Making a decision to convert a vehicle to electric traction or replace a failed vehicle electric motor In an existing electric car requires a deep understanding of technical nuances. The market of components is now full of offers, but to find a really reliable unit that will provide the stated dynamics and will not burn out in a week is not an easy task. Many enthusiasts are faced with the problem of discrepancy of the declared characteristics to real indicators, which leads to additional costs and loss of time.
Before ordering and buy an electric motor for a carIt is necessary to clearly define the objectives of modernization or replacement parameters. It is not just about finding a part by catalog number, but about a complex engineering calculation, which takes into account the weight of the body, aerodynamics and the desired maximum speed. An error in choosing the type of motor can make the vehicle inefficient or even dangerous.
In this article, we will discuss in detail all aspects of the choice of power plant, starting from the classification of engine types and ending with the nuances of their physical installation. You will learn which options to look at first, how not to fall victim to unscrupulous sellers and what tools will be required for installation.
Types of electric motors: what to choose for conversion
The basis of any electric vehicle is the traction engine, and its type depends on 80% of the success of the entire project. At the moment, for the conversion of cars, three main categories of units are most often considered, each of which has its own unique advantages and disadvantages. The choice between them is dictated by the budget, the presence of space in the engine compartment and the required torque characteristics.
The most popular solution for self-conversion collector DC. Their main advantage is the ease of control: they do not require a complex inverter, a sufficiently powerful controller that regulates the voltage. However, such motors have a significant disadvantage - the presence of graphite brushes, which wear out over time and require replacement, which reduces the overall resource of the unit.
- ⚡ Collector DPTs: They are cheap to buy, easy to manage, but require brush maintenance and have limited resource.
- 🌀 Asynchronous (AC Induction): They are reliable, have no brushes, can withstand high overloads, but require an expensive and complex controller.
- 🧲 Permanent Magnet Engines (PMSM/BLDC) They have the highest efficiency and power density, compact, but very expensive and sensitive to overheating magnets.
If you are planning to create a high-performance car with a power reserve of more than 200 kilometers, you should pay attention to the following: motors Or aggregates on neodymium magnets. They are more efficient at converting battery energy into motion, although they require a more sophisticated cooling and control system. For light urban electric vehicles or ATVs, a high-quality collector solution is often enough.
Key technical characteristics when buying
Once the type of motor is determined, it is time to study the specifications in detail. Beginners often make the mistake of looking only at the rated power in kilowatts, forgetting that low-revving torque is critical for a car. It is this parameter that determines how quickly the car will start from a traffic light and whether it will be able to confidently overcome the climbs.
The second critical parameter is nominal voltage and maximum current. These numbers directly depend on what battery assembly you will have to create. If the engine is designed for 96 volts, and you assemble a battery of 72 volts, you will not be able to unlock its potential, and if the voltage is exceeded, you risk breaking through the winding. It is also important to consider nominal and maximum revolutions per minute (RPM).
⚠️ Attention: Never choose the engine solely for peak power. Short-term overload 2-3 times higher than the nominal value is permissible only for 30-60 seconds. Prolonged work at peak values will lead to heat discharge and irreversible damage to the insulation of the windings.
Equally important is the insulation class and the degree of protection against dust and moisture, denoted by the IP marking. For automotive applications, the minimum standard is IP54However, to install directly into the transmission or under the bottom, it is better to look for options with IP65 and higher. The engine will be subject to vibrations, temperature changes and reagents, so the tightness of the body is a matter of durability.
When choosing a motor, be sure to check the presence of rotor position sensors (encoders). Without them, modern controllers will not be able to correctly control the AC motor, and the system simply will not start.
Where to buy: Market and supplier analysis
The question of where to buy an electric motor has many answers, but each channel of sales carries its own risks. Large dedicated EV component stores offer warranty and technical support, but their prices can be 30-40% higher than market prices. Chinese sites provide a wide range and low prices, but the logistics of overall cargo and the risk of obtaining defective products fall entirely on the shoulders of the buyer.
A separate category is the secondary market and disassembly of emergency electric cars. You can find the original engines from here. Tesla, Nissan or Renault at a price several times lower than the new unit. This is an excellent option for those who have diagnostic skills, since the condition of the bearings and the insulation of the windings of such units is often unknown. Buying a used motor is always a lottery, requiring verification by a megohmmeter.
When ordering from abroad, be sure to take into account the weight of the package. A heavy-duty engine with cast iron body can weigh more than 50-70 kg, which will significantly increase the cost of delivery. In addition, lithium batteries for tests (if included) may be prohibited from being shipped by air.
Hidden costs when buying a motor
In addition to the cost of the engine itself, budget the costs of an adapter plate (advancer between the engine and the gearbox), a shaft coupling and reinforced cushions. These parts are often not included and are made individually for the model of the car.
Comparison of popular models for conversion
To make it easier to navigate the sea of offerings, we have compiled a comparative table of popular engines that are often chosen for the conversion of small and medium-sized cars. These parameters are averaged for standard modifications.
| Engine model | Type | Nominal power | Max. tension | Features |
|---|---|---|---|---|
| DC Motor HPEVS AC-23 | asynchronous | 23 kW | 144-160 V | High torque, liquid cooling |
| NetGain Hyper 9 | DPT (Serial) | 26 kW | 156 V | Legendary reliability, air cooling, large size |
| HPEVS AC-50 | asynchronous | 50 kW | 320-380 | For heavy cars, compact body, high efficiency |
| ME1606 / ME1607 | DPT | 10-15 kW | 48-96 | Budget option for light cars and motorcycles |
When choosing between models, pay attention to the compatibility of shafts. Standards may vary: in some cases, you will need to order lathe work to flow the shaft under the slats of your gearbox. Standard shaft You may not be able to reach your current clutch or transition clutch.
Instructions for installation
After you've decided Buy an electric motor for the car, the preparation stage begins. Installation of an electric motor is radically different from installation of an internal combustion engine. There is no vibration from the fuel explosions, but there is a high torque from the first revolutions, which creates huge loads on the fasteners and transmission.
The first step is always to make or buy an adapter plate. It's a metal plate that connects the flange of the engine to the gearbox crankcase. The precision of manufacturing this part should be at the micron level to avoid beating the shafts and breaking the bearings. Independent milling without CNC machine is highly recommended.
☑️ Checklist before installing the motor
It is also important to provide a system for attaching the engine itself to the body or subframe. Electric motors often have a different mounting geometry than gasoline units. The use of welded brackets is permissible only in the presence of experience, since metals must withstand dynamic loads during acceleration and braking.
⚠️ Attention: Before the first connection, be sure to check the direction of rotation of the shaft. Incorrect phase connection (in the case of AC motors) can lead to a rotation in the opposite direction, which instantly destroys the mechanical part of the transmission when trying to move.
Frequent errors and final recommendations
The process of electrifying a car is full of pitfalls. One of the most common mistakes is underestimating the cooling system. Even if the engine has air cooling, in the enclosed space of the engine compartment it quickly overheats. It is necessary to organize a forced air blowing or, ideally, connect the circuit. liquid-cooling.
It is also often forgotten about the coordination of the controller and the engine. Buying a powerful motor and a weak controller will result in you not being able to tap into the potential of the engine. On the contrary, a weak motor with a powerful controller will burn up at the first attempt of a sharp acceleration, since the “smart” electronics will allow current to be supplied above the nominal value.
In conclusion, buying an electric motor is just the beginning of the journey. The success of the project depends on an integrated approach: proper calculation of power consumption, high-quality assembly of the high-voltage battery and competent configuration of the controller software. Do not skimp on diagnosing components before assembly.
The main secret of success is not to chase the maximum power, but to ensure a reliable thermal regime and proper docking of the engine with the transmission. Reliability is more important than dynamic records.
Can I use the engine from the washing machine for the car?
Theoretically, it is possible, but it is practically a bad idea for a full-fledged car. Engines from washing machines have too little power (usually up to 1 kW) and low revs. They are suitable only for lightweight electric bikes or children's ATVs. For acceleration of the car weighing 1 ton of their torque is not enough.
What is the life of an electric motor in a car?
With proper operation and the absence of overheating, the life of the electric motor ranges from 50,000 to 100,000 km or more. In asynchronous motors, only bearings are worn out, which are easy to replace. Collector motors require brush replacement every 10,000 to 20,000 km depending on driving style.
Do I need to register the replacement of the ICE on the electric motor in the traffic police?
Yes, the replacement of the engine type (from the internal combustion engine to the electric one) is considered to be a change in the design of the vehicle. This is a complex legal procedure that requires preliminary examination, approval in the laboratory and subsequent registration of changes in documents. Riding without registration threatens with a fine and deregistration.