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# What is the motor torque constant?

## What is the motor torque constant?

The Torque Constant defines the torque-current relationship of a motor and is in Nm/amp. The motor and torque constants are related by the formula Km = Kt(trap)/sqrt(R), where R is the phase-to-phase resistance of the winding.

What is torque constant of a DC motor?

The torque constant, kT, is specific to motor’s design, including its magnetic strength, number of wire turns, and armature length. The slope of the motor’s torque-current curve is determined by the torque constant. The back EMF constant, kE, represents the relationship between the motor’s back EMF and its speed.

How is torque constant calculated?

To calculate the Torque Constant read the current draw at a given torque on the Typical Performance Characteristics graph. Now divide the torque by the current. To calculate the Motor Voltage Constant read the no-load speed (rpm) and convert it to radians per second.

### How do you keep torque constant?

In order to keep a constant torque, which is directly related to current, the voltage going from the VFD to the motor is increased as the speed increases. On a 460 Volt motor, 460 Volts is only applied to the motor when the speed reaches 60 Hz.

How do you increase the torque of a DC motor?

Any DC motor will experience a decrease in speed when a load is applied, which causes the back EMF to decrease. The reduction in back EMF increases the net voltage, since the supply voltage remains constant. The net voltage increase causes the armature current to increase, which increases the motor torque.

How do you control motor torque?

To control DC motors torque, a DC drive will regulate armature current. The armature voltage is unregulated allowing the motor to operate at whatever speed is necessary to achieve the set current /torque level.

#### What are the characteristics of a Mashima motor?

The new Mashima motors (40323 &40324) have the same great features as our original motors. They have excellent torque, power and low speed characteristics. They are great for narrow gauge locos, N-Scale and many other applications where smaller size is important. All motors are rated @ 12 VDC (Conversion Factor 1 mm X .04 = inches)

How to calculate the torque constant of a brushless motor?

Both DC brush type and Brushless motors exhibit this linear performance curve relationship. Without getting into theoretical detail, Kt is simply the slope of the torque / current curve of a motor. The units of the constant are found in torque units per amp. (e.g. N-m/amp, oz-in/amp, etc.) Kt can be useful in both design and application.

How much does a Mashima tower car cost?

The price of Mashima motors is currently £25.00. We are offering the following multibuy deals though to those who purchase reasonable quantities of these superb motors: Our Ref Description Cost

## Is the Mashima gearbox suitable for the 10xx series?

Mashima Gearbox suitable for 10xx & 12xx series motors with 33 to 1 Worm and gear. £9.50 MASHIMA MULTI-BUY DEALS The price of Mashima motors is currently £25.00. We are offering the following multibuy deals though to those who purchase reasonable quantities of these superb motors: