Determination and Application of Maximum Efficiency Curve of Crawler Electric Tractor Motors

Table 1

Powertrain specification parameters.

Item	Parameter	Value
Overall vehicle parameters	Overall weight (kg)	1100
	Track ground length (m)	1.675
	Track path (m)	1.175
	Equivalent wheel radius (m)	0.2
Battery system	Battery type (model)	Lithium iron phosphate battery (CA180FI)
	Nominal cell voltage (V)	3.2
	Nominal cell capacity (Ah)	180 (0.3 C, discharging)
	Battery pack configuration	One in parallel and 30 in series
	Rated output voltage of battery pack (V)	96
	Operating voltage range of battery pack (V)	84–109.5
Motor drive system	Motor type (model)	Disc brushless DC motor (PWZD7.5A3)
	Rated (maximum) power (kW)	7.5 (15)
	Rated voltage (V)	96
	Rated (maximum) torque (Nm)	29.8 (65)
	Motor controller	Hefei New Generation EVC401-085P
Gearbox	Overall transmission ratio on I/II/III gear	76.576/42.366/23.398
Power output	Power takeoff on low/high gear	4.458/2.273