Why a Single Speed Gearbox is Perfect for All Light-Duty Electric Cars and Trucks
- Mar 4, 2020
- 2 min read
Updated: Jul 7, 2024
Torque from the motor goes through and is compounded (multiplied) by the ev transmission or gearbox and differential gears, jointly referred to as “final drive ratio” or (FDR). Electric motors have a much broader torque band than do internal combustion engines, in fact, most make full torque right up from zero rpm. Electric motors do have a sweet spot where the efficiency is at its highest but in light-duty vehicles the torque is strong across the normal rpm range, here multiple speeds are unnecessary and would be a complete waste of money.
Midsize and large trucks (class 5 and above) find benefit from multiple speed transmissions but class 4 and below can be quite efficient and have amazing performance with a single speed gearbox.
Internal combustion engines (ICE) rely on rpm increase to get in the peak torque of the engine. Then through multiple speed gearboxes or automatic transmissions with torque converters try to keep the rpm high while accelerating. Without the multiple speeds close together their acceleration and efficiency would suffer greatly.
ICE example - Most ICE vehicles today have between six and ten forward ratios to create decent acceleration and also provide cruising economy by squeezing the maximum efficiency out of every gallon of fuel.
ELECTRIC example - Tesla cars have awesome acceleration and top speeds as high as 163 mph and they accomplish this with one forward ratio (no shifts). In fact, most all-electric light duty vehicles have only one forward ratio, simple is good. Some manufactures refer to not having a transmission at all but they do have a reduction gearbox sometimes called a reducer.
Having a high FDR allows the use of smaller more economical motors. Too much ratio, however, will limit the vehicle’s top speed, what is referred to as being gear bound. We suggest you choose your FDR to allow the desired vehicle top speed, then choose the motor size and pack voltage for the acceleration performance you desire.
Help with these calculations and decisions can be found by contacting us online or by calling our tech staff with your questions at 623-755-8214.
Mình có lần lướt đọc mấy trao đổi trên mạng thì thấy nhắc tớiشيخ روحاني nên cũng tò mò mở ra xem thử cho biết. Mình không tìm hiểu sâuرقم شيخ روحاني, chỉ xem qua trong thời gian ngắn để quan sát bố cụcرقم شيخ روحاني cách sắp xếp các mục và trình bày nội dung tổng thể. Cảm giác là các phần được trình bày khá gọn, các mục rõ ràng nên đọc lướt cũng không bị rối Xoilac2, với mình như vậy là đủ để nắm شيخ روحاني مضمون tin cơ bản rồi.
Many Indian students consider pursuing MBBS in Russia because of the availability of English-medium programs and relatively structured medical curricula. It’s important to review university recognition, clinical training opportunities, and licensing requirements carefully. I also came across some helpful general guidance while reading discussions on Education Vibes that explain the admission process and considerations for Indian applicants.
MBBS in USA is often considered a strong option for students looking for advanced medical education and global exposure. Since the US follows a different pathway with pre-med and MD programs, understanding the admission process and eligibility requirements is really important before applying. I recently found some helpful explanations on Education Vibes that clearly describe the structure and requirements, which can be useful for students researching medical study options abroad.
مسار راه منصة أساسية فالتعليم فالمغرب، كتسهّل على التلاميذ والآباء تتبع النقط والنتائج بكل شفافية. مع Massar Service وMoutamadris، الولوج للمعلومات المدرسية ولى بسيط وسريع بلا تعقيد.
Farewell Messages offers thoughtful ideas for colleagues moving on. It’s a must-read before writing a farewell card for coworker, online farewell card, or farewell card template. You can craft heartfelt we will miss you cards, farewell cards, goodbye cards, leaving cards, or group leaving cards that truly celebrate teamwork.