Tripmode config driver#
Tripmode config full#

The higher, the more d-current is brought in for additional reluctance torque So when you set a value of 0.35 you might end up with 0.33.Īmplitude limiting field weakening controller proportional gainĪmplitude limiting field weakening controller integral gainĭistance to maximum output amplitude (37500 digits) when field weakening is brought inĭifference between d and q axis inductance. That means there are 32 possible values after the decimal point. Parameters are internally stored with 5 binary fraction digits. The following parameters currently exist to customize the controller software. Setting the deadtime too low while operating of a potent power source can blow up your power stage! Make sure to test the deadtime at low power levels. More values can be found in the STM32 data sheet. When configured inversely it will blow up your power stage immediatly if connected to a potent power source like batteries.ĭeadtime The time between switching off one IGBT and switching on the other. Do not touch this parameter if you don't know what you're doing. Pwmpol Sets the polarity of the PWM signals, active high or active low.

Tripmode config driver#

The maximum frequency is also limited by the driver boards as explained here. The faster the switching the higher the losses in the inverter and the lower the losses in the motor. Pwmfrq Sets the frequency at which the IGBTs are switched on and off. At very low amplitudes the motor does not generate any noticable torque and throttle travel is wasted that does nothing. The default 200Hz would result in a maximum speed of about 6000rpm.Īmpmin Is the minimum relative amplitude fed to the motor. If set too high the motor will start to rock violently on startup, possibly tripping the over current limit.įmax is used to limit the speed of the motor. So its best found experimental starting with 2*fslipmin. 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.

Tripmode config full#

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.