Why do some electric wheelchairs move laggingly? Brushless Motor Controller Explanation
Why do some electric wheelchairs move laggingly?
Why is it that for the same brushless motor, some brushless motor controllers respond much better, and are smoother and less slippery when going up an incline, but some are suffocating or even leaning backward? But can you go up an incline while being light?
Reason: It’s because of the quality of the controller. All electric wheelchairs designed with brushless motors must use an amplifier and a motor frequency processor, that is, a controller, to drive the brushless motor. This lower control is the most important part of speed, response and directivity.
PG Drive Technology’s BLDC VR2 (Brushless DC Motor Controller)
As can be seen in the picture above, the motor plug-in cable in the lower control of BLDC VR2 Motor 1(M1), Motor 2 (M2) has subdivisions A, B, and C, which are actually the sensors that control the speed of the motor. If the down-control processing is fast enough and the switching between A, B, and C is smooth, the use of the electric wheelchair will be smoother .
Brushless motor control schematic diagram- Thanks and taken from "Electronic Specifier"
Basically, the lower control is like a computer that decodes and amplifies the information from the upper hand controller and transmits it to the motor. At the same time, there are three Hall sensors in the brushless motor to adjust and feedback the motor speed.
In the brushless motor electric wheelchair, these four electronic parts, battery/motor/upper and lower controllers, have information exchange processing. An electric wheelchair using a brushless motor is like a computer. The upper control is input, the lower control is computer processing, the battery is energy supply, and the motor is output. The main factor that most affects the smoothness, directivity and power is the processing speed of the controller. Whether it is smooth and responsive depends on the controller.
Controller response comparison (test standard 20-degree slope):
Best response series
- The incline is smooth. Once you let go, it will stop and it will go up immediately when you start the incline again.
Response OK series
- Going up the slope is smooth. When you let go, you have to slide back 1-2cm before stopping. When you start on the slope again, you have to wait for a while before going up.
Least recommended series
- If you want to rush up an incline, you can't stop if you let go. You have to wait 1-2cm before stopping. If you start on the incline again, you have to wait for a while before going up.
Our company has selected the most advanced and high-quality products, such as the Quickie Q50R Carbon using the British-made PG Technology BLDC VR2, the American brand Joy Rider made in Taiwan, and the lightest CarbonX .
Unfortunately, the above models are currently not available in China and can only be sold in Hong Kong.
We prefer safety, reliability and durability.
The above videos and descriptions hope to help everyone choose a suitable electric wheelchair and contribute to the Hong Kong industry.
Further reading: Electric wheelchair - brushless motor vs brushed motor
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