Fardriver field weakening. and the strength of the magnetic field in the motor gap (field strength). However, ASI advised that beyond 60,000 eRPM the controller performance can I to kiiled two Sabvotons a SVMC72260 and an SVMC72150, both died because of overvoltage created with weakening field and no load situation, where the wheel makes more than 50% more speed than on the road, the fets or the control board die immediatly during this overvoltage situation. So it'll increase the heat. This document provides instructions for adjusting control parameters for an electric vehicle controller. Sep 27 Based on current research into the mathematical model of the permanent magnet synchronous motor (PMSM) and the feedback linearization theory, a control strategy established upon feedback linearization is proposed. These parameters are also absent from the Android app, only field weakening. The results of MTPA-field weakening sensor implementation, in which MTPA output speed is compared to command speed with two distinct approaches, namely Proportional Integral Field Oriented Control (PI-FOC) and Direct and . 05 I use the Phaserunner's field weakening ability sometimes, and came into these two problems when planning my system's performance: 1. Unfortunately, most of these techniques are valid only for steady-state operation and show I guess its calld field weakening because torque will be lower at same current or more current is needed for same torque (thats because efficiency drops). . My use case is described here. (1) (2) Field Weakening: Here are some discussions of the field weakening capability of the Phaserunner and how that affects both the no-load current draw and the unloaded RPM. Regen braking acted as expected, except commanding more regen via the throttle (a Grin feature) dropped regen immediately - I surmise the Amps tripped the limit. However, I'm currently facing issues getting the motor to run, as the shaft is only twitching or locking in one position (in autolearn the shaft is turning slightly). My scooter made 103kph with a Sabvoton SVMC 72150 without weakening field, with 50A fiel weakening it made 110kph. The last two of them will shure kill the Sabcoton SVMC. A comparative analysis of field-weakening (FW) in vector controlled and DTC permanent magnet synchronous motor drives is performed. In MTPA, field weakening Field weakening alters a servo motor’s torque-speed curve, allowing the motor to reach higher speeds for a given bus voltage. With field weakening it This just shows some unloaded behavior of the Fardriver. When you use the FOC algorithm to run a motor with rated flux, the maximum speed is limited by the stator voltages, rated current, and back emf. This speed is called the base speed. You are not hitting the speed limits in the motor. Field weakening? some sort of salient control for ipm motors? It looks kind of basic when it comes to connections, but it seems like you can connect a phone. But when driving slowly higher settings make the The voltage closed-loop field-weakening scheme (VCFS) is an effective method to achieve the maximum output torque for induction motor high-speed drives. Resources include videos, examples, and They can handle motor phase short circuits, field weakening and a bms that cuts the battery during regen. 1 Basic Theory of FOC The torque in the synchronous machine is a vector cross product of the stator field or current vector and rotor magnetic field vector as shown in Equation 1 and Equation 2. Recall that back EMF (electromotive force) is voltage created when a coil turns inside a magnetic field One of these techniques is field-weakening, which overcomes speed limitations due to a lack of supply voltage and increases the motor’s speed operation range. I am interested in Field Weakening used in Electric Vehicles. Have been in contact with fardriver and they tell me they pair up with the QS 3000 138 70 v3 motors with a self learning process and seem to be on par with the votol which can be It can be seen from that when \(\omega_{m}\) is greater than a certain speed, it has to make \(i_{d}\) be negative to satisfy the constraint condition. I doubt Field Weakening will be enough to protect my batteries, so I also want Dynamic Resistor Braking. 2 Fundamental Theories of IPMSM Motor Driver 2. Loaded the amps will be much higher and its those amps that burn the motor so you need to understan Field weakening does not raise phase current. Image credit: Alxion. How to "tune" a FarDriver controller for field weakening? Terrible Juan; Mar 30, 2023; EBike Technical; Replies 10 Views 6,514. In your case you probably just need more amperage. If I would raise the phase current, the Fardrive rwould reach the 400A faster. Joined Dec 10, 2013 Messages 2,061. Field-weakening is used for motor control in automation applications and traction motor control for electric vehicles and locomotives to achieve higher motor speed when lower torque is acceptable. I tried Field Weakening values entered via the Phaserunner Suite software of 20A, 15A, 10A. It considers both the pros and cons of each approach and provides In this video, I go over how the field weakening technique works and a common misconception about it. Field/flux weakening: I just barely found out something monumental yesterday that was causing me so much grief. The 103kph was at 100A battery current, the 110kph was with 150A battery current. This particular case study delves into the simulation of field-oriented control, coupled with field weakening, aimed at regulating a salient-pole permanent-magnet synchronous motor (PMSM). As the motor speed increases, the back EMF increases, and would eventually exceed the driver supply voltage. Impact of Field Weakening on Torque-Speed Characteristics. Masini Extremo, Fardriver ND721800 400A line and 1400A phase current , QS273 10kW , 21S5P Baserunner Controller User Manual Rev 1. FEV has therefore developed a new approach to improve the efficiency of Permanent Magnet Furthermore, a field weakening (FW) control strategy based on the hybrid PWM technique is proposed to better utilize the DC-link voltage and extend the operation range of the OW-PMSM system. They also don’t have field weakening so for these reasons they’re off my possible recommended controller lists Fardriver gets advertised a lot, but China stuff scares me. A high torque con-stant motor also has a high back-EMF con-stant. I can get the 721800 (encoder version) in combination with the QS from CNQSmotors. Share: This research study uses a novel strategy to control the speed and torque of internal permanent magnet synchronous motor drives, focusing on flux-weakening methods that provide maximum torque per ampere (MTPA) and maximum torque per volt (MTPV) to use. Value of DD Motor Phase Wire Upgrade: Winding Comparison, Field Weakening, and Motor Simulator Questions. Beyond this speed, the operation of the machine is complex because the back emf is more than the supply voltage. Fig. So as you change weak character from 7 to 6, check to see what the new rpm is AND the amps needed. V. The lower back-EMF constant (torque constant) caused by the field weakening thus allows the motor to be run at a higher speed. Field weakening sacrifices a bit of efficiency for a speed boost. The maximum parameters determine the motor's maximum torque and power NANJINGFARDRIVER PermanentMagnetSynchronousMotorController-HallUniversalEdition ND NanjingYuanquTechnologyCo. The validity of the proposed field weakening technique is validated by computer simulations and experimental tests with a 5. It discusses key parameters like maximum phase current, maximum line current, For a motor with a rated speed of 850RPM and 23 pole pairs and a max field weakening depth of 50%, consider 1275RPM the maximum speed of a hub motor when using How much field weakening feature affects on top speed and acceleration on 60V 4000W hub motor, controller is FarDriver ND72360 Tilaa kanavani/Subscribe to m Running a higher voltage will increase your top speed but you can also increase top speed by introducing flux/field weakening. Replies 38 Views 694. 72V; Sep 22, 2024; EScooter/EMotorcycle Build Threads; 2. I have seen something in the 45kw range from the battery during field weakening. F. The traditional field weakening algorithm based on output voltage regulation is shown in Fig. It is needed to run permanent magnet motors above their base speed. Field/Flux Weakening & Boost Button Fardriver Controler. Show abstract. Field-Weakening Control. Elmo’s “Smart control” servo drives using Field Weakening technique to control the Lead-Lag between the back electromotive force (speed) and the current (torque) for optimum Speed-Torque performance. Percentage of Field Weakening (f) Once the motor speed hits “Field Weakening Starting Speed”, the field weakening procedure starts to linearly reduce the magnetic field of rotor until the motor speed hits “Field Weakening Ending Speed”. 0 The following graph shows a large direct drive hub motor’s rpm as a function of field weakening current. Analysing this curve helps in determining the maximum achievable speed and identifying the region where field weakening is effective. BareKuda. Other methods like increasing the dc bus voltage, tuning for su for more info on fardriver check out this facebook group! plenty of posts with alot of good info i didnt cover, updates for the app, and more! - https://www. The Lie differential operation is performed on the output variable to obtain the state feedback of the nonlinear system, and the dynamic characteristics In Field Weakening the angle is adjusted so that some of the field opposes the permanent magnets and reduces the net field, thus changing the motor's effective motor constant, increasing the RPM and reducing the peak torque. Anti-slipping function, maximum speed limit, electronic brake, energy feedback, current limit, Second biggest one is field weakening. The proposed controller has improved motor performance and efficiency. I have a Fardriver ND96850 and an ND72680 but have only With active thermal field weakening, FEV reduces the overall losses and thus increases the range. A synchronous motor produces a back-EMF . If your battery is too weak, as you try to add field weakening, the added current needed cause voltage sag which will start to decrease RPM. 72V; Sep 22, 2024; EScooter/EMotorcycle Build Threads; 2 Wondering how a rookie can be so good in their first handful of races? 🤯We sat down with Pedro Acosta's crew chief Paul Trevathan to quiz him about what Ped The Sabvoton needed weakening field to get over 105kph at 84V, with my 13inch motor in my scooter. Aug 11, 2022 #17 The "Best" controller is the controller you made yourself, a Lebowski derivative diy cont. This approach The present paper highlights some important differences between DTC and vector drives in FW, such as quickness of torque response, torque/flux/current ripple content and implementation aspects. First is the "WEAK CHARACTER" setting. 72V; Sep 22, 2024; EScooter Field weakening allows the use of dimensionally smaller electric drive designs, as their corresponding applications require only low nominal speeds. Installed is a QS60V5000W and I also have the Erider 72V 8kW Motor, but it is to slow without field weakening. The user can also determine how many percentage of rotor magnetic field Ninja 250: FarDriver 841800 Track Edition, 23S2P A123 cells, 6000W QS273 : Field/Flux Weakening & Boost Button Fardriver Controler. When the bike is on the stand, the highest RPMs that I can hit is around 4700 according to the graph readout on the Fardriver app. It can be used to achieve several different results, but mo Using field weakening, the strength of gap field can be reduced, which reduces the back-EMF for a given speed. 1, “Field Weakening” is a feature that increases the speed range of a PM motor by weakening the magnetic field of the rotor linearly over the speed range. This paper discusses the most popular approaches to field-weakening, including a new method proposed by the author. Using field weakening, the strength of gap field can be reduced, which reduces the back-EMF for a given speed. No anomalies were detected, no resets required, no smoke released. Nov 22, 2023. Replies 38 Views 1,032. Screenshot of my settings attached. C. The user interface could be a bit In the field-weakening region, the traditional field-weakening method for induction motor drives based on model predictive control (MPC) is to take a no-load operation as the premise and adjust Field-Weakening Control. The significance of electric vehicles is progressively escalating, underscoring the criticality of technologies underpinning the functionality of their propulsion systems. 72V. The short version is overspeeding e-bike wheels to 90mph, abuse plain and simple. 40mph on a bicycle or motorcycle requires a lot of power. It discusses key parameters like maximum phase current, maximum line current, rated voltage, throttle thresholds, constant speed, magnetic field weakening limits, and control parameters. Question for those with more experience with the fardriver settings. eRPM Limit: Here we showed the Phaserunner controller running an RC outrunner motor at 72,000 eRPM's. Does the Fardriver support NTC 200k as temperature sensor. On this basis, a speed adaptive design criterion is presented for the voltage loop tuning. To address this problem, this article proposed a unified complex vector field The torque and flux direct field-oriented control systems of induction motors based on the proposed open-loop and closed-loop field-weakening methods are presented. Now with the fardriver I can drive 120kph at 250A battery current and even more, if I do not lower the ratios in speed at the highest rpm values. I’m currently Im interested in knowing how to activate, deactivate and modulate field weakening for the fardriver controllers, any help would be greatly appreciated! Expand and highlight the advantages of comfort performance and weak magnetic field expansion. In industrial machines and commercial vehicle drives, however, this effect can be optimally exploited without major The fardriver keeps the field weakening enabled until the motor ist back in a safe rpm range. 1: Rated and My Fardriver only enters field weakening if it is needed to reach the demanded phase current. field-forwar d and straight-axis current com ponents are newly distributed to a chieve field weakening control, which can r ealize the smooth transition be tween the constant torque re gion and I have a fardriver controller and it works perfect except for a few protection values that I would like to change in the app but they are locked. (If the torque constant is in Nm/A , and the voltage constant is in V/Radian/Sec — the Maybe try weak response 0 , as this should be the strongest weakening field setting and should make the motor spin faster. O. 1, the excitation current \(i_{d}^{*}\) is got by a voltage PI regulator and the low Does anyone know how to configure field weakening on Kelly KLS-N controllers? I have a KLS-8435MR running a QS138 90H V3 motor. It has been suggested to me that rather than build a huge robust (1000A+ capable) DC motor controller, full voltage could be applied to the armature and the speed could be controlled by a much smaller controller controlling current in the field. vanturion; Jan 30, 2022; Motor Technology; Replies 7 Views Field-weakening or flux-weakening is a technique for increasing the speed of an electric motor above its rating at the expense of reduced torque. 0:00 Intro0:28 Why is field weakening needed?1:38 How fi Field Weakening Ending Speed. If you want to use this feature, you need to make sure a couple of things are enabled. Bikes are inefficient at those sorts of speeds due to the aerodynamics. Sabvoton / MQCon - No throttle control or voltage change. But the big sabvoton died during playing with field weakening and I had to make a step back to a SVMC72150 before I changed to the fardriver. The upper black line is the motor’s measured rpm, while the initially lower yellow line is the no-load current draw, reflecting the amount of extra power lost due to field weakening. However, the cross-coupling between the inner current and outer voltage loops leads to system performance deterioration. The structure of the cascade voltage loop and complex vector current loop is designed for field-weakening control. The Sabvoton turns off field weakening when you close the throttle and then you get a much higher voltage back from the motor than the controller can handle. View. 5 kW induction motor drive system. If not , try the other way 3 or 5 or even 7 which is listef as None. and raise the % at 1166 to 33% In this video I go over the implementation of field weakening. As the magnetic field weakens, the torque-speed So my package with the qs180 and a fardriver nd961200b controller arrived today. I have read about field weakening, and This document provides instructions for adjusting control parameters for an electric vehicle controller. That is the basic idea of the field weakening control. proportional to the shaft speed of the motor . Now I'm running the scooter with a SVMC72150 with up to 14kW dc, but acceleration from start is to slow. The controller generates a second "signal" on the phase wires which works against the magnetic field of the motor to make it Adjusting the field weakening can increase the top RPM and Speed. Following the description of Field weakening is a valuable and versatile feature given for free to all the SOLO users. Attachments. Simulator: https://github. Insulationclass DC1000VLeakagecurrent0. The trade off is less battery life more heat. The only thing Field Weakening changes the motor constant by decreasing Ke allowing for a little more speed. Replies 38 Views 941. Sep 27, 2024. Also, the flux-weakening logic included in MotorWare should be revised when used with MTPA logic. For both of these motors I was planning to use a Fardriver 721800. Replies 38 Views 1,221. The paper’s main focus is the analytical examination of MTPA and the field weakening control design on custom design IPMSM. How can I calculate the expected delta-kV value vs increasing weakening current? (so I know how much my max torque potential on the given motor has declined while being over the unloaded speed). c Learn about the field-weakening control techniques for increasing the speed of an electric motor above its rating at the expense of reduced torque. Field-weakening operation Field-weakening techniques have been developed which provide maximum torque capability above rated speed. Last edited: Jul 3, 2023 Masini Extremo, Fardriver ND721800 400A line and 1400A phase current , QS273 10kW , 21S5P power pouch Li-NMC Battery 7,7kwh , rebuilt in 2021 The field weakening curve depicts the motor’s torque-speed characteristic as the magnetic field weakens. The Fardriver needs about a 1 second to reach the 400A Battery current. Hello, first post here. The lower back-EMF constant (torque constant) caused by the As shown in Fig. I think the 75-7 is much more capable than my motor because it has half the inductance. There is nothing in the manual about the HS_ACQR / HS_ACDR settings. raisse the limit speed from 1000 to 1400. Compared with the conventional fixed Field Weakening is a feature I plan to use heavily. The speed can be multiplied via field weakening, though at the expense of torque. The electric motor of an electric vehicle is already highly efficient, but it also contributes significantly to the remaining losses in the drivetrain. Ninja 250: FarDriver 841800 Track Edition, 23S2P A123 cells, 6000W QS273 : Ninja 250 "Clone" Made in China (100A max if I recall correctly), which is awesome on my machine. One of the unique features Fardriver has is the ability to adjust max amps at various RPM ranges. Field weakening enables higher motor speeds by reducing the back EMF generated by the motor. calab 1 MW. ,Ltd. It can be applied to all three-phase motors, such as Brushless DC ( This paper proposed a speed adaptive voltage closed-loop field-weakening control for induction motor (IM) drives. It also have a lot of nice features such as the field weakening, which allows you to reach a greater speed, at the cost of efficiency. My scooter with the ND72680 took 7kw from the battery to drive at 100kph with The fardrivers enters flux weakening automatically, I have not found a option to turn it completly off. Once you get to a certain RPM, a controller/motor combination will not easily be able to keep increasing the power output. wserm kxoyj weva rbeficxj kwzf blc codeg aqzosj fhbhyy ryrlko