Eddy-Current Brake Dynamometers (WB Series) are ideal for applications requiring high speeds and also when operating in the middle to high power range. Eddy-Current Brakes provide increasing torque as the speed increases, reaching peak torque at rated speed. The dynamometers have low inertia as a result of small rotor diameter. Brake cooling is provided by a water circulation system, which passes inside the stator to dissipate heat generated by the braking power. The water cooling in the WB provides high continuous power ratings (max. 140 kW). The WB dynamometers have accuracy ratings of ± 0.3% to 0.5% full scale (± 2% for WB 2.7), depending on size and system configuration. Additional options include: high-speed version, speed pickup, mechanical rotor blocking device, OEM version IS and vertical mounting.
- Combustion engine (automotive, motorcycle, chainsaw, etc.)
- 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.
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:
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.
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)||x||n (rpm)||x||(1.047 × 10-1)|
|English:||P (watts)||=||T (lb·in)||x||n (rpm)||x||(1.183 × 10-2)|
|Metric:||P (watts)||=||T (kg·cm)||x||n (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:
|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.