EV Technical Academy Archives - Foshan Green Electric Vehicle Technology Co., Ltd.

Analysis of Causes for Compressor Failure to Operate

The compressor is a core component of air‑conditioners, refrigerators, cold storage units, air compressors and other equipment. Once it stops working, the entire system loses its cooling, compression or air‑supply capacity. Compressor non‑operation can stem from many factors, including power‑supply and control‑circuit faults, activation of protective devices, motor defects, mechanical seizure or a...

72V 400A Controller Burning MOSFETs: Can Replacing the Aluminum‑Base Circuit Board Fix It? An In‑Depth Review of a Real‑World Repair Case

I. Case Background: A Power System of "Small Horse Pulling a Heavy Load" I recently took in an electric vehicle controller for repair with the following specifications: Controller: 72V, 400A (peak) Motor: 7.5 kW rated, 15 kW peak, peak torque 110 N·m Gear ratio: 10.5 : 1 Tire radius: 355 mm Gross vehicle weight: 2000 kg Designed vehicle speed: 40 km/h Customer complaint: Th...

Who Manufactures Club Car Battery Chargers? OEM, Replacement, and China Manufacturers Explained

So you're trying to figure out who actually makes Club Car battery chargers. Maybe you need a replacement for your Precedent. Maybe you're a dealer looking for a reliable aftermarket source. Or maybe you're sourcing for a fleet and wondering if there's a China manufacturer that can supply compatible chargers at a better price. Here's the thing: the answer isn't as simple as "Club Car makes them....

How to Size Motor Controllers

Low-Voltage AC, Low-Voltage PMSM, and High-Voltage PMSM If you've ever spec'd a motor controller by just matching the kW rating—like picking a 15 kW drive for a 15 kW motor—congratulations, you've done exactly what gets field engineers called back to the site on weekends. Here's the thing: a motor controller isn't a USB charger. It's an inverter + control algorithm + protection system rolled...

Field Weakening on PMSM: Why Your Golf Cart Can’t Climb Hills When the Battery Is Low

If you've ever designed a controller for a low-speed EV—golf cart, resort shuttle, warehouse tugger—you've probably seen this complaint: "Full charge, it climbs fine. After 20 minutes, it just gives up on the same hill." The motor isn't broken. The controller isn't lying. It's field weakening, and more specifically, the lack of voltage headroom to do it properly. This post explains what f...

How Your Golf Cart Knows When to Stop: The “Brain” Behind Electromagnetic vs. Electronic Parking Brakes

If you've read my last post, you already know that not all golf cart parking brakes are created equal. But today I want to zoom in on two of the more modern systems we build into our vehicles: electromagnetic parking (found on models like the GD043, GS023, G1A, and G1P) and electronic caliper parking (the star of the MORK). To the eye, both look similar. There's no hand lever. No foot pedal. ...

Engineering the “Stay-Put”: A Technical Comparison of Low Speed Vehicle Parking Brake Systems

For those of us in the low-speed electric vehicle (LSEV) industry, there's a recurring theme during vehicle commissioning and customer handover: the parking brake. While top speed and range dominate spec sheets, the parking system is the single most frequent point of contact between the user and the vehicle's core safety architecture. It dictates not only safety but also ergonomics, NVH (Noise, Vi...

Troubleshooting electric drive failure and non-driving failure

When the electric drive system fault pops up on the electric vehicle instrument, the vehicle is directly prohibited from driving. Many faults belong to intermittent recessive faults, which are easier to trigger in bumpy road, rapid deceleration and alternating cold and hot environments. The static reading of fault codes in situ may not be able to reproduce. Combining with a large number of afte...

DCDC failure analysis

When many engineers encounter DC/DC fault alarm, the first reaction is to directly replace the DC/DC body or all-in-one assembly (all-in-one includes integration with OBC, PDU or MCU, etc.), and the owner is also easily advised to directly replace the parts. Comparing with the FTA fault tree of DC/DC faults, many faults are not rooted in the DC/DC itself, and blind replacement will only increas...

Troubleshooting intermittent CAN communication failure

Many engineers encounter this kind of problem: the charging function fails after the vehicle is powered on, the CAN communication fault of the charging system is diagnosed, and the fault code is repeatedly cleared, but it still fails to charge normally. Many people directly judge that the charger is damaged and replaced blindly, resulting in unnecessary waste. Combining with the fault tree, we can...