Features WS55-220 is a high performance,cost-effective 3 phase BLDC motor controller.Voltage range is from 20VDC to 50VDC. The controller can drive the DLDC motor with HALL or without HALL. The driver is based on advanced technology and be provided with high speed, high torque, low noise, low vibration, over current protection, overload protection, less phase line. protection, phase line short protection, alarm output, speed signal output. This controller can be used in small equipment, Electric Power Tools, exhaust Fan, Jade grinding machine, Vibrating motor etc. External potentiometer control/external voltage control.With overvoltage protection, over-current protection, locked-rotor protection. Specifications:Rated voltage: 20 to 50 VDC Rated current: 12A Current limiting: 15AMaximum speed: 20000RPM( the specific speed depends on the motor itself and load)Storage temperature: -20℃~+65℃ Usage environment: Avoid direct contact with dust, fumes and corrosive gases Temperature: 0-45℃ Humidity: < 80%, no frost, frost free Shock: 5.9m/S2 Maximum Storage humidity: 0~95%RH Size: Approx. 9.5 x 6 x 3.5cm / 3.74 x 2.36 x 1.38inch Weight: 258g Detail:1.Two modes of speed regulation: External potentiometer: through this potentiometer speed regulation; External voltage: external 10VDC voltage speed regulation; Note: The two speed regulation can not be used simultaneously2. Speed output PG signal: There is a 5v-revolution pulse output between the port and the ground. The output frequency is set to P (Hz), the motor class logarithm is N, and the speed is F (RPM), then the output speed frequency is P=F*N/60. 3. Alarm output ALM signal:There is an 5V alarm pulse output between the port and the ground. 4. Positive inversion function:F/R:Fiddle the toggle switch on the corresponding side, the motor steering direction can be changed. For the toggle switch, the white part is up and down, then twang it up and down. For the toggle switch, the white part is horizontal, and the twang horizontally. Package included:1 x Motor Driver Controller with cable Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List