Powder Brake Dynamometers (PB Series)

Powder Brake Dynamometer

Product Description

The Powder Brake Dynamometer (PB Series) contains, as its name suggests, a magnetic powder. The electrical current passing through the coil generates a magnetic field, which changes the property of the powder, thus producing a smooth braking torque through friction. They are ideal for applications operating in the low to middle speed range or when operating in the middle to high torque range. Like Hysteresis Brakes, Powder Brakes provide full torque at zero speed. Like the Eddy-Current Brake Dynamometers, the PB series are water-cooled, allowing for power ratings up to 48 kW. The PB Dynamometers have accuracy ratings of ± 0.3% to 0.5% full scale (± 2% for PB 2.7), depending on size and system configuration. Additional mounting possibilities include speed pickup and OEM version IS.


ModelRated Torque
Rated Torque
Rated Speed
Rated Power
Max. Speed
1 PB 2.7-80.6 N·m84 oz·in3200.023000S pdf | DG pdf
2 PB 2.7-81.2 N·m169 oz·in3200.043000S pdf | DG pdf
4 PB 2.7-82.4 N·m339 oz·in3200.083000S pdf | DG pdf
1 PB 2.7-8K0.6 N·m84 oz·in23900.1510,000S pdf
2 PB 2.7-8K1.2 N·m169 oz·in23900.3010,000S pdf
4 PB 2.7-8K2.4 N·m339 oz·in23900.6010,000S pdf
1 PB 435 N·m44 lb·in9550.504000IS pdf | DG pdf
2 PB 4310 N·m88 lb·in9551.004000IS pdf | DG pdf
1 PB 6525 N·m221 lb·in5701.503000S pdf | IS pdf | DG pdf
2 PB 6550 N·m442 lb·in5703.003000S pdf | IS pdf | DG pdf
1 PB 115100 N·m73 lb·ft4805.003000S pdf | IS pdf | DG pdf
2 PB 115200 N·m147 lb·ft48010.003000S pdf | IS pdf | DG pdf
1 PB 15300 N·m221 lb·ft38212.002000S pdf | IS pdf | DG pdf
2 PB 15600 N·m442 lb·ft38224.002000S pdf | IS pdf | DG pdf
4 PB 151200 N·m885 lb·ft38248.002000S pdf | IS pdf | DG pdf

Key to PDF Drawing Abbreviations

CodeDynamometer Option
SStandard Dynamometer
HSHigh Speed (WB Series only)
ISIndustrial Version
MBMechanical Rotor Blocking Device (WB Series only)
DGSpeed pickup (PB Series only)

Dynamometer Measuring Range


  • Motors:
    • Combustion engine (automotive, motorcycle, chainsaw, etc.)
    • Hybrid
    • Electric
    • Hydraulic (Aerospace, machinery)
  • Pumps (hydraulic, oil)
  • Propeller (Aerospace, marine, helicopter)
  • Automobile industry, torque measurement on labor and/or production (Formula 1, screen wiper, electrical windows, starter, generator, brake)
  • Reduction gear, gearboxes
  • Clutch, overload clutch
  • Motorized valve drill, pneumatic tools
  • Other machine tools

Model 1WB65 Dynamometer Testing Chainsaw

High acceleration of two stroke engine measurement with special coupling to decrease vibrations.

Model 2PB65-G Dynamometer Testing Starter for Combustion Engine

The dynamometer simulates the car engine for the starter test. The bell is used for measuring the torque coming from the initial rotation of the starter, limiting the inertia of the dynamometer.

System Options

To help you select the components for your motor testing system, this table shows which (currently available) electronics and software support Magtrol’s different types of dynamometers.

ModelDescriptionHysteresis Dynamometers (including ED Series)Eddy-current DynamometersPowder Brake DynamometersDial Weight Dynamometers
DSP7000High-Speed Programmable Dynamometer Controller
6200Dynamometer Controller/Readout
TSC 401Torque/Speed Conditioner
5500Dynamometer Switch Box
5501Dynamometer Switch Box
M-TEST 7Motor Testing Software
DES 410/411Power Supply
5241Power AmplifierRequired for HD-825 Only
5200Power Supply
5210Current-Regulated Power Supply
5250Current-Regulated Power Supply
TABDynamometer Tables
AMFAdjustable Motor Fixtures
FMFFixed Motor Fixtures
PTT-Slot Base Plate
FRSFree-Run Speed Sensor
SBB 14Signal Breakout Box


Tandem Dynamometers

1 PB 43 + 2 WB 43 mounted in tandem with 3/4 hp single-phase motor and coupling



WB/PB 43 Seriespdf
WB/PB 65 Seriespdf
1–2 WB 65 + K + 1–2 PB 65pdf
2 WB 65 + MK + 2 WB 65pdf
WB/PB 115 Seriespdf
2 WB 115 + K + 2 WB 115pdf
WB/PB 15 Seriespdf


Dynamometer Selection

Magtrol Dynamometers cover a wide range of Torque, Speed and Mechanical Power ratings. To select the appropriate size Dynamometer for your motor testing needs, you will need to determine the Maximum Torque, Speed and Power applied to the Dynamometer:

Maximum Torque

It is important to consider all torque points that are to be tested, not only rated torque, but also Locked Rotor and Breakdown Torque. Dynamometer selection should initially be based on the maximum torque requirement, subject to determining the maximum power requirements.

Maximum Speed

This rating is to be considered independent of torque and power requirements, and is the maximum speed at which the Dynamometer can be safely run under free run or lightly loaded conditions. It is not to be considered as the maximum speed at which full braking torque can be applied.

Maximum Power Ratings

These ratings represent the maximum capability of the Dynamometer Braking System to absorb and dissipate heat generated when applying a braking load to the motor under test. The power absorbed and the heat generated by the Dynamometer is a function of the Torque (T) applied to the motor under test, and the resulting speed (n) of the motor. This is expressed in these power (P) formulas:

SI:P (watts)=T (N·m)xn (rpm)x(1.047 × 10-1)
English:P (watts)=T (lb·in)xn (rpm)x(1.183 × 10-2)
Metric:P (watts)=T (kg·cm)xn (rpm)x(1.027 × 10-2)
All of Magtrol's controllers, readouts and software calculate horsepower
as defined by 1 hp = 550 lb·ft / s. Using this definition:
hp=P (watts)/745.7
To calculate power, use Magtrol's online motor power calculator

The Dynamometer’s ability to dissipate heat is a function of how long a load will be applied. For this reason, the Maximum Power ratings given are based on continuous operation under load, as well as a maximum of 5 minutes under load.

To safely dissipate heat and avoid Dynamometer failure, the maximum power rating
is the most important consideration in selecting a Dynamometer.