The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible.
eBay
433Mhz DC 12V Motor Drive Forwards and Reverse Controller Module Switch RF Wireles Controllers Remote Electric Push Rod Motor
Aliexpress UK
Maximum current: 60A. Forward reversal: support. Fast speed, high efficiency. Support motor: DC brush motor. Small in size, easy to carry.
eBay
40A DC 9-50V Motor Speed Controller 2000W Voltage Regulator Dimming Dimmers Motor Speed Control Thermostat Electronic Module 12V
Aliexpress UK
Power: 750W. Suitable for motors with power not exceeding 750W. Safe to use, using aluminum plate heat sink, DC motor governor has fast heat dissipation, and can prolong the service life. Adjustable Speed Range: 1 to 1800 RPM Adjustable.
eBay
PWM Motor Speed Controller Automatic DC Motor Regulator Control Module Low Voltage DC 1.8V to 15V 2A
Aliexpress UK
[PWM MODULATION] With 0‑100% stepless variable speed, PWM modulation, has wide application range and strong practicality. Speed Regulation Principle: PWM modulation. [OVERLOAD PROTECTION] With overload protection, the will be automatically disconnected if the current is too large, and will be recovered after cooling.
eBay
PWM Motor Speed Controller DC 6V 12V 24V 28V 3A Adjustable Speed DC Motor Driver Forward Reverse Switch
Aliexpress UK
PWM frequency: 13 kHz. The overload and short circuit protecting current is 10A. Duty cycle adjustable: 10%-100%. You will need a suitable adapter to use the item in your country. Certain restrictions apply.
eBay
QIACHIP 433MHz Receiver Wireless Remote Control Switch Motor Controller DC 6V 12V 24V 30V 4 Gangs Relay Module Transmitter Diy
Aliexpress UK
3.2 operation of digital encoder knob. 2.2 rated current: 5A maximum current 15A. 2.2 working frequency: 1KHz~99KHz adjustable, 1KHz step, default frequency of 20KHz, accuracy of about 1%. frequency.The display form of duty cycle lower limit is "L" + two digits, the display form of duty cycle upper limit is "H" + two digits or "100", and the display form of working frequency is "F" + two digits.
eBay
Tuya Smart Wifi Electric Linear Actuator Motor Controller,DC AC 12V 24V 32V 2 Channel Switch,RF433 Remote,2CH Pulse Module Relay
Aliexpress UK
Rated Current: Rated 5A, maximum instantaneous current 15A. The external switch needs to use a self reset button or key, press it once to turn it on, and press it again to turn it off. Motor Starting: Motor soft start function, the current slowly increases when starting the motor, no impact current, effectively protects the motor, and prolongs the service life of the motor.
eBay
Zigbee Smart Electric Actuator Motor Controller,DC 12V 24V AC 220V 2 Channel Switch RF433 Remote,2CH Pulse Module Relay
Aliexpress UK
High switching frequency, up to 60KHZ, which effectively avoids the unpleasantness of debugging motor frequency is low. When driving the motor, the maximum rated current of the module can be up to 60A, and the on-resistance is only 0.003 ohm.
eBay
12V 24V 48V 2000W MAX 10-50V 40A PWM HHO DC Motor Speed Control RC Controller Manufacturer Direct Supply
Aliexpress UK