Intelligent Digital Stepper Drive

Smoother motion at much higher speeds

The Bell – an intelligent digital servo stepper drive.

Weighs only 1.59 oz (45 g) and supports up to 10 amps continuous current. Its high density allows the drive to deliver a peak of 1000 W of power and 500 W of continuous power

The Bell uses highly accurate modeling and advanced tuning schemes to deliver smoother motion at much higher speeds than conventional stepper drives. The Bell can drive steppers with a wide range of feedback methods to achieve extreme bandwidth servo performance. It can also use a load sensor for accurate "beyond the gear" performance.

Developed to meet OEM application requirements, the Bell stepper drive offers a desirable solution providing networking and intelligent programming capabilities while using lower cost stepper motors.

The Bell incorporates Elmo's highly efficient and compact power density design together with the rich feature set of the SimplIQ DSP core motion control technology. The combination of the Bell's programming flexibility, wide variety of feedbacks to close velocity or position loops and CANopen networking capabilities, makes it an ideal, cost effective solution.

Bell Highlights:

Smooth velocity throughout the speed range due to highly accurate motor modeling and dynamic tuning of the key parameters
Anti-resonant, adaptive input filter to eliminate torque loss
Adaptive voltage control for high speed applications, without exceeding the motor's current specifications
Closed loop velocity and position control with digital and analog encoders
Advanced filtering and gain scheduling are available for dynamic performance
Factory calibrated inputs for external analog signals and for analog encoders

Accessories

Bell Evaluation Board

Feature	Units	5/100
Minimum Supply Voltage (VP+)	VDC	11
Nominal Supply Voltage (VP+)	VDC	85
Maximum Supply Voltage (VP+)	VDC	95
Efficiency at Rated Power	%	> 99
Output Voltage	%	> 90% VP (Note: This is the max. amplitude value Ts=50 us)
Continuous Current Limit (Ic)	A	5
Peak Current Limit	A	10
PWM Switching Frequency	kHz	20
Switching Method		Advanced Bipolar or Unipolar PWM
Weight	g (oz)	Approximately 45 g (1.59 oz)
Dimensions	mm (in)	55 x 15 x 58.5 mm (2.165 x 0.591 x 2.303 in)
Mounting Method		Soldered pins
Digital In / Digital Out / Analog In		6 / 2 / 1

Product Catalog Number	Feedbacks Supported


Servo Performance with Stepper Motor, using Enhanced Current Control
Motion Control Modes: Current/Torque - up to 20 kHz sampling rate Velocity - up to 10 kHz sampling rate Position - up to 10 kHz sampling rate Advanced Positioning Motion Control Modes PTP, PT, PVT, ECAM, Follower, Dual Loop Fast event capturing inputs Fast output compare (OC) Motion Commands: Analog, PWM, SW, Pulse & Direction Feedback Options Incremental Encoder - up to 40 Mega-Counts per second Digital Halls - up to 2 kHz Incremental Encoder with Digital Halls for commutation up to 40 Mega-Counts Interpolated Analog Sine/Cosine Encoder-up to 400 KHz Internal Interpolation - up to x4096 Automatic correction of amplitude mismatch, signal offset Analog Halls Auxiliary Encoder inputs (ECAM,follower, etc.) singled-ended, unbuffered The Bell 5 V power supply provides supply voltage (5 V, 200 mA max) for one Encoder/Resolver/Hall Sensor