fslipmax can be set as high as breakdown torque which is not found on the nameplate. fslipmin is set to the motors optimal slip frequency which can be deduced from the nameplate. fweak can be configured lower than that resulting in more torque at the low end.įslipmin/ fslipmax is the slip frequency at which the motor is run at minimum/maximum throttle. With our illustration motor fweak=(355 V/230 V) * 50 Hz = 77 Hz. Beyond fweak torque will decrease to the square of frequency and thus power will decrease linear with frequency.Ī starting point for fweak is the motors nameplate: It is also the point of the highest motor power. Start with the default value and increase until you get a good startup.įweak is the frequency at which the full possible voltage is generated. The best way to find a feasible value is to optimize it in the finished car. 0 means no voltage is generated at all, 37813 means the full possible voltage is generated.Īt full throttle an effective voltage of 1700/37813*355=16V is generated. Digital amplitude is an internal quantity. It is needed to overcome the motors ohmic resistance. With 500V DC an AC voltage of 500/1.41=355V can be generated.īoost is the digital amplitude of the sine wave at motor startup. For illustration we will assume a bus voltage of 500V and a 4-pole (p=2) motor with a nominal speed of and 230V. They can be deduced from the motors nameplate or by trying which feels best. The parameters to adjust the inverter to the motor are boost, fweak, fslipmin, fslipmax, polepairs, fmin, fmax and numimp.
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