Stepper Motor Replace in Pointer Gauges

The world is digital today, and most information is represented in numbers. However, human nature is more “analog” and better represented in an old-fashioned way, using pointer gauges and bar graphs. Pointer gauges can be found in many applications. Automobiles, trains, and even modern aircraft dashboards. It does not look like good old pointer gauges will disappear in the near future.


An efficient way to control a pointer gauge is to use a stepper motor. A stepper motor is an electromechanical device that converts electrical pulses into discrete mechanical movements. The shaft or spindle of a stepper motor rotates in discrete step increments when electrical command pulses are applied to it in the proper sequence. The motor’s rotation has several direct relationships to these applied input pulses. The sequence of the applied pulses is directly related to the direction of motor shafts rotation. The speed of the motor shafts rotation is directly related to the frequency of the input pulses.


Advantages of using stepper motors   

  • The motor has full torque at standstill (if the windings are energized).
  • Precise positioning and repeatability of movement since good stepper motors have an accuracy of 3 – 5% of a step and this error is noncumulative from one step to the next.
  • Excellent responsiveness to starting/stopping/reversing.
  • The motor’s response to digital input pulses provides open-loop control, making the motor simpler and less costly to control.
  • It is possible to achieve very low-speed synchronous rotation with a load that is directly coupled to the shaft.
  • A wide range of rotational speeds can be realized since speed is proportional to the frequency of the input pulses.


A perfect way to control a pointer gauge is to use a small stepper motor specially designed for pointer control. Today, many companies provide stepper motors for gauges which quality varies greatly. SA1077-1 stepper motor is among the first class quality level. And it is an optimal choice for OE replacement, it works just like the original.


SA1077-1 goes exclusively for BMW 7 series / F01 / F02 / F03 / F04 / F07 / F08 / F10 / F11, GT. It is mainly used in dashboard or instrument cluster or some other digital indicator equipment to transfer a digital signal into an accurate analog display. The metal shaft is 8mm long.


Advantages are as follows,

  • High precision in positioning and indication
  • Small & stable hysteresis, minimized position error.
  • Low noise
  • High-temperature capacity
  • High accuracy internal stopper design, internal reset supported
  • Perform smooth movement under micro-stepping control.


SACER Ltd, established in 2007, is dedicated to developing and producing electronic control modules products for automobile aftermarket, covers a total application area of instrument LCD display, ABS/ECU/repair spare parts, DC motor for the throttle body and automobile semiconductors, etc. And an ODM category of turbo actuator, contactless TPS sensor, ECU, window regulator, EPS/EHPS control board and air flow meter, etc. which requires products with highest stable quality and consistent performance to stand out from the fierce market competition. To learn more about SACER and find out what you need, please check it out at our online shop,

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The overheat problems for stepper motor


A brief introduction for stepper motor

A stepper motor is used to achieve precise positioning via digital control. The motor operates by accurately synchronizing with the pulse signal output from the controller to the driver. Stepper motors, with their ability to produce high torque at a low speed while minimizing vibration, are ideal for applications requiring quick positioning over a short distance.

Sacer offers a wide range of stepper motor products

DC Motor for throttle body, Adle speed control motor, Door lock motor
Stepper Motor for Instrument cluster, Dashboard
Pointer Motor for Instrument cluster, dashboard.

More knowledge about stepper motor

Stepper motors enable accurate positioning with ease. They are used in various types of equipment for accurate rotation angle and speed control using pulse signals. Stepper motors generate high torque with a compact body, and are ideal for quick acceleration and response. Stepper motors also hold their position at stop, due to their mechanical design. Stepper motor solutions consist of a driver (takes pulse signals in and converts them to motor motion) and a stepper motor. Oriental Motor offers many solutions for a wide variety of applications.
A stepper motor rotates with a fixed step angle, just like the second hand of a clock. This angle is called “basic step angle”

Sacer’s motor has a accurate angle for each product, because we have professional producing team and professional technicians to check. Each checking and re-checking means a responsibility to us. Sacer knows how important for a car. After a brief introduction for stepper motor, we will introduce some common issues and solutions for stepper motor, hoping that we help you to solve the problems.

Overheating problems of stepper motor

The main topic for this article is the overheat problems for stepper motor. Honestly, it is a common problem for most of us. But it is actually a normal problem for stepper motor, the problem is that how it counts a normal situation about the overheating problems. How could we reduce the overheat problems using some skills? That’s important for us. it is also a problem we are really caring.

As far as various stepper motor concerned, The internal parts are consisted by all basic iron core and coils. The coin has its resistance, once connecting well with electricity, there is a wear and tear, which magnitude of the loss is proportional to the square of the current resistance. That’s what we called copper loss. The iron core has its magnetic hysteresis vortex effect, which also bring in iron loss and the iron loss is concerned to the material, electric current, frequency, voltage.
Overheat problems is affected by iron loss and copper loss, bringing about stepper motor’s working efficiency. The overheat problem is a common phenomenon for AC motor.
A reasonable range of temperature for stepper motor
What an overheating ranges permitted, it is decided by the internal insulation rating of the stepper motor, that is to say, Internal insulation performance will be undermined when temperature rising to 130 degree Celsius. So, Only if the temperature is be controlled under 130 degree Celsius, All is well. The surface of the temperature is only under 90 Celsius. Driver can use the thermometer to measure it. Or touch it using hands with 1-2 seconds.
Normally, the overheat problem doesn’t affect the service life of stepper motor, But, It will increase the risk of losing control if the temperature is too high, which is very dangerous.
At last, Editor will recommend a stepper motor for BMW.It applies in instrument cluster or dashboard. The angle and the shaft length has been well controlled, the technicians of Sacer has checked rechecked again and again , testing and re-testing time and time. So it is 100% of accurate for customers. Please contact our sale team if you need more detail information.

SA1076 – STEPPER MOTOR for BMW E38/39 X5,BMW 3,7, Rand Rover
Application: Stepper Motor for BMW E38/39 X5, BMW 3, 7, Rand Rover
Make/Model: BMW E38 / E39 / X5 / 3 series / 7 series, Rand Rover
Exception: Metal shaft, soldering needed, refreshed


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