AGFRC New - 74KG Powerful Torque IP67 Magnetic Waterproof and Dustproof Servo

AGFRC's new high performance digital waterproof superior servo...

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AGFRC New Shape Design A81FHMW 74KG Powerful Torque IP67 Magnetic Waterproof and Dustproof Servo For Large RC Aircraft

Based on the advantages of A81FHM servo, A81FHMW adds IP67 magnetic waterproof function, and the waterproof depth can be as high as 1 meter. It can reliably accompany you in rainy days, muddy roads, streams, snow and other environments. The internal structure is upgraded with a high-efficiency four-poles brushless motor, ultra-sturdy steel gears, and dust-proof metal bearings, which not only improve the product's tightness and crash resistance, but also effectively prevent sand and dust. Believe that the super torque of 74KG can bring crazy extreme challenges to your model.

Features

  • High Performance Digital Waterproof Superior Servo
  • Long Lifespan 4-Poles Brushless Motor
  • Dust Resistant And Splash Proof Metal Four Bearings
  • Magnetic Sensor Waterproof IP67
  • 2S Lipo High Voltage Compatible
  • Extremely Strong Steel Gears
  • Programmable digital circuit
  • Environmentally Friendly Materials
  • Ideal For 1/8 1/10 On-Road, Buggy, Monster Truck, Racing Car, Large Size Plane, Helicopter, UAV, Robot, Robotic Arm And Engine Etc.

Specification - Iterm name: A81FHMW

  • Operating Voltage: 4.8-8.4V
  • Operating speed: 0.190sec/60 @ 4.8V
  • Operating speed: 0.165sec/60 @ 6.0V
  • Operating speed: 0.135sec/60 @ 7.4V
  • Operating speed: 0.125sec/60 @ 8.4V
  • Stall Torque: 45 kg-cm (625 oz-in) @ 4.8V
  • Stall Torque: 55 kg-cm (764 oz-in) @ 6.0V
  • Stall Torque: 65 kg-cm (903 oz-in) @ 7.4V
  • Stall Torque: 74 kg-cm (1028 oz-in) @ 8.4V
  • Gear: Steel
  • Motor: 4-Poles Brushless Motor
  • Size: 40*20*38mm (1.57 x 0.78 x 1.5 in)
  • Weight: 85g
  • Connector Wire: TYU 300 mm / 22AWG

For More Info

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Oct 07, 2021, 06:56 AM
Registered User
what's the real performance gain with 4-poles motor ?
Oct 07, 2021, 10:02 PM
Registered User
The 4-pole motor can bear much higher torque than 2-pole motor in same size, which can meet the requirement for the application request large torque but limit space.
Oct 07, 2021, 10:33 PM
Registered User
Quote:
Originally Posted by AGFRC View Post
The 4-pole motor can bear much higher torque than 2-pole motor in same size
what about servos with more torque than yours that don't use 4-pole motors ?

https://futabausa.com/product/hps-a700/
Oct 09, 2021, 12:49 AM
Registered User
4 pole gives quicker zero starts and direction reversal.
Its like being in a lower gear.
Oct 09, 2021, 03:51 AM
Registered User
That is the 4-pole motor, even it does not mark it.
Oct 10, 2021, 09:05 AM
Registered User
Radikal's Avatar
Quote:
Originally Posted by alicecooper
4 pole gives quicker zero starts and direction reversal.
How much quicker ?
Oct 10, 2021, 09:55 AM
Registered User
Quote:
Originally Posted by Radikal
How much quicker ?
The percentage would depend on a few variables, like armature mass, driven load and pwm frequency, but in general a two pole motor has wider dead zone between poles reducing the torque at certain points in each rotation. A four pole motor has much narrower inter pole dead zones relative to each rotation so for a given mass (and load) it can achieve faster armature transition with more constant torque as a result. That is why it is more pronounced at zero up or in start transitions across zero (reversing) where inertia doesn't help. Constant and startup torque is always higher with four, it's a key reason I/C starter motors are always four pole.
If I had one of these to compare to a two pole equivalent, it would be done with my usual technique, measuring under various loads with a laser and high speed camera. It always reveals all, especially stopping, and braking to reverse at fast PWM transitions.
Oct 10, 2021, 12:11 PM
Registered User
send these servos to Tareq I want to see if they outperform and will last any longer than MKS servos

everything else is pure marketing and bla bla bla...

''Ideal For 1/8 1/10 On-Road, Buggy, Monster Truck, Racing Car, Large Size Plane, Helicopter, UAV, Robot, Robotic Arm And Engine Etc.''

Tareq Alsaadi 3DX Russia 2017 Goblin Black Thunder with KD lipo batteries gold edition (4 min 44 sec)


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