--- product_id: 243132974 title: "RioRand 7-70V 30A PWM DC Motor Speed Controller for Brushed Motors" brand: "riorand" price: "HK$429" currency: HKD in_stock: true reviews_count: 6 category: "Rio Rand" url: https://www.desertcart.hk/products/243132974-riorand-7-70v-30a-pwm-dc-motor-speed-controller-brushed store_origin: HK region: Hong Kong --- # 7-70V wide voltage range High-voltage MOSFET & aluminum heat sink Stepless 1%-100% PWM speed control RioRand 7-70V 30A PWM DC Motor Speed Controller for Brushed Motors **Brand:** riorand **Price:** HK$429 **Availability:** ✅ In Stock ## Summary > ⚙️ Master your motor’s speed with precision and durability — don’t get left behind in the DIY revolution! ## Quick Answers - **What is this?** RioRand 7-70V 30A PWM DC Motor Speed Controller for Brushed Motors by riorand - **How much does it cost?** HK$429 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/243132974-riorand-7-70v-30a-pwm-dc-motor-speed-controller-brushed) ## Best For - riorand enthusiasts ## Why This Product - Trusted riorand brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Accurate Load-Based Voltage Feedback:** Avoid guesswork with precise speed tuning that only true load measurement can deliver—perfect for robotics, pumps, and more. - • **Built to Endure, Designed to Perform:** Heavy-duty MOSFETs and triple 100V capacitors housed in full aluminum keep your controller cool and vibration-free during long runs. - • **Power Your DIY Projects with Precision:** Seamlessly control brushed DC motors from 7 to 70 volts with ultra-smooth 12kHz PWM for whisper-quiet operation. - • **Foolproof Setup for Effortless Customization:** Clear polarity markings, non-polarized motor outputs, and detachable potentiometer make wiring and speed adjustments a breeze. - • **Smart Overcurrent Protection for Peace of Mind:** Integrated fuse guards against surges, ensuring your motor and controller stay safe during intense workloads. ## Overview The RioRand 7-70V 30A PWM DC Motor Speed Controller is engineered for brushed DC motors, offering stepless speed regulation from 1% to 100% with quiet 12kHz PWM operation. Its robust design features high-voltage MOSFETs, triple 100V capacitors, and an aluminum heat sink for low heat and long-term durability. With foolproof wiring, flexible brake control, and built-in overcurrent protection, it’s ideal for DIY electric vehicles, robotics, and small machinery requiring precise, reliable motor speed control. ## Description Brand:RioRandProduct Name :DC Brush Motor Speed Controller DC Controller is required in the following situations:1. Need a wider speed range.2. Need fast dynamic response process.3. Automatic smooth transition is required during acceleration and deceleration.4. High torque is required when low speed operation is required.5. Good excavator characteristics are needed, which can automatically limit the overload current to the set current6.And it is a DC Motor Speed Controller,Not a Voltage Controller Review: Does the job - I got this for my sons little electric tractor. I put a 18v drill battery on a 6v electric tractor. I burnt the first motor out soo got this to hopefully save the motor. 1 year in and its still going strong 💪 Review: Works - I used this to reduce the voltage on a Power Wheels that now operates on a Dewalt 20V Max battery. The board appears to be relatively simple. I am not an experienced electrical technician, but the one feature I would have liked to see was some indication on the dial as to what voltage was being given. In lieu of this, I placed an LCD voltage monitor on the output side and can now monitor the voltage being sent to the motor, but it’s essentially useless as the meter will show high spikes of voltage and then drop, which I suspect is the result of the use of the lithium ion batteries. Nonetheless, when the dial is too low, the motor will not turn, and an adjustment of the dial will adjust in over-voltage, so this piece certainly does work. ## Features - 1.Wide Voltage & Scientific Power Matching — Exclusively designed for brushed DC motors, this 7-70V wide-range controller provides 1%-100% stepless speed regulation with quiet 12kHz PWM operation. It follows precise graded power limits: 12V≤250W, 24V≤350W, 48V≤450W, 60V≤400W. A 5-10V voltage margin is strongly recommended to prevent overload damage, perfect for DIY builds, electric ride-on vehicle mods and small electric devices. - 2.Low Heat & Heavy-Duty Durability — Built with high-voltage MOSFET and three 100V capacitors, paired with a full aluminum heat-dissipating housing to reduce heat buildup and eliminate vibration noise. The stable upgraded circuit supports long continuous runtime for workshop tools, agricultural pumps and marine trolling motors for reliable daily light-duty use. - 3.Accurate Load Voltage Guidance — Solves the most common user misconception: unloaded PWM controllers show input voltage normally. Real adjustable speed and output voltage can only be measured with a loaded brushed motor. Delivers precise tuning for DIY robotics, mini pumps, ventilation fans and small grinding tools. - 4.Foolproof Wiring & Flexible Brake Control — Clearly marked DC input polarity avoids reverse connection damage. Motor outputs are non-polarized for easy rotation reversal. Integrated run/stop/brake switch and 15cm detachable potentiometer allow flexible external panel mounting for all modification projects. - 5.Overcurrent Protection & Smooth Performance — Comes with a spare fuse for reliable overcurrent protection against sudden current surges and burnout. Optimized circuitry ensures ultra-smooth speed transitions and stable operation, ideal for hobbyists and small equipment maintenance. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B071NQ5G71 | | Best Sellers Rank | 131,067 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 575 in Motor Speed Controllers | | Brand | RioRand | | Colour | Green | | Customer Reviews | 4.2 out of 5 stars 4,148 Reviews | | Included Components | NO | | Item Type Name | Motor Speed Controller Switch 30A | | Item Weight | 0.28 Pounds | | Item weight | 0.28 Pounds | | Manufacturer | RioRand | | Manufacturer Part Number | RR-MJLK-FBDG | | Material | Iron | | Model Number | 7-70V PWM DC | | Number of Items | 1 | | UPC | 637012215377 | | Unit Count | 1.0 count | | Unit count | 1.0 count | ## Product Details - **Brand:** RioRand - **Colour:** Green - **Item weight:** 127 g - **Material:** Iron - **UPC:** 637012215377 ## Images ![RioRand 7-70V 30A PWM DC Motor Speed Controller for Brushed Motors - Image 1](https://m.media-amazon.com/images/I/71tU-B63OCL.jpg) ![RioRand 7-70V 30A PWM DC Motor Speed Controller for Brushed Motors - Image 2](https://m.media-amazon.com/images/I/61wf3bdCiwL.jpg) ![RioRand 7-70V 30A PWM DC Motor Speed Controller for Brushed Motors - Image 3](https://m.media-amazon.com/images/I/71ARF66pjPL.jpg) ![RioRand 7-70V 30A PWM DC Motor Speed Controller for Brushed Motors - Image 4](https://m.media-amazon.com/images/I/71fcOS924iL.jpg) ![RioRand 7-70V 30A PWM DC Motor Speed Controller for Brushed Motors - Image 5](https://m.media-amazon.com/images/I/61jQP69zjJL.jpg) ## Questions & Answers **Q: What does p and m mean? If Have 3 dc fans wired in parallel, which ports would be appropriate to install the wires into. And where to install power?** A: Pwm stands for pulse width modulation. It's a way to take the available power from the battery and mange the power delivery to the device. Instead of the battery discharging at 100% rate, the power is being sent out in on/off pulses. This reduces the battery drain. The frequency of the pulses is selected by the user when turning the control knob. Some devices will work well with this (dc electric motors with this unit) and others may not. The benefits of this are: (1) Battery efficiency - This scheme is commonly used for motors powered by batteries to achieve significant improvements in battery life. I use mine (50 amp version) to run my older trolling motor. My batteries can last even double the amount of time by dialing back the knob so that I'm sending out a smaller percentage of the power than 100%. So, for example, if I chose to have the control set to 40% of max I would achieve a significant improvement in battery life. This also means that the motor would run slower. There is a trade off in performance, but it heavily favors battery efficiency. The way I use it, is with a voltage meter readout to observe it's performance. I've been able to deduce that the most efficient gear to use on my trolling motor is the fastest gear. Once I know that, I turn the dial to achieve the speed I want to go instead of achieving the same speed in a less efficient gear. I watch the battery meter to observe how fast the battery draw down is happening over time and choose a top speed that I'm willing to live with as a trade off of power versus battery life. Why this works is because batteries are most efficient when the discharge rate is the slowest. If I'm maxing the battery discharge rate, I'm reducing the battery run time. There is a sweet spot where the battery is happy and the speed is acceptable. (2) Infinite variable speed. This offers variable speed to a motor that only has one speed or several geared speeds. If you couldn't quite hit the right trolling speed in a fixed gear, you can nail the speed with this variable speed control. (3) Some units also have polarity reversal, which means that I can flip that switch and the motor will go in reverse. If a person fashioned a remote steering system for the trolling motor, the trolling motor tiller handle wouldn't have to be touched. It could operate remotely from another location in the boat. Some newer motors have this feature built in, so this device wouldn't have any benefit. A different application would be to have a 12 volt power supply and a 12 volt motor (old treadmills can sometimes have the motors). Hook up the 12 volt motor to a drill press, lathe, bandsaw, etc. and the device would now achieve variable speed. This is really useful for these tools. In the case of a bandsaw, a typical woodworking bandsaw witht the right blade can run slow enough to cut metal. The simpler way to have this effect for those tools would be to get an AC version of the pwm. This would still work, but would be more ideal for someone willing to retrofit the tool. It would be good for alternative energy users (solar, wind, battery banks). **Q: How many wires come from the potentionmeter and can you add on to them?** A: 3 wires. tiny voltage divider... this is all based on a 555 circuit driving 3 mosfets in parallel. **Q: Will this work with 2 power wheel motors?** A: As long as the power wheels motors are within its voltage range, yes. Just be careful not to feed them more voltage than they are rated for, or use a power supply whose voltage is matched to the spec of the motors **Q: ¿nesecito para regular pulidoras cual es recomendable?** A: Este aparato es muy servisial y creo que si lo puedes usar en las pulidora rregula la belosidad ## Customer Reviews ### ⭐⭐⭐⭐⭐ Does the job *by R***Y on 19 October 2025* I got this for my sons little electric tractor. I put a 18v drill battery on a 6v electric tractor. I burnt the first motor out soo got this to hopefully save the motor. 1 year in and its still going strong 💪 ### ⭐⭐⭐⭐⭐ Works *by B***. on 29 June 2024* I used this to reduce the voltage on a Power Wheels that now operates on a Dewalt 20V Max battery. The board appears to be relatively simple. I am not an experienced electrical technician, but the one feature I would have liked to see was some indication on the dial as to what voltage was being given. In lieu of this, I placed an LCD voltage monitor on the output side and can now monitor the voltage being sent to the motor, but it’s essentially useless as the meter will show high spikes of voltage and then drop, which I suspect is the result of the use of the lithium ion batteries. Nonetheless, when the dial is too low, the motor will not turn, and an adjustment of the dial will adjust in over-voltage, so this piece certainly does work. ### ⭐⭐⭐⭐⭐ This thing is a BEAST!! I go over it's rated specs and it still works perfectly. *by E***1 on 13 July 2022* I've pushed this one really hard testing it ... Once my setup stopped and I thought this had broken but in the end it was some WIRING issue that caused the problem. It's a beast - if you're powering a BRUSHED motor this is a fantastic ESC for it. And I mean ANY portable motor - I use this for DC 775, 895 and 890 motors at full speed, and over voltage. I don't think bigger handheld motors exist. I can run it 30 Volts / 10 amps flowing from the power supply, nonstop for hours at a time and the motor needs servicing when this does not. Well done folks! ## Frequently Bought Together - RioRand 7-70V PWM DC Motor Speed Controller Switch 30A - Digital Low Voltage Protector Disconnect Switch Cut Off 12V Over-Discharge Protection Module for 12-36V Lead Acid Lithium Battery Low Voltage Cutoff for Solar Panel Lighting System Camper - for Power Wheel Adapter Compatible with Dewalt 20V Battery Converter Kit with Switch & Fuse & Wire Terminals & 12 AWG Wire for DIY RC Car Toys Robotics --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hk/products/243132974-riorand-7-70v-30a-pwm-dc-motor-speed-controller-brushed](https://www.desertcart.hk/products/243132974-riorand-7-70v-30a-pwm-dc-motor-speed-controller-brushed) --- *Product available on Desertcart Hong Kong* *Store origin: HK* *Last updated: 2026-08-08*