The circuit comprises a temperature sampling resistor, three capacitors, seven resistors and a triode. A first resistor is connected with the first end of the temperature sampling resistor and the first end of a first capacitor; the second end of the temperature sampling resistoris connected with the second end of the first capacitor, the first end of a second capacitor, the first end of a second resistor and the first end of a third resistor; the second end of the second capacitor is connected with the second end of the second resistor, the first end of a fourth resistor and a collector of a triode; the second end of the third resistor is connected with the first end andthe sampling end of the third capacitor, a base electrode of the triode is connected with the first end of a sixth resistor and the first end of a seventh resistor. An emitting electrode of the triode is connected with the second end of the fourth resistor and the second end of the seventh resistor, and the second end of the sixth resistor is connected with the first end and the control end of afifth resistor. According to the invention, stable switching of different temperature sections of a motor can be realized, and fluctuation of temperature calculation during switching is reduced.

Description

Technical field [0001] The invention belongs to the technical field of electric vehicle electric drive system control, and specifically relates to a motor temperature segment switching sampling circuit and a temperature calculation method. Background technique [0002] As an important part of electric vehicles, the electric drive system is the key to realize the mutual conversion of mechanical energy and electric energy. The electric drive system mainly includes the motor controller and the motor body. The motor will generate a lot of heat due to the copper loss and iron loss during the working process, so the temperature of the motor must be sampled and monitored to avoid unexpected high temperatures. The harm. At present, in order to achieve high-precision motor temperature sampling in a wide temperature range, the usual solution is to switch the temperature sampling circuit through switches in different temperature sections. However, due to the transition process of the moto...

AI Technical Summary

Problems solved by technology

However, since the temperature sampling voltage of the motor has a transition process during the switching process, it is very necessary to realize the smooth switching of different temperature segments of the motor through the algorithm and avoid the fluctuation of temperature calculation during switching.

The current motor temperature calculation method is mainly suitable for working conditions other than the switching process, and cannot solve the problem of fluctuations in temperature calculation and frequent switching of switching circuits caused by fluctuations

Images